JP2004084209A - Recyclable prefabricated continuous footing member and method of constructing foundation footing using it - Google Patents

Recyclable prefabricated continuous footing member and method of constructing foundation footing using it Download PDF

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JP2004084209A
JP2004084209A JP2002243988A JP2002243988A JP2004084209A JP 2004084209 A JP2004084209 A JP 2004084209A JP 2002243988 A JP2002243988 A JP 2002243988A JP 2002243988 A JP2002243988 A JP 2002243988A JP 2004084209 A JP2004084209 A JP 2004084209A
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JP
Japan
Prior art keywords
base member
prefabricated
recycled
fabric base
bottom plate
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JP2002243988A
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Japanese (ja)
Inventor
Hitoshi Mori
森 仁
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Individual
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Individual
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a recyclable prefabricated continuous footing member which improves constructibility while providing a connecting structure that is easy to dismantle. <P>SOLUTION: The recyclable prefabricated continuous footing member in the form of an inverted T comprises a rectangular PC bottom plate 11 and a rectangular PC beam 12 longitudinally connected to the PC bottom plate 11 on the longitudinal centerline of the PC bottom plate 11. A plurality of connecting bolts 121 arranged in vertically predetermined spaced relationship are provided to protrude near each longitudinal end of the PC beam 12. Connecting plates are positioned across the bolts and the bolts are tightened with nuts to interconnect adjacent PC beams. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、住宅、事務所等の建築物の布基礎として使用するための工場生産によるプレキャストコンクリート(以下本明細書においてはPCと略記する)布基礎部材に関し、特に前記建築物を解体した場合に、廃棄物とすることなく他の建築物の布基礎用として再度使用することのできることを目的としたリサイクル型プレファブ布基礎部材に関する。
【0002】
【従来の技術】
近年、住宅、事務所等の建築物の布基礎部分に、工場生産によるプレファブ布基礎部材を使用して場所打ちコンクリートの量を極力少なくし、工事期間を短縮するとともに部材の信頼性を高めたPC布基礎構造が広く採用されている。一例として特許文献1(特開昭48−32309号公報)に記載されたPC布基礎を図12、図13により説明する。
【0003】
図12はこの布基礎の斜視図、図13は縦断面図で、2はPC製の礎版、3は直方体状のPC基礎梁部材、Sは砂である。この布基礎は、まず地盤を根切りして底面に砂Sを水平に敷き均し、その上に礎版2を長手方向に隣接させながら水平に敷設し、その上面の長手方向中心線上に直方体状のPC基礎梁部材3を縦姿勢に配設し、G.L.で示す線まで土を埋め戻して構成される。
【0004】
隣接するPC基礎梁部材3相互の結合手段としては、PC基礎梁部材3内上下に底辺に平行して埋め込まれた引張り用の水平鉄筋の両端にピン孔を有する継手を設け、これにピンを打ち込んで接合するのがやり方が知られている。
このようなPC基礎梁部材の一例が特許文献2(特開2000−257078号公報)に記載されている。これを図14、15により説明する。図14はPC基礎梁部材3の正面図、図15は同じく平面図である。PC基礎梁部材3には上下2段に水平鉄筋31およびこれらを上下に連結するあばら筋などの配筋が埋め込まれ、水平鉄筋31の両端にピン孔を有する継手32、33が取り付けられている。継手32、33はPC基礎梁部材3の水平方向端面中央に鉛直方向に設けられた縦溝から突出しており、一方の継手32はピン孔を有する鋼板が2枚に分かれた受け手、他方の継手33は同様の形状の鋼板1枚からなる差し手となっており、継手32の2枚の鋼板の中間に継手33が挿入された状態でピン孔にピンを挿通することにより隣接するPC基礎梁部材3、3が連結される。連結後、接続部の隙間にモルタルを充填する。
