JP2004324240A

JP2004324240A - Construction method for extension continuous footing

Info

Publication number: JP2004324240A
Application number: JP2003120922A
Authority: JP
Inventors: Kikuichi Sato; 菊一佐藤; Toshihiro Horie; 寿弘堀江; Katsushige Manabe; 勝重真鍋
Original assignee: Sekisui House Ltd
Current assignee: Sekisui House Ltd
Priority date: 2003-04-25
Filing date: 2003-04-25
Publication date: 2004-11-18
Anticipated expiration: 2023-04-25
Also published as: JP4244301B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for an extension continuous footing for constructing a new extension continuous footing capable of securing sufficient strength and rigidity and unification without chipping an existing continuous footing on an existing continuous footing without a structure for future extension. <P>SOLUTION: In this construction method for the extension continuous footing for constructing the extension continuous footing 2 of a new building adjacent to the continuous footing 1 of an existing building, the new extension continuous footing 2 adjacent to the outer surface 3 of the continuous footing 1 of the existing building is fixedly fitted to the outer surface 3 so as to be formed integrally with each other. In addition, the new extension continuous footing 2 including the new extension continuous footing 2 is constructed to be closed continuously and formed integrally with each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、建築物の増設布基礎工法に係り、詳しくは、連続一体に閉じた増設布基礎を既存布基礎の外側面に隣接して構築する増設布基礎工法に関するものである。
【０００２】
【従来の技術】
既存建築物に新たな建築物を構築する際、図６に示すように、既存建築物の既存布基礎１０１と新たに構築する平面視でコの字型の増設布基礎１０２とを連結する。この場合、図７に示すように、既存布基礎１０１に差し筋アンカー１０３を打ち込み、増設側の鉄筋１０４と重ね継ぎ手を行う施工方法が用いられる（例えば、特許文献１参照）。
【０００３】
また、既存建築物に新たな建築物を構築する場合に備えて予め既存布基礎の外側面に接続部材を埋設する施工方法も用いられる。この場合、既存布基礎の鉄筋の端部に接続された高ナットが既存布基礎の外側面に埋設され、該高ナットに増設側の鉄筋を接続し平面視でコの字型の増設布基礎を構築する（例えば、特許文献２参照）。
【０００４】
また、図８に示すように、既存布基礎１０１のはつる部分を少なくし、平面視でロの字型の新たな増設布基礎１０５を構築する施工方法も用いられる。この場合、図９に示すように、既存布基礎１０１の斜線部１０６をはつり落とし、既存布基礎１０１のベース鉄筋１０７の上に増設側の立ち上り鉄筋１０８を載置する。既存布基礎１０１のはつり面にホールインアンカーや寸切ボルト等の連結部材１０９を打ち込む。その後、該連結部材１０９に金具を用いて型枠を設置し、増設布基礎１０５を構築する。
【０００５】
【特許文献１】
特開２０００−１４５１６４号公報（第１−３頁、図４−図９）
【特許文献２】
特開２０００−２４８５５７号公報（第５−９頁、図６−図８）
【０００６】
【発明が解決しようとする課題】
しかしながら、上記従来の平面視でコの字型の増設布基礎１０２を差し筋アンカー１０３を打ち込み構築する施工方法においては、既存布基礎１０１と増設布基礎１０２との連結部は簡易な固定面となっており、既存布基礎１０１と増設布基礎１０２との連続一体性が殆ど考慮されていない。つまり、増設布基礎１０２が既存布基礎１０１と密着固定されず、既存布基礎１０１と連続一体に閉じていないので、風や地震等による水平力により作用する転倒モーメント等に対して充分な強度及び剛性が確保できず、増設布基礎１０２に浮き上がりや水平移動等の不具合が生じるおそれがあった。