【0005】
また、特許文献3(特開平10−8636号公報)には、これと異なる連結手段が記載されている。これを図16ないし18により説明する。図16はPC基礎梁部材3の内部に配置される鉄筋類を示す正面図で、31a はループ筋、34はあばら筋、35は金属管である。このPC基礎梁部材3は、長手方向両端付近に縦方向所定間隔で複数本の金属管35が埋め込まれており、両端の同じ高さの金属管35の間にループ筋31a が配置され、また上下のループ筋31a は複数本のあばら筋34で連結されている。金属管35はループ筋31a に支障のない水平方向内側に剛性を増すためのリブが設けられている。図17は隣接するPC基礎梁部材3の接続部を示す正面図で、前記の金属管にまたがるように接続板Pが取り付けられ、金属管35にボルトを挿通して接続板Pを締めつけることにより隣接するPC基礎梁部材3、3が連結される。図18は金属管35位置で切断したPC基礎梁部材3の縦断面図で、36は金属管35に挿入された接続用ボルトである。
【0006】
さらに特許文献4(特公昭52−33403号公報)には、このようなPC礎版およびPC基礎梁部材を使用した布基礎の構築方法が記載されている。これを図19により簡単に説明する。PC礎版2上面に凹部を形成し、かつPC基礎梁部材3の内部に縦方向の中空部を設けてある。前記PC礎版2の凹部とPC基礎梁部材3の中空部とにまたがる逆U字形の接合筋5を配置しておいて、前記PC礎版2の凹部とPC基礎梁部材3の中空部とにモルタル4を充填することにより、PC礎版とPC基礎梁部材との一体化を図っている。
【0007】
【特許文献1】
特開昭48−32309号公報(第1−3頁、第2図A、B)
【0008】
【特許文献2】
特開2000−257078号公報(第3頁、図27、図28)
【0009】
【特許文献3】
特開平10−8636号公報(第1−3頁、図4、図5、図6)
【0010】
【特許文献4】
特公昭52−33403号公報報(第1−2頁、第4図)
【0011】
【発明が解決しようとする課題】
ところで、建築物リサイクル法の施行により、建築物、特にビル等の半永久建築物に比較して寿命の短い住宅、事務所等の3階建て程度までの建築物については、建築物本来の性能の他に解体性が注目される情勢となっている。本発明は、前記した従来の技術に、施工性と解体性を加味したリサイクル型プレファブ布基礎部材を実現することを目的とする。
【0012】
【課題を解決するための手段】
本発明のリサイクル型プレファブ布基礎部材は、長方形板状のPC底版と、このPC底版の長手方向中心線上に縦向きに接続された長方形板状のPC梁とからなる逆T字状のもので、場合によっては前記PC底版の長手方向両端面位置と前記PC梁の長手方向両端面位置とが所定寸法だけずれている前記のリサイクル型プレファブ布基礎部材であるか、あるいは長方形板状部分とこれに直角方向の長方形板状部分とを接続した形状のPC底版と、この底版のそれぞれの長手方向中心線上に縦向きに接続された長方形板状のPC梁とからなる逆T字状のリサイクル型プレファブ布基礎部材であり、望ましくは前記PC梁の長手方向両端付近に縦方向所定間隔で複数本の接続用ボルトを突出させたことを特徴とするものであるか、前記PC底版の長手方向両端面に水平溝を設けた前記のリサイクル型プレファブ布基礎部材であり、さらに前記PC梁の長手方向両端面に縦方向の凸条または縦溝を設けてなる前記のリサイクル型プレファブ布基礎部材、あるいは前記PC梁の上面の一部に凹部を形成したことを特徴とする前記のリサイクル型プレファブ布基礎部材、また前記PC梁の中央付近の高さ中央位置に開口部を形成したことを特徴とする前記のリサイクル型プレファブ布基礎部材、さらにはまた前記PC梁の中央付近の底版に近い位置に開口部を形成したことを特徴とする前記のリサイクル型プレファブ布基礎部材である。
【0013】
本発明のリサイクル型プレファブ布基礎部材を使用する布基礎の構築方法は、地盤を根切りしてその底面に前記のリサイクル型プレファブ布基礎部材を長手方向に連続して敷設し、隣接するPC底版の長手方向端面の水平溝により形成される空間内に水平方向から棒材を挿入して隣接するPC底版を接続するとともに、隣接するPC梁の長手方向両端付近に突出する前記接続用ボルト間に接続板をかけ渡してナットで締めつけ、隣接するPC梁を接続することを特徴とするものである。
【0014】
【発明の実施の形態】
本発明においては、従来別個の部材であった床版(底板)と梁部材を製造段階で一体化して逆T字状断面のプレファブ布基礎部材としたので、施行現場における床版と梁部材との連結手段は不要となった。取り扱う部材の単重は増加するけれども、重機が簡単に使用できるので問題にはならない。
【0015】
また長手方向の連結をボルトと接続板とのボルト結合としたので、建築物を撤去する時点においてはナットをゆるめる作業のみでよく、かつプレファブ布基礎部材は新たな建築物の布基礎用として再使用できる。
またPC底版の長手方向両端面には水平溝を設け、敷設に際しては隣接するPC底版の長手方向端面の水平溝により形成される空間内に水平方向から棒材を挿入して隣接するPC底版を接続するようにしたので、長手方向のレベル出しを自動的に行うことができる。この部分も解体容易である。また棒材は隣接するPC底版間に作用する剪断荷重にも対抗できる。
【0016】
現地施行においてモルタルを一切使用しないでよいから工事がきわめて単純であり、かつモルタルの養生期間が不要なので工期も短縮される。
【0017】
【実施例】
本発明の実施例を図面により説明する。図1は実施例のリサイクル型プレファブ布基礎部材1を示す斜視図で、長方形板状のPC底版11と、このPC底版11の長手方向中心線上に縦向きに接続された長方形板状のPC梁12とからなる逆T字状をしている。
【0018】
前記PC底版11の長手方向両端面には水平溝111 が設けられ、前記PC梁12の長手方向両端付近には、縦方向所定間隔で複数本の接続用ボルト121 が突出している。また前記PC梁12の上面の所定箇所には、アンカーボルトを植え込むためのインサートナット128 が埋設されている。
寸法例を示すと、長手方向長さはモジュールとして例えば1m、PC底版11の幅は45cmまたは60cm、厚さは15cm、PC梁12の高さは55〜70cm、幅は12cmまたは15cmで、標準寸法で規格化することが設計上も好ましい。