【０００７】
また、上記従来の予め既存布基礎の外側面に接続部材を埋設する施工方法においては、将来の増設を見越し接続部材を埋設した既存布基礎に対してのみ有効な施工方法であり、それ以外の既存布基礎に対して増設布基礎を連結することはできなかった。
【０００８】
また、上記従来の既存布基礎１０１のはつる部分を少なくして平面視でロの字型の増設布基礎１０５を構築する施工方法においては、はつる部分を少なくしてはいるが、現場で既存布基礎１０１をはつる必要がある。そのため、騒音や粉塵等の発生により住人が居住したまま施工作業を行うことができなかった。また、はつる際に、既存布基礎１０１のベース鉄筋１０７等を傷つけたり、既存建築物に悪影響を及ぼすことがあった。
【０００９】
本発明は、上記した事情や問題に鑑みてなされたものであり、予め増設に備えた構造を具備しない既存布基礎に対して、既存布基礎をはつることなく充分な強度と剛性を確保するとともに一体性を確保することができる新たな増設布基礎を構築する増設布基礎工法を提供することを目的とする。
【００１０】
上記目的を達成するために、請求項１記載の増設布基礎工法は、既存建築物の布基礎に隣接して新たな建築物の増設布基礎を構築する増設布基礎工法において、前記既存建築物の布基礎の外側面に隣接する新たな増設布基礎を当該外側面と密着固定して一体となるように構築し、更に当該新たな増設布基礎を含む連続一体に閉じた新たな増設布基礎を構築することを特徴としている。
【００１１】
請求項２記載の増設布基礎工法は、請求項１に記載の増設布基礎工法において、前記既存建築物の布基礎の外側面に隣接する新たな増設布基礎を当該外側面と密着固定して一体となるように構築する工法が、該外側面に前記新たな増設布基礎を密着固定するための連結部材を打ち込み、該連結部材に鉄筋受金具を取付け、該鉄筋受金具で格子状鉄筋を支持するとともに前記外側面と所定距離を開けて型枠を支持した後、当該外側面と当該型枠との間にコンクリートモルタルを打設して形成する工法であることを特徴としている。
【００１２】
請求項３記載の増設布基礎工法は、請求項２に記載の増設布基礎工法において、前記連結部材がホールインアンカーとボルトであることを特徴としている。
【００１３】
請求項４記載の増設布基礎工法は、請求項２又は３に記載の増設布基礎工法において、前記鉄筋受金具が、前記連結部材に取付けられる連結部材取付片と、該連結部材取付片の端部から前記外側面と反対方向へ直角方向に延出した前記格子状鉄筋を支持する鉄筋載置片と、該鉄筋載置片の端部から前記連結部材取付片と反対方向へ直角方向に延出し前記外側面と所定距離を開けて前記型枠を支持するための型枠受金具を取付ける型枠受金具取付片と、からなることを特徴としている。
【００１４】
【発明の実施の形態】
以下、本発明の実施の形態に係る増設布基礎工法について、図面に基づいて説明する。該増設布基礎工法は、図１に示すように、既存布基礎１の外側面３に隣接させ連続一体に閉じた新たな増設布基礎２を構築する工法である。
【００１５】
既存布基礎１の増設側のベース部分の根伐り、底均、遣方等の準備作業の後、図２に示すように、既存布基礎１の立ち上がり部の外側面３にホールインアンカー４を所定の間隔で打ち込み埋設する。該ホールインアンカー４にそれぞれ長寸のボルト５を取付ける。ホールインアンカー４とボルト５とが、既存布基礎１と増設布基礎２との連結部材となる。
【００１６】
なお、前記ボルト５をホールインアンカー４に取付けるとき、図２および図３に示すように、所定のボルト５には予めナット６と鉄筋受金具７とを仮取付けする。該鉄筋受金具７は、一片の金属板からなり孔開け加工及び折曲げ加工により形成される。鉄筋受金具７は、図４に示すように、前記ボルト５に取付けられる連結部材取付片７１と、該連結部材取付片７１の端部から既存布基礎１の外側面３と反対方向へ直角方向に延出した鉄筋載置片７２と、該鉄筋載置片７２の端部から連結部材取付片７１と反対方向へ直角方向に延出した型枠受金具取付片７３とからなる。連結部材取付片７１にはボルト５を挿通するための長孔７４が貫設され、型枠受金具取付片７３には孔７５が貫設される。
【００１７】
既存布基礎１に隣接する増設布基礎２の骨組となる格子状鉄筋１１を、前記鉄筋載置片７２に載置し支持する。格子状鉄筋１１を所定高さに設置するため、該格子状鉄筋１１が載置される鉄筋載置片７２の上面が既存布基礎１の基準天端面から所定の高さ位置となるように、前記鉄筋受金具７の取付け高さを長孔７４により調節し、連結部材取付片７１を既存布基礎１の外側面３に接面させ、前記ナット６により鉄筋受金具７を前記ボルト５に取付ける。既存布基礎１に隣接しない増設布基礎２の骨組となる格子状鉄筋１２、および格子状鉄筋１１と格子状鉄筋１２とを連結し補強するＬ字状やＵ字状の補強鉄筋１３を、図３に示すように設置する。格子状鉄筋１２が既存布基礎１のベース部と干渉する場合には、格子状鉄筋１２を切断し干渉を避ける。
【００１８】