【0019】
プレファブ布基礎部材1の各角面は斜面幅で10mm程度の面取りを行う。またPC底版11とPC梁12との接続部分は応力集中を避けるため幅20mm程度の斜面とする。
PC底版11の裏面は横すべり防止のため波高 3〜5 mm程度の櫛引き仕上とするのがよい。
【0020】
図2は、PC梁12の両端付近を示す実施例のリサイクル型プレファブ布基礎部材の部分斜視図で、122 はPC梁12の長手方向の端面に設けられた縦方向の凸条、123 は同じくPC梁12の長手方向の端面に設けられた縦方向の縦溝である。端面の一方を凸条122 、他方を縦溝123 として互いに嵌合させて接続してもよいし、両側共に縦溝123 とし、PC底版の接続と同様に隣接するPC梁12の縦溝123 により形成される空間内に上方から棒材を挿入して隣接するPC梁12を接続するようにしてもよい。いずれの場合も凸条122 または縦溝123 がガイドになって長手方向の中心出しが自動的に行われる。
【0021】
図3は本発明のリサイクル型プレファブ布基礎部材1の変形例を示す正面図で、PC底版11の長手方向両端面位置とPC梁12の長手方向両端面位置とが所定寸法だけずれている。例えばプレファブ布基礎部材1の長手方向が1mである場合にPC底版11とPC梁12の長手方向両端面位置を 250mmずらしてある。このようにすると、布基礎の危険断面が分散されるとともに、レベル出しが自動的に行われるので図1に示した水平溝111 を省略することもできる。
【0022】
図4は本発明の実施例のリサイクル型プレファブ布基礎部材の接続部分を示す部分斜視図で、Bは隣接するPC底版11の長手方向端面の水平溝111 により形成される空間内に水平方向から挿入される棒材、Pは隣接するPC梁12の長手方向両端付近に突出する接続用ボルト121 間にかけ渡して隣接するPC梁12、12を接続する接続板である。
【0023】
棒材Bは水平溝111 の断面形状に対応させ、六角形、長方形、円等の断面とする。材質はPC、金属、硬質樹脂等任意に選定できる。また棒材Bは必ずしも水平溝111 の全長にわたって挿入される必要はないので、短いものを水平溝111 の両側から打ち込んでもよい。
図5は建築物の角部や内壁等の中間梁の接続部に使用する本発明の実施例のリサイクル型プレファブ布基礎部材を示す平面図で、(a)ないし(g)にその具体例を示す。
【0024】
いずれも、長方形板状部分とこれに直角方向の長方形板状部分とを接続した形状のPC底版と、この底版のそれぞれの長手方向中心線上に縦向きに接続された長方形板状のPC梁とからなるものである。(c)、(e)、(f)、(g)に示すものについては、接続される中間梁の間隔をモジュール寸法とすることが望ましい。
【0025】
図6は本発明のリサイクル型プレファブ布基礎部材の変形例を示す正面図で、(a)ではPC梁12の上面に突出部124 と凹部125 を交互に形成し、突出部124 にアンカーボルトを配置して土台を取り付け、凹部125 と取り付けた土台との間に形成される開口を床下換気口として利用しようとするものである。(b)に示すように凹部125 を中央1か所のやや大型のもの、例えば80×400 mm程度としてもよい。
【0026】
図7は本発明のリサイクル型プレファブ布基礎部材の他の変形例を示す正面図で、126 はPC梁12の中央付近の高さ中央位置に形成した開口部である。開口部126 は例えば 350×600 mm程度の大きさで、床下の点検等の際の出入り口として利用する。
図8は同じく本発明のリサイクル型プレファブ布基礎部材の他の変形例を示す正面図で、127 はPC梁12の中央付近の底版に近い位置に形成した開口部で、例えば170 ×300 mm程度のものである。図7の開口部126 と同様、床下の点検等の際の出入り口として利用する他、給水、排水等の水配管、ガス管、電線等の通り道として使用することができる。
【0027】
図9(a)はPC梁12の長手方向両端付近に突出する接続用ボルト121 を示す斜視図、(b)は接続用ボルト121 位置におけるPC梁12の部分断面図である。(b)に示すように接続用ボルト121 は中央部分がPC梁12の内部に埋め込まれ、両端のねじ部のみが突出しているが、埋め込まれる中央部分に水平方向のリブを取付け、ループ筋から伝達される水平荷重による曲げ作用に抵抗するようにしてある。
【0028】
図10は本発明のリサイクル型プレファブ布基礎部材内部の配筋13および接続用ボルト121 を示す斜視図で、131 はループ筋、132 はあばら筋、133 は底版補強筋である。ループ筋131 は両側の接続用ボルト121 の外側をかこむように配筋され、あばら筋132 は上方のループ筋131 と下方の底版補強筋133 とを接続して応力を伝達している。
【0029】
図11は本発明におけるループ筋131 の異なる態様を示すリサイクル型プレファブ布基礎部材の正面図で、(a)では上下3段に配置された接続用ボルト121 のうち上段および下段のものをそれぞれ結んでいるのに対し、(b)では上段および下段の接続用ボルト121 を大きく囲んで配筋している。いずれの場合も中段の接続用ボルト121 はループ筋131 と直接応力伝達を行わないけれども、接続板Pを介して鉛直方向の剪断荷重に対して抵抗できるから有用である。
【0030】
以上の説明に加えて本発明のリサイクル型プレファブ布基礎部材を使用する布基礎の構築方法を改めて説明すると、地盤を根切りしてその底面に前記のリサイクル型プレファブ布基礎部材1を長手方向に連続して敷設し、隣接するPC底版11の長手方向端面の水平溝111 により形成される空間内に水平方向から棒材Bを挿入して隣接するPC底版11を接続するとともに、隣接するPC梁12の長手方向両端付近に突出する前記接続用ボルト121 間に接続板Pをかけ渡してナットで締めつけ、隣接するPC梁12を接続することを特徴とするものである。
【0031】
【発明の効果】
本発明によれば、床版と梁部材とが製造段階で一体化されて施行に際してモルタルが不要であり、部材の信頼性が向上するとともに接続部をボルト接続とすることにより解体性にすぐれた布基礎部材が実現し、建設段階においては工期が短縮され、解体の際にはリサイクルが可能となるなどのすぐれた効果を奏する。
【図面の簡単な説明】
【図1】本発明の実施例のプレファブ布基礎部材を示す斜視図である。
【図2】本発明の実施例のプレファブ布基礎部材を示す部分斜視図である。
【図3】本発明のプレファブ布基礎部材の変形例を示す正面図である。
【図4】本発明の実施例のプレファブ布基礎部材の接続部分を示す部分斜視図である。
【図5】本発明のプレファブ布基礎部材の他の実施例を示す平面図である。
【図6】本発明のプレファブ布基礎部材の変形例を示す正面図である。
【図7】本発明のプレファブ布基礎部材の他の変形例を示す正面図である。
【図8】同じく本発明のプレファブ布基礎部材の他の変形例を示す正面図である。
【図9】(a)は本発明の実施例のプレファブ布基礎部材における接続用ボルトを示す斜視図、(b)は接続用ボルト位置におけるプレファブ布基礎部材の部分断面図である。
【図10】本発明の実施例のプレファブ布基礎部材における内部配筋等を示す斜視図である。
【図11】本発明の実施例におけるループ筋の異なる態様を示すプレファブ布基礎部材の正面図である。
【図12】
従来の技術におけるPC布基礎の斜視図である。
【図13】
従来の技術におけるPC布基礎の縦断面図である。
【図14】
他の従来の技術におけるPC基礎梁部材の正面図である。
【図15】
同じく他の従来の技術におけるPC基礎梁部材の平面図である。
【図16】
従来の技術におけるPC基礎梁部材の内部鉄筋を示す正面図である。
【図17】
従来の技術におけるPC基礎梁部材の接続部を示す正面図である。
【図18】
従来の技術におけるPC基礎梁部材の縦断面図である。
【図19】
従来の技術における布基礎の縦断面図である。
【符号の説明】
1  プレファブ布基礎部材
2  PC礎版
3  PC基礎梁部材
4  モルタル
5  接合筋
11   PC底版
12  PC梁
13  配筋
31  水平鉄筋
31a 、131  ループ筋
32、33  継手
34、132  あばら筋
35  金属管
36、121   接続用ボルト
111  水平溝
122  凸条
123  縦溝
124  突出部
125  凹部
126 、127  開口部
128  インサートナット
133  底版補強筋
B  棒材
P  接続板
S  砂
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a factory-produced precast concrete (hereinafter abbreviated as PC) cloth foundation member for use as a cloth foundation for buildings such as houses and offices, particularly when the building is dismantled. Also, the present invention relates to a recyclable prefabricated cloth base member intended to be reused as a cloth base of another building without being discarded.
[0002]
[Prior art]
In recent years, the amount of cast-in-place concrete has been reduced as much as possible by using prefabricated fabric base members produced by factories for fabric base parts of buildings such as houses and offices, shortening the construction period and improving the reliability of the members. PC cloth foundation structure is widely adopted. As an example, a PC cloth base described in Patent Document 1 (Japanese Patent Application Laid-Open No. 48-32309) will be described with reference to FIGS.
[0003]
12 is a perspective view of the cloth foundation, FIG. 13 is a longitudinal sectional view, 2 is a PC base plate, 3 is a rectangular parallelepiped PC foundation beam member, and S is sand. This cloth foundation is firstly grounded, sand S is laid horizontally on the bottom surface, and the foundation slab 2 is laid horizontally on the bottom while adjoining the base plate 2 in the longitudinal direction. The PC-shaped foundation beam member 3 is disposed in a vertical position. L. The soil is backfilled up to the line indicated by.
[0004]
As means for connecting the adjacent PC foundation beam members 3 to each other, a joint having pin holes at both ends of a horizontal tension reinforcing bar embedded in parallel with the base vertically above and below the PC foundation beam member 3 is provided. It is known to drive and join.