配筋後もしくは配筋前に、前記鉄筋受金具７に型枠受金具８を取付ける。該型枠受金具８は、図５に示すように、雄ねじが形成された長寸の丸棒８１と、該丸棒８１の端面に固着する型枠受部８２とからなる。丸棒８１にナット９を１つ仮取付けした後、鉄筋受金具７の型枠受金具取付片７３の孔７５に、型枠受金具８の丸棒８１を挿通する。型枠受部８２は、既存布基礎１に隣接する増設布基礎２のためのメタルフォームからなる型枠１４の下側面を支持するため、上側が開口したコの字型の断面を有する。なお、型枠受部８２の断面は、図５に示すように、上側および下側が開口したＨ字型でもよい。支持する型枠１４と既存布基礎１の外側面３とのなす距離が、所望の増設布基礎２の厚みとなるように調整した後、型枠受金具取付片７３の両側から前記ナット９と新たなナット９とにより固定し、鉄筋受金具７に型枠受金具８を取付ける。なお、型枠１４の重量により鉄筋受金具７が変形し、型枠受金具８の設置位置が所定位置から下がることを防止するために、例えば図２に示すように、鉄筋受金具７の下側にモルタル１０を敷き込む。また、鉄筋受金具７と既存布基礎１のベース部との間に支持棒を入れて、もしくは鉄筋受金具７をボルト５を介して針金等により拘束して、鉄筋受金具７を支持することにより型枠受金具８の下がりを防止してもよい。
【００１９】
なお、型枠１４を支持する手段は、鉄筋受金具７に取付けた型枠受金具８によることに限定されず、既存布基礎１の外側面３と所定距離を開けて型枠１４を支持することができる手段であればよい。例えば、鉄筋受金具７の型枠受金具取付片７３の端部から連結部材取付片７１と反対方向へ直角方向に延出する型枠受片を設け、該型枠受片の上面に型枠１４を支持するための平行な突起片を設け、型枠１４を支持してもよい。
【００２０】
型枠受金具８の型枠受部８２により型枠１４を支持し設置するとともに、既存布基礎１に隣接しない増設布基礎２のための型枠を設置し、これら型枠の中にコンクリートモルタルを打設して増設布基礎２を形成する。なお、錆を防ぐためにコンクリートモルタルと直接接触しないよう、露出する前記ボルト５のねじ部にビニールテープを巻き付ける。また、既存布基礎１の外側面３に隣接する増設布基礎２の天端レベルが、既存布基礎１の天端から１００ｍｍ程低くなるように施工すれば、納まりがよい。
【００２１】
以上説明したように、本実施の形態の増設布基礎工法によれば、連続一体に閉じた新たな増設布基礎２を構築する。よって、増設布基礎２が連続一体に閉じているので、風や地震等による水平力により作用する転倒モーメント等に対して充分な強度及び剛性を確保でき、増設用布基礎２に浮き上がりや水平移動等の不具合が生じるおそれを解消することができる。なお、連続一体に閉じた新たな増設布基礎２は、図１に示すような、既存布基礎１の外側面３に隣接させ構築した新たな増設布基礎を一辺とする平面視でロの字型の新たな増接布基礎に限定されない。既存布基礎１の外側面３に隣接させ構築した新たな増設布基礎を含む連続一体に閉じた新たな増設布基礎２であればよく、例えば、平面視で隅部に斜部や凹部を有する新たな増設布基礎を構築してもよい。
【００２２】
また、連続一体に閉じた新たな増設布基礎２を既存布基礎１の外側面３に隣接させ構築するので、既存布基礎１をはつることなく増設布基礎２を構築することができる。よって、騒音や粉塵等の発生を防止できるため住人が居住したまま施工を行うことができ、基礎工事中に外壁や床の解体を必要とせず内装に影響を与えないので、施工が簡易化し施工コストを削減できる。また、既存建築物に悪影響を及ぼすことがないとともに、既存布基礎１の鉄筋のはつり出しがないので、顧客に不安を与えないようにすることができる。
【００２３】
また、既存布基礎１の外側面３に連結部材を打ち込み、連続一体に閉じた増設布基礎２を連結し既存布基礎１の外側面３に密着固定する。よって、従来平面視でコの字型の新たな増設布基礎１０２を構築する場合の固定面に比較して固定面が連続しているため広くなり、連結部材を広範囲に渡って設けることができるので、必要強度に応じた所望の連結部材を設置することができる。従って、既存布基礎１と増設布基礎２との固定面に既存布基礎１と同等の強度を与えることができ、既存布基礎１と増設用布基礎２との連続一体性を向上できる。また、既存布基礎１に連結部材を増設時に設けることができるので、既存布基礎１が予め増設に備えた構造を具備する必要がないため、増設可能な既存布基礎１の対象を広げることができる。
【００２４】
また、既存布基礎１の外側面３にホールインアンカー４を打ち込み、それにボルト５を取付けることにより連結部材を構成しているので、所望の位置に連結部材を容易に設けることができ、施工コストを削減できる。
【００２５】
また、連結部材であるボルト５に取付けた鉄筋受金具７が、格子状鉄筋１１を支持する役割と型枠１４を支持する型枠受金具８を取付ける役割とを兼用するので、施工が簡易化し施工コストを削減できる。
【００２６】
【発明の効果】
上記の説明から明らかなように、請求項１の増設布基礎工法によれば、連続一体に閉じた新たな増設布基礎を構築するので、風や地震等による水平力によって作用する転倒モーメント等に対して充分な強度及び剛性を確保でき、新たな増設布基礎に浮き上がりや水平移動等の不具合が生じるおそれを解消することができる。また、新たな増設布基礎を既存建築物の布基礎の外側面に隣接させ構築するので、既存建築物の布基礎をはつる必要がないため、騒音や粉塵等の発生を防止し住人が居住したまま施工を行うことができ、基礎工事中に外壁や床の解体を必要とせず内装に影響を与えないので、施工が簡易化し施工コストを削減できる。また、既存建築物に悪影響を及ぼすことがないとともに、既存建築物の布基礎の鉄筋のはつり出しがないので、顧客に不安を与えないようにすることができる。さらに、既存建築物の布基礎の外側面に隣接する新たな増設布基礎を外側面と密着固定して一体となるように構築するので、既存建築物の布基礎と新たな増設布基礎との連続一体性を確保できる。
【００２７】