An example of such a PC foundation beam member is described in Patent Document 2 (Japanese Patent Application Laid-Open No. 2000-257078). This will be described with reference to FIGS. FIG. 14 is a front view of the PC foundation beam member 3, and FIG. 15 is a plan view of the same. In the PC foundation beam member 3, horizontal reinforcing bars 31 and stirrups such as stirrups connecting them vertically are embedded in upper and lower two stages, and joints 32, 33 having pin holes at both ends of the horizontal reinforcing bars 31 are attached. . The joints 32 and 33 project from a vertical groove provided in the center of the horizontal end face of the PC foundation beam member 3 in the vertical direction. One joint 32 is a receiver in which a steel plate having a pin hole is divided into two pieces, and the other joint is Reference numeral 33 denotes a hand made of a single steel plate having a similar shape, and a PC beam that is adjacent to the PC base beam is inserted by inserting a pin into a pin hole in a state where the joint 33 is inserted between two steel plates of the joint 32. The members 3, 3 are connected. After the connection, the mortar is filled in the gap between the connection portions.
[0005]
Patent Document 3 (Japanese Patent Application Laid-Open No. 10-8636) discloses a different connecting means. This will be described with reference to FIGS. FIG. 16 is a front view showing rebars arranged inside the PC foundation beam member 3, wherein 31a is a loop bar, 34 is a stirrup, and 35 is a metal tube. In this PC foundation beam member 3, a plurality of metal tubes 35 are embedded at predetermined longitudinal intervals near both ends in the longitudinal direction, and a loop streak 31a is arranged between metal tubes 35 at the same height at both ends. The upper and lower loops 31a are connected by a plurality of stirrups 34. The metal tube 35 is provided with a rib for increasing rigidity on the inside in the horizontal direction which does not hinder the loop streaks 31a. FIG. 17 is a front view showing a connection portion of the adjacent PC foundation beam member 3. A connection plate P is attached so as to straddle the metal tube, and a bolt is inserted through the metal tube 35 to tighten the connection plate P. The adjacent PC foundation beam members 3, 3 are connected. FIG. 18 is a longitudinal sectional view of the PC foundation beam member 3 cut at the position of the metal tube 35, and 36 is a connection bolt inserted into the metal tube 35.
[0006]
Further, Patent Document 4 (Japanese Patent Publication No. 52-33403) describes a method of constructing a cloth foundation using such a PC foundation plate and a PC foundation beam member. This will be briefly described with reference to FIG. A concave portion is formed on the upper surface of the PC base plate 2, and a vertical hollow portion is provided inside the PC base beam member 3. An inverted U-shaped joint 5 extending over the concave portion of the PC base plate 2 and the hollow portion of the PC basic beam member 3 is arranged, and the concave portion of the PC base plate 2 and the hollow portion of the PC basic beam member 3 are arranged. Is filled with mortar 4 to integrate the PC foundation plate and the PC foundation beam member.
[0007]
[Patent Document 1]
JP-A-48-32309 (pages 1-3, FIGS. 2A, B)
[0008]
[Patent Document 2]
Japanese Patent Application Laid-Open No. 2000-257078 (page 3, FIG. 27, FIG. 28)
[0009]
[Patent Document 3]
JP-A-10-8636 (pages 1-3, FIGS. 4, 5, and 6)
[0010]
[Patent Document 4]
Gazette of Japanese Patent Publication No. 52-33403 (Page 1-2, Figure 4)
[0011]
[Problems to be solved by the invention]
By the way, due to the enforcement of the Building Recycling Law, buildings, especially houses with short lifespans and buildings up to about 3 stories such as offices compared to semi-permanent buildings such as buildings, In addition, dismantling has become a focus of attention. An object of the present invention is to realize a recycle-type prefabricated cloth base member in which the workability and the disassembly property are added to the conventional technology described above.
[0012]
[Means for Solving the Problems]
The recycled prefabricated fabric base member of the present invention is an inverted T-shaped one comprising a rectangular plate-shaped PC bottom plate and a rectangular plate-shaped PC beam vertically connected to a longitudinal center line of the PC bottom plate. In some cases, the recycled prefabricated fabric base member in which the longitudinal end positions of the PC bottom plate and the longitudinal ends of the PC beam are shifted by a predetermined dimension, or a rectangular plate-like portion Inverted T-shaped recycle type consisting of a PC bottom plate in which a rectangular plate-shaped portion in a direction perpendicular to the bottom plate is connected, and a rectangular plate-shaped PC beam vertically connected to each longitudinal center line of the bottom plate. A prefabricated fabric base member, preferably characterized by projecting a plurality of connecting bolts at predetermined longitudinal intervals near both ends in the longitudinal direction of the PC beam; The recycle-type prefabricated fabric base member having horizontal grooves provided at both ends in the hand direction, and the recycle-type prefabricated fabric base further comprising longitudinal projections or vertical grooves provided at both longitudinal end surfaces of the PC beam. The recycle-type prefabricated cloth base member, wherein a recess is formed in a part of the upper surface of the member or the PC beam, and an opening is formed at a height center position near the center of the PC beam. The recycled prefabricated fabric base member described above, wherein an opening is formed near the center of the PC beam near the bottom slab.