請求項２の増設布基礎工法によれば、既存建築物の布基礎の外側面に新たな増設布基礎を密着固定するための連結部材を打ち込み、連続一体に閉じた新たな増設布基礎と連結するので、従来平面視でコの字型の増設布基礎における連結に比べて固定部が連続するため、連結部材を広範囲に渡って設けることができるため、固定部に必要な強度を与えられる。よって、既存建築物の布基礎と新たな増設布基礎との固定部に既存建築物の布基礎と同等の強度を与えることができ、既存建築物の布基礎と新たな増設布基礎との連続一体性を確保できる。また、既存建築物の布基礎に連結部材を増設時に設けることができるので、既存建築物が予め増設に備えた構造を具備する必要がないため、増設可能な既存建築物の対象を広げることができる。また、連結部材に鉄筋受金具を取付け、該鉄筋受金具が格子状鉄筋を支持する役割と型枠を支持する役割とを兼用するので、施工が簡易化し施工コストを削減できる。
【００２８】
請求項３の増設布基礎工法によれば、連結部材がホールインアンカーとボルトであるので、所望の位置に連結部材を容易に設けることができ、施工コストを削減できる。
【００２９】
請求項４の増設布基礎工法によれば、鉄筋受金具が連結部材取付片と鉄筋載置片と型枠受金具取付片とから一体になるので、施工作業を簡易化でき、施工コストを削減できる。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る増設布基礎の設置を説明する図である。
【図２】既存布基礎に格子状鉄筋及び型枠を設置した状態を示す図である。
【図３】増設布基礎工法における配筋を示す図である。
【図４】鉄筋受金具の斜視図である。
【図５】型枠受金具の斜視図である。
【図６】従来例に係る増設布基礎の設置を説明する図である。
【図７】従来例に係る既存布基礎と増設布基礎の鉄筋との連結状態を説明する図である。
【図８】従来例に係る増設布基礎の設置を説明する図である。
【図９】従来例に係る既存布基礎と増設側の鉄筋との連結状態を説明する図である。
【符号の説明】
１既存布基礎
２増設布基礎
３外側面
４ホールインアンカー（連結部材）
５ボルト（連結部材）
６ナット
７鉄筋受金具
８型枠受金具
９ナット
１０モルタル
１１格子状鉄筋
１２格子状鉄筋
１３補強鉄筋
１４型枠[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an extension cloth foundation method for a building, and more particularly, to an extension cloth foundation method for constructing an extension cloth foundation that is continuously and integrally closed adjacent to an outer surface of an existing cloth foundation.
[0002]
[Prior art]
When constructing a new building on the existing building, as shown in FIG. 6, an existing cloth foundation 101 of the existing building is connected to a U-shaped additional cloth foundation 102 in a plan view to be newly constructed. In this case, as shown in FIG. 7, a construction method is used in which a reinforcing bar anchor 103 is driven into the existing fabric foundation 101 and a reinforcing joint 104 is added to the reinforcing bar 104 on the additional side (for example, see Patent Document 1).
[0003]
In addition, a construction method is also used in which a connecting member is buried in advance on the outer surface of an existing cloth foundation in preparation for building a new building on an existing building. In this case, a high nut connected to the end of the reinforcing bar of the existing cloth foundation is buried in the outer surface of the existing cloth foundation, and a reinforcing bar on the extension side is connected to the high nut, and a U-shaped expansion cloth base in plan view is connected. (For example, refer to Patent Document 2).
[0004]
As shown in FIG. 8, a construction method is also used in which the vine portion of the existing cloth foundation 101 is reduced, and a new expanded cloth foundation 105 having a square shape in plan view is constructed. In this case, as shown in FIG. 9, the hatched portion 106 of the existing cloth foundation 101 is stripped off, and the rising reinforcement 108 on the additional side is placed on the base reinforcement 107 of the existing cloth foundation 101. A connecting member 109 such as a hole-in anchor or a small cutting bolt is driven into the hanging surface of the existing cloth foundation 101. Then, a mold is installed on the connecting member 109 using a metal fitting, and the additional fabric base 105 is constructed.
[0005]
[Patent Document 1]
JP-A-2000-145164 (pages 1-3, FIGS. 4 to 9)
[Patent Document 2]
JP-A-2000-248557 (pages 5-9, FIGS. 6-8)
[0006]
[Problems to be solved by the invention]
However, in the above-described conventional construction method in which the U-shaped extension cloth foundation 102 is driven into the U-shaped extension cloth foundation 102 by inserting the reinforcing bar anchor 103, the connecting portion between the existing cloth foundation 101 and the extension cloth foundation 102 has a simple fixing surface. Therefore, little consideration is given to the continuous integrity of the existing cloth foundation 101 and the additional cloth foundation 102. That is, since the additional fabric base 102 is not tightly fixed to the existing fabric base 101 and is not continuously and integrally closed with the existing fabric base 101, the fabric base 102 has sufficient strength and strength against overturning moment or the like that is acted on by horizontal force due to wind or earthquake. Rigidity could not be ensured, and there was a possibility that problems such as lifting and horizontal movement might occur on the additional fabric base 102.
[0007]
Further, in the above-mentioned conventional construction method of burying the connection member on the outer surface of the existing cloth foundation in advance, the construction method is effective only for the existing cloth foundation in which the connection member is buried in anticipation of future expansion. The extension cloth foundation could not be connected to the existing cloth foundation.
[0008]
Further, in the construction method of constructing the conventional cloth foundation 105 having a square shape in plan view by reducing the vine portion of the existing cloth foundation 101, the vine portion is reduced, It is necessary to hang the existing cloth foundation 101. Therefore, the construction work could not be performed while the resident was living due to the generation of noise and dust. In addition, when peeling, the base reinforcing bar 107 and the like of the existing cloth foundation 101 may be damaged, or the existing building may be adversely affected.
[0009]
The present invention has been made in view of the above-described circumstances and problems, and secures sufficient strength and rigidity without attaching an existing cloth foundation to an existing cloth foundation that does not have a structure provided for expansion in advance. It is another object of the present invention to provide an extension cloth foundation method for constructing a new extension cloth foundation capable of securing integrity.
[0010]
In order to achieve the above object, an additional cloth foundation method according to claim 1 is an additional cloth foundation method for constructing an additional cloth foundation of a new building adjacent to a cloth foundation of an existing building. A new extension cloth foundation adjacent to the outer side of the above-mentioned cloth foundation is constructed so as to be integrated with the outer side surface by being tightly fixed thereto and further integrally closed including the new extension cloth foundation. It is characterized by building.
[0011]
The additional cloth foundation method according to claim 2 is the additional cloth foundation method according to claim 1, wherein a new additional cloth foundation adjacent to an outer surface of the cloth foundation of the existing building is tightly fixed to the outer surface. A method of constructing to be integrated is to drive a connecting member for tightly fixing the new additional fabric foundation on the outer side surface, attach a reinforcing bar bracket to the connecting member, and form a lattice reinforcing bar with the reinforcing bar bracket. The method is characterized in that it is a method of supporting and supporting the formwork with a predetermined distance from the outer side surface, and then casting concrete mortar between the outer side surface and the formwork.
[0012]
According to a third aspect of the present invention, in the second aspect, the connecting member is a hole-in anchor and a bolt.
[0013]
According to a fourth aspect of the present invention, there is provided an extension cloth foundation method according to the second or third aspect, wherein the reinforcing bar receiving member is attached to the connection member by a connection member attachment piece and an end of the connection member attachment piece. A reinforcing bar mounting piece supporting the lattice reinforcing bar extending in a direction perpendicular to the outer surface from the portion, and extending in a direction perpendicular to the connecting member mounting piece from an end of the reinforcing bar mounting piece. And a form fitting mounting piece for mounting a form fitting for supporting the form with a predetermined distance from the outer surface.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an extension cloth foundation method according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the additional cloth foundation method is a method of constructing a new additional cloth foundation 2 which is adjacent to the outer surface 3 of the existing cloth foundation 1 and closed continuously and integrally.