[0013]
The method of constructing a cloth foundation using the recycled prefabricated fabric base member of the present invention is a method of cutting a ground, laying the recycled prefabricated fabric base member continuously on a bottom surface thereof in a longitudinal direction, and adjoining a PC bottom plate. A bar is inserted from the horizontal direction into the space defined by the horizontal grooves on the longitudinal end surfaces of the adjacent PC beams to connect adjacent PC bottom plates, and between the connecting bolts protruding near the longitudinal ends of adjacent PC beams. The present invention is characterized in that a connection plate is stretched and fastened with a nut to connect adjacent PC beams.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, the floor slab (bottom plate) and the beam member, which were conventionally separate members, were integrated at the manufacturing stage to form a prefab fabric base member having an inverted T-shaped cross section. Is no longer necessary. Although the unit weight of the member to be handled increases, this is not a problem because the heavy equipment can be easily used.
[0015]
In addition, since the connection in the longitudinal direction is a bolt connection between the bolt and the connecting plate, only the work of loosening the nuts at the time of removing the building is necessary, and the prefabricated fabric base member is re-used for fabric foundation of a new building. Can be used.
Horizontal grooves are provided on both longitudinal end faces of the PC bottom slab. At the time of laying, the bar is inserted from the horizontal direction into a space formed by the horizontal grooves on the longitudinal end faces of the adjacent PC bottom slabs to insert the adjacent PC bottom slabs. Since the connection is made, leveling in the longitudinal direction can be automatically performed. This part is also easy to dismantle. Also, the bar can withstand the shear load acting between adjacent PC bottom plates.
[0016]
The construction is extremely simple because no mortar is required in the field construction, and the construction period is shortened because no mortar curing period is required.
[0017]
【Example】
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a recycle-type prefabricated fabric base member 1 of an embodiment, in which a rectangular plate-shaped PC bottom plate 11 and a rectangular plate-shaped PC beam vertically connected to a longitudinal center line of the PC bottom plate 11 are shown. 12 and an inverted T-shape.
[0018]
Horizontal grooves 111 are provided on both end surfaces in the longitudinal direction of the PC bottom plate 11, and a plurality of connection bolts 121 project at predetermined longitudinal intervals near both ends in the longitudinal direction of the PC beam 12. An insert nut 128 for implanting an anchor bolt is buried at a predetermined position on the upper surface of the PC beam 12.
For example, the length in the longitudinal direction is 1 m as a module, the width of the PC bottom plate 11 is 45 cm or 60 cm, the thickness is 15 cm, the height of the PC beam 12 is 55 to 70 cm, and the width is 12 cm or 15 cm. It is preferable in terms of design to standardize the dimensions.
[0019]
Each corner surface of the prefabricated fabric base member 1 is chamfered with a slope width of about 10 mm. The connecting portion between the PC bottom plate 11 and the PC beam 12 has a slope of about 20 mm width to avoid stress concentration.
The back surface of the PC bottom plate 11 is preferably comb-finished with a wave height of about 3 to 5 mm in order to prevent side slip.
[0020]
FIG. 2 is a partial perspective view of the recycle-type prefabricated fabric base member of the embodiment showing the vicinity of both ends of the PC beam 12, where 122 is a longitudinal ridge provided on the longitudinal end face of the PC beam 12, and 123 is the same. This is a vertical flute provided on the end face of the PC beam 12 in the longitudinal direction. One of the end faces may be connected by fitting each other as a ridge 122 and the other as a vertical groove 123, or both sides may be formed as vertical grooves 123, and similarly to the connection of the PC bottom plate, by the vertical grooves 123 of the adjacent PC beam 12. A bar may be inserted from above into the space formed to connect the adjacent PC beams 12. In any case, the ridge 122 or the vertical groove 123 serves as a guide to automatically perform centering in the longitudinal direction.
[0021]
FIG. 3 is a front view showing a modified example of the recycle-type prefabricated fabric base member 1 of the present invention, in which the positions of both longitudinal end faces of the PC bottom plate 11 and the longitudinal end faces of the PC beam 12 are shifted by a predetermined dimension. For example, when the longitudinal direction of the prefabricated fabric base member 1 is 1 m, the positions of both longitudinal end faces of the PC bottom plate 11 and the PC beam 12 are shifted by 250 mm. In this way, the dangerous cross section of the fabric foundation is dispersed and the leveling is automatically performed, so that the horizontal groove 111 shown in FIG. 1 can be omitted.
[0022]
FIG. 4 is a partial perspective view showing a connection portion of the recycle-type prefabricated cloth base member according to the embodiment of the present invention, wherein B denotes a horizontal direction in a space formed by a horizontal groove 111 on the longitudinal end face of the adjacent PC bottom plate 11. A bar P to be inserted is a connecting plate that connects between adjacent PC beams 12 and 12 by connecting between connecting bolts 121 protruding near both ends in the longitudinal direction of adjacent PC beams 12.
[0023]
The bar B has a cross section such as a hexagon, a rectangle, and a circle corresponding to the cross section of the horizontal groove 111. The material can be arbitrarily selected such as PC, metal, hard resin and the like. Since the bar B does not necessarily have to be inserted over the entire length of the horizontal groove 111, a short one may be driven from both sides of the horizontal groove 111.