[0015]
After preparation work such as root cutting, bottom leveling, and how to use the base portion on the additional side of the existing cloth foundation 1, as shown in FIG. 2, a hole-in anchor 4 is attached to the outer surface 3 of the rising portion of the existing cloth foundation 1. It is implanted at predetermined intervals. A long bolt 5 is attached to each of the hole-in anchors 4. The hole-in anchor 4 and the bolt 5 serve as a connecting member between the existing cloth foundation 1 and the additional cloth foundation 2.
[0016]
When the bolt 5 is attached to the hole-in anchor 4, as shown in FIGS. 2 and 3, a nut 6 and a reinforcing-bar receiving member 7 are temporarily attached to a predetermined bolt 5 in advance. The reinforcing bar receiving member 7 is made of one piece of metal plate, and is formed by drilling and bending. As shown in FIG. 4, a reinforcing member 7 is provided with a connecting member mounting piece 71 mounted on the bolt 5, and a direction perpendicular to a direction opposite to the outer surface 3 of the existing cloth foundation 1 from an end of the connecting member mounting piece 71. And a form fitting attachment piece 73 extending in a direction perpendicular to the direction opposite to the connecting member attachment piece 71 from the end of the reinforcement piece 72. A long hole 74 for inserting the bolt 5 is formed through the connecting member mounting piece 71, and a hole 75 is formed through the form receiving piece mounting piece 73.
[0017]
A lattice-shaped reinforcing bar 11 serving as a skeleton of the additional cloth base 2 adjacent to the existing cloth base 1 is mounted on the reinforcing bar mounting piece 72 and supported. In order to install the grid-shaped reinforcing bar 11 at a predetermined height, the upper surface of the reinforcing bar mounting piece 72 on which the grid-shaped reinforcing bar 11 is mounted is positioned at a predetermined height from the reference top end surface of the existing cloth foundation 1. The mounting height of the reinforcing bar receiving member 7 is adjusted by the elongated hole 74, the connecting member mounting piece 71 is brought into contact with the outer side surface 3 of the existing cloth foundation 1, and the reinforcing bar receiving member 7 is mounted on the bolt 5 by the nut 6. . A lattice reinforcing bar 12 serving as a framework of an additional cloth foundation 2 not adjacent to the existing cloth foundation 1, and an L-shaped or U-shaped reinforcing reinforcing bar 13 for connecting and reinforcing the lattice reinforcing bars 11 and 12 are shown in FIG. Install as shown in 3. When the lattice reinforcing bar 12 interferes with the base portion of the existing cloth foundation 1, the lattice reinforcing bar 12 is cut to avoid the interference.
[0018]
After or before the arrangement of the reinforcing bars, the form fitting 8 is attached to the reinforcing bar 7. As shown in FIG. 5, the form receiving bracket 8 includes a long round bar 81 on which a male screw is formed, and a form receiving portion 82 fixed to an end surface of the round bar 81. After temporarily attaching one nut 9 to the round bar 81, the round bar 81 of the form fitting 8 is inserted into the hole 75 of the form fitting attachment 73 of the reinforcing bar fitting 7. The form receiving portion 82 has a U-shaped cross section with an open upper side to support the lower surface of the form 14 made of metal foam for the additional cloth base 2 adjacent to the existing cloth base 1. In addition, as shown in FIG. 5, the cross section of the form receiving portion 82 may be an H-shape in which upper and lower sides are open. After adjusting the distance between the supporting formwork 14 and the outer surface 3 of the existing cloth foundation 1 so as to have a desired thickness of the additional cloth foundation 2, the nut 9 is attached to both sides of the form receiving bracket mounting piece 73. It is fixed with a new nut 9 and the form fitting 8 is attached to the reinforcing bar fitting 7. In order to prevent the reinforcing metal fitting 7 from being deformed by the weight of the formwork 14 and lowering the installation position of the form fitting 8 from a predetermined position, for example, as shown in FIG. Lay mortar 10 on the side. In addition, a supporting rod is inserted between the reinforcing bar receiving member 7 and the base portion of the existing cloth foundation 1, or the reinforcing bar receiving member 7 is supported by a wire or the like via the bolt 5 to support the reinforcing bar receiving member 7. This may prevent the form fitting 8 from falling.
[0019]
The means for supporting the formwork 14 is not limited to the formwork support 8 attached to the reinforcing bar support 7, but supports the formwork 14 at a predetermined distance from the outer surface 3 of the existing cloth foundation 1. Any means can be used. For example, a form receiving piece extending in a direction perpendicular to a direction opposite to the connecting member attaching piece 71 from an end of the form fitting attaching piece 73 of the reinforcing metal receiving piece 7 is provided, and a form is provided on an upper surface of the form receiving piece. A parallel projecting piece for supporting the mold 14 may be provided to support the formwork 14.
[0020]
The formwork 14 is supported and installed by the formwork receiving portion 82 of the formwork fitting 8, and a formwork for the additional cloth foundation 2 not adjacent to the existing cloth foundation 1 is installed. To form the additional fabric base 2. In order to prevent rust, a vinyl tape is wound around the exposed thread portion of the bolt 5 so as not to come into direct contact with the concrete mortar. In addition, if the construction is performed such that the top end level of the additional cloth foundation 2 adjacent to the outer side surface 3 of the existing cloth foundation 1 is lower than the top end of the existing cloth foundation 1 by about 100 mm, the fitting is good.
[0021]
As described above, according to the extension cloth foundation method of the present embodiment, a new extension cloth foundation 2 that is closed continuously and integrally is constructed. Therefore, since the additional fabric base 2 is continuously and integrally closed, sufficient strength and rigidity can be secured against a falling moment or the like that is applied by a horizontal force due to a wind, an earthquake, or the like. And the like can be eliminated. In addition, the new extension cloth base 2 closed continuously and integrally is, as shown in FIG. 1, in a plan view with the new extension cloth foundation constructed adjacent to the outer side surface 3 of the existing cloth foundation 1 as one side. It is not limited to the new extension cloth foundation of the mold. It is sufficient if the new additional fabric base 2 is continuously and integrally closed including a new additional fabric foundation constructed adjacent to the outer side surface 3 of the existing fabric foundation 1, and has, for example, a slant portion or a concave portion at a corner in plan view. A new extension cloth foundation may be constructed.
[0022]
In addition, since the new additional fabric base 2 which is closed continuously and continuously is constructed adjacent to the outer side surface 3 of the existing fabric foundation 1, the additional fabric foundation 2 can be constructed without attaching the existing fabric foundation 1. Therefore, it is possible to prevent noise and dust from being generated, so that construction can be carried out while residents are occupied.There is no need to dismantle outer walls and floors during foundation work, and there is no impact on interiors. Costs can be reduced. In addition, there is no adverse effect on the existing building, and since the reinforcing bars of the existing cloth foundation 1 are not hung, it is possible to prevent the customer from worrying.
[0023]
Further, a connecting member is driven into the outer surface 3 of the existing cloth foundation 1 to connect the additional cloth foundation 2 which is closed continuously and integrally, and is fixed to the outer surface 3 of the existing cloth foundation 1. Therefore, since the fixing surface is continuous compared with the fixing surface in the case of constructing a new U-shaped additional cloth base 102 in a conventional plan view, the fixing member is wider, and the connecting member can be provided over a wide range. Therefore, a desired connecting member corresponding to the required strength can be installed. Therefore, the same strength as that of the existing cloth foundation 1 can be given to the fixing surface between the existing cloth foundation 1 and the additional cloth foundation 2, and the continuous integrity of the existing cloth foundation 1 and the additional cloth foundation 2 can be improved. In addition, since the connecting member can be provided on the existing cloth foundation 1 at the time of extension, the existing cloth foundation 1 does not need to have a structure provided for the extension in advance, so that the object of the existing cloth foundation 1 that can be extended can be expanded. it can.
[0024]
In addition, since the connecting member is formed by driving the hole-in anchor 4 into the outer side surface 3 of the existing cloth foundation 1 and attaching the bolt 5 thereto, the connecting member can be easily provided at a desired position, and the construction cost is increased. Can be reduced.
[0025]
In addition, the reinforcing metal fitting 7 attached to the bolt 5 serving as the connecting member has both a role of supporting the lattice-shaped reinforcing bar 11 and a function of attaching the form fitting 8 for supporting the formwork 14, thereby simplifying the construction. Construction costs can be reduced.
[0026]
【The invention's effect】
As is clear from the above description, according to the additional cloth foundation method of claim 1, since a new additional cloth foundation that is closed continuously and continuously is constructed, it is possible to reduce the overturning moment or the like that acts due to horizontal force due to wind, earthquake, or the like. On the other hand, sufficient strength and rigidity can be ensured, and it is possible to eliminate the possibility that a problem such as floating or horizontal movement may occur on a new extension cloth foundation. In addition, since a new extension cloth foundation is constructed adjacent to the outer side of the cloth foundation of the existing building, it is not necessary to attach the cloth foundation of the existing building. The construction can be carried out as it is, and there is no need to dismantle the outer walls and floors during the foundation work and it does not affect the interior, so the construction can be simplified and the construction cost can be reduced. In addition, there is no adverse effect on the existing building, and since the reinforcing bars of the cloth foundation of the existing building do not protrude, it is possible to prevent the customer from worrying. Furthermore, a new extension cloth foundation adjacent to the outer side of the existing building's cloth foundation is tightly fixed to the outer side to be integrated, so that the existing building's cloth foundation and the new extension cloth foundation can be integrated. Continuous integrity can be ensured.