FIG. 5 is a plan view showing a recycle-type prefabricated fabric base member of an embodiment of the present invention used for a connection portion of an intermediate beam such as a corner or an inner wall of a building, and specific examples are shown in (a) to (g). Show.
[0024]
In each case, a PC bottom plate having a shape in which a rectangular plate portion and a rectangular plate portion perpendicular to the rectangular plate portion are connected to each other, and a rectangular plate-shaped PC beam vertically connected to each longitudinal center line of the bottom plate. It consists of As for (c), (e), (f), and (g), it is desirable that the interval between the connected intermediate beams be a module size.
[0025]
FIG. 6 is a front view showing a modification of the recycle prefabricated fabric base member of the present invention. In FIG. 6A, protrusions 124 and recesses 125 are alternately formed on the upper surface of the PC beam 12, and anchor bolts are attached to the protrusions 124. The base is arranged and attached, and an opening formed between the concave portion 125 and the attached base is intended to be used as an underfloor ventilation port. As shown in (b), the recess 125 may be a slightly large one at the center, for example, about 80 × 400 mm.
[0026]
FIG. 7 is a front view showing another modified example of the recycle-type prefabricated fabric base member of the present invention. Reference numeral 126 denotes an opening formed at the height center position near the center of the PC beam 12. The opening 126 has a size of, for example, about 350 × 600 mm and is used as an entrance for inspection under the floor.
FIG. 8 is a front view showing another modified example of the recycle prefabricated fabric base member of the present invention. Reference numeral 127 denotes an opening formed near the center of the PC beam 12 and near the bottom slab, for example, about 170 × 300 mm. belongs to. Like the opening 126 in FIG. 7, it can be used as a doorway for inspection under the floor and the like, and can also be used as a passage for water pipes such as water supply and drainage, gas pipes, electric wires, and the like.
[0027]
9A is a perspective view showing connection bolts 121 protruding near both ends in the longitudinal direction of the PC beam 12, and FIG. 9B is a partial cross-sectional view of the PC beam 12 at the position of the connection bolt 121. As shown in (b), the connection bolt 121 has a central portion embedded in the inside of the PC beam 12 and only the threaded portions at both ends protruding. It is designed to resist bending action due to the transmitted horizontal load.
[0028]
FIG. 10 is a perspective view showing the reinforcing bars 13 and the connecting bolts 121 inside the recycle-type prefabricated fabric base member of the present invention, wherein 131 is a loop bar, 132 is a stirrup bar, and 133 is a bottom plate reinforcing bar. The loops 131 are arranged so as to bite the outside of the connecting bolts 121 on both sides, and the stirrups 132 connect the upper loops 131 and the lower reinforcement 133 to transmit stress.
[0029]
FIG. 11 is a front view of a recycle-type prefabricated cloth base member showing a different aspect of the loop streaks 131 of the present invention. In FIG. 11A, upper and lower connection bolts 121 of connection bolts 121 arranged in three upper and lower rows are respectively connected. In contrast, in (b), the upper and lower connecting bolts 121 are arranged so as to surround the connecting bolts 121 largely. In any case, the middle connection bolt 121 does not directly transmit stress to the loop bar 131, but is useful because it can resist a vertical shear load via the connection plate P.
[0030]
In addition to the above description, the method of constructing a fabric foundation using the recyclable prefabricated fabric base member of the present invention will be described again. Continuously laying, the bar B is inserted from the horizontal direction into the space defined by the horizontal groove 111 on the longitudinal end face of the adjacent PC bottom slab 11 to connect the adjacent PC bottom slab 11, and to connect the adjacent PC beam. A connection plate P is stretched between the connection bolts 121 protruding near both ends in the longitudinal direction of the PC 12 and fastened with nuts to connect adjacent PC beams 12.
[0031]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, a slab and a beam member are integrated in a manufacturing stage, and a mortar is unnecessary at the time of an enforcement, the reliability of a member improves, and the disassembly property was excellent by making a connection part a bolt connection. The fabric base member is realized, and it has excellent effects such as shortening the construction period at the construction stage and enabling recycling at the time of dismantling.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a prefabricated fabric base member according to an embodiment of the present invention.
FIG. 2 is a partial perspective view showing a prefabricated fabric base member according to the embodiment of the present invention.
FIG. 3 is a front view showing a modified example of the prefabricated fabric base member of the present invention.
FIG. 4 is a partial perspective view showing a connection portion of a prefabricated fabric base member according to the embodiment of the present invention.
FIG. 5 is a plan view showing another embodiment of the prefabricated fabric base member of the present invention.
FIG. 6 is a front view showing a modified example of the prefabricated fabric base member of the present invention.
FIG. 7 is a front view showing another modified example of the prefabricated fabric base member of the present invention.
FIG. 8 is a front view showing another modification of the prefabricated fabric base member of the present invention.
FIG. 9A is a perspective view showing connection bolts in the prefabricated cloth base member of the embodiment of the present invention, and FIG. 9B is a partial cross-sectional view of the prefabricated cloth base member at the connection bolt position.
FIG. 10 is a perspective view showing an internal reinforcing arrangement and the like in the prefabricated fabric base member of the embodiment of the present invention.
FIG. 11 is a front view of a prefabricated cloth base member showing different aspects of loop streaks in the example of the present invention.
FIG.
It is a perspective view of the PC cloth foundation in the prior art.
FIG. 13
It is a longitudinal section of the PC cloth foundation in the prior art.
FIG. 14
It is a front view of PC foundation beam member in other conventional arts.
FIG.
It is a top view of PC foundation beam member similarly in other conventional techniques.
FIG.
It is a front view which shows the internal reinforcement of the PC foundation beam member in the prior art.
FIG.
It is a front view which shows the connection part of the PC foundation beam member in the prior art.
FIG.
It is a longitudinal section of the PC foundation beam member in the prior art.
FIG.
It is a longitudinal section of the cloth foundation in the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Prefab cloth base member 2 PC base plate 3 PC base beam member 4 Mortar 5 Joint bar 11 PC bottom plate 12 PC beam 13 Bar arrangement 31 Horizontal reinforcing bars 31a, 131 Loop bars 32, 33 Joints 34, 132 Stirrups 35 Metal tube 36, 121 Connection bolt 111 Horizontal groove 122 Convex ridge 123 Vertical groove 124 Projection 125 Recess 126, 127 Opening 128 Insert nut 133 Bottom plate reinforcing bar B Bar P Connecting plate S Sand

Claims (10)

長方形板状のPC底版(11)と、このPC底版(11)の長手方向中心線上に縦向きに接続された長方形板状のPC梁(12)とからなる逆T字状のリサイクル型プレファブ布基礎部材。An inverted T-shaped recycled prefabricated cloth comprising a rectangular plate-shaped PC bottom plate (11) and a rectangular plate-shaped PC beam (12) vertically connected to the longitudinal center line of the PC bottom plate (11). Foundation members. 前記PC底版(11)の長手方向両端面位置と前記PC梁(12)の長手方向両端面位置とが所定寸法だけずれている請求項1に記載のリサイクル型プレファブ布基礎部材。The recycled prefabricated fabric base member according to claim 1, wherein the position of both ends in the longitudinal direction of the PC bottom plate (11) and the positions of both ends in the longitudinal direction of the PC beam (12) are shifted by a predetermined dimension. 長方形板状部分とこれに直角方向の長方形板状部分とを接続した形状のPC底版(11)と、この底版のそれぞれの長手方向中心線上に縦向きに接続された長方形板状のPC梁(12)とからなる逆T字状のリサイクル型プレファブ布基礎部材。A PC bottom plate (11) having a shape in which a rectangular plate portion and a rectangular plate portion perpendicular to the rectangular plate portion are connected to each other, and a rectangular plate-like PC beam vertically connected to each longitudinal center line of the bottom plate ( 12) An inverted T-shaped recycled prefabricated fabric base member comprising: 前記PC梁(12)の長手方向両端付近に縦方向所定間隔で複数本の接続用ボルト(121 )を突出させたことを特徴とする請求項1または3のいずれかに記載のリサイクル型プレファブ布基礎部材。4. A recycled prefabricated cloth according to claim 1, wherein a plurality of connecting bolts are protruded at predetermined intervals in the longitudinal direction near both ends in the longitudinal direction of the PC beam. Foundation members. 前記PC底版(11)の長手方向両端面に水平溝(111 )を設けた請求項1または4のいずれかに記載のリサイクル型プレファブ布基礎部材。The recycled prefabricated fabric base member according to any one of claims 1 to 4, wherein horizontal grooves (111 °) are provided on both longitudinal end surfaces of the PC bottom slab (11). 前記PC梁(12)の長手方向両端面に縦方向の凸条(122 )または縦溝(123 )を設けてなる請求項1ないし5のいずれかに記載のリサイクル型プレファブ布基礎部材。The recycled prefabricated fabric base member according to any one of claims 1 to 5, wherein a longitudinal ridge (122 °) or a vertical groove (123 °) is provided on both longitudinal end surfaces of the PC beam (12). 前記PC梁(12)の上面の一部に凹部(125 )を形成したことを特徴とする請求項1ないし6のいずれかに記載のリサイクル型プレファブ布基礎部材。The recycled prefabricated fabric base member according to any one of claims 1 to 6, wherein a concave portion (125 °) is formed in a part of an upper surface of the PC beam (12). 前記PC梁(12)の中央付近の高さ中央位置に開口部(126 )を形成したことを特徴とする請求項1ないし7のいずれかに記載のリサイクル型プレファブ布基礎部材。The refabricated prefabricated fabric base member according to any one of claims 1 to 7, wherein an opening (126) is formed at a height center position near the center of the PC beam (12). 前記PC梁(12)の中央付近の底版に近い位置に開口部(127 )を形成したことを特徴とする請求項1ないし8のいずれかに記載のリサイクル型プレファブ布基礎部材。The recycled prefabricated cloth base member according to any one of claims 1 to 8, wherein an opening (127 °) is formed near the center of the PC beam (12) near the bottom plate. 地盤を根切りしてその底面に請求項1ないし9のいずれかに記載のリサイクル型プレファブ布基