[0027]
According to the additional fabric foundation method of claim 2, a connecting member for tightly fixing the new additional fabric foundation is driven into the outer surface of the fabric foundation of the existing building, and connected to the new additional fabric foundation that is closed continuously and integrally. As a result, the fixing portion is continuous compared to the connection in the conventional U-shaped extension cloth foundation in a plan view, so that the connecting member can be provided over a wide range, and the necessary strength can be given to the fixing portion. Therefore, the same strength as the existing building cloth foundation can be given to the fixed portion between the existing building cloth foundation and the new extension cloth foundation, and the continuous connection between the existing building cloth foundation and the new extension cloth foundation Oneness can be secured. In addition, since the connecting member can be provided on the cloth foundation of the existing building at the time of extension, it is not necessary for the existing building to have the structure prepared for the extension in advance. it can. In addition, since the reinforcing metal fitting is attached to the connecting member, and the reinforcing metal fitting serves both as a role of supporting the grid-shaped reinforcing bar and a role of supporting the formwork, the construction is simplified and the construction cost can be reduced.
[0028]
According to the third aspect of the present invention, since the connecting member is a hole-in anchor and a bolt, the connecting member can be easily provided at a desired position, and the construction cost can be reduced.
[0029]
According to the additional cloth foundation method of claim 4, since the reinforcing bar fitting is integrated with the connecting member mounting piece, the reinforcing bar mounting piece, and the form fitting mounting piece, the construction work can be simplified and the construction cost is reduced. it can.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating installation of an additional fabric foundation according to an embodiment of the present invention.
FIG. 2 is a diagram showing a state in which a lattice reinforcing bar and a formwork are installed on an existing cloth foundation.
FIG. 3 is a diagram showing the arrangement of reinforcing bars in the additional fabric foundation method.
FIG. 4 is a perspective view of a reinforcing bar receiving member.
FIG. 5 is a perspective view of a form fitting.
FIG. 6 is a diagram illustrating installation of an additional fabric foundation according to a conventional example.
FIG. 7 is a view for explaining a connection state between the existing cloth foundation and the reinforcement of the additional cloth foundation according to the conventional example.
FIG. 8 is a diagram illustrating installation of an additional fabric foundation according to a conventional example.
FIG. 9 is a diagram illustrating a connection state between an existing cloth foundation and a reinforcing bar on an extension side according to a conventional example.
[Explanation of symbols]
1 Existing cloth foundation 2 Additional cloth foundation 3 Outside surface 4 Hole-in anchor (connecting member)
5 bolts (connecting member)
Reference Signs List 6 Nut 7 Reinforcement bracket 8 Formwork bracket 9 Nut 10 Mortar 11 Lattice bar 12 Lattice bar 13 Reinforcing bar 14 Formwork

Claims

In the extension cloth foundation method of constructing an extension cloth foundation of a new building adjacent to the cloth foundation of an existing building,
A new extension cloth foundation adjacent to the outer side of the cloth foundation of the existing building is tightly fixed to the outer side to be integrated with the outer side, and furthermore, the new extension cloth foundation including the new extension cloth foundation is continuously and integrally closed. An extension cloth foundation method characterized by constructing a new extension cloth foundation.

A method of constructing a new extension cloth foundation adjacent to the outer side of the cloth foundation of the existing building so that the new extension cloth foundation is tightly fixed to and integral with the outer side, and the new extension cloth foundation is closely fixed to the outer side. After connecting a reinforcing member to the connecting member, supporting the lattice-shaped rebar with the reinforcing member and supporting the formwork at a predetermined distance from the outer surface, and then supporting the formwork. The method of claim 1, wherein the concrete mortar is cast between the mold and the formwork.

3. The method according to claim 2, wherein the connecting member is a hole-in anchor and a bolt.

The rebar bracket is,
A connection member mounting piece mounted on the connection member,
A reinforcing-bar mounting piece that supports the lattice-shaped reinforcing bar extending in a direction perpendicular to the direction opposite to the outer surface from the end of the connecting member mounting piece;
Formwork fittings extending in a direction perpendicular to the direction opposite to the connecting member attaching piece from the end of the reinforcing bar mounting piece and attaching a formwork fitting for supporting the formwork at a predetermined distance from the outer surface. Mounting pieces,
4. The method of claim 1, further comprising: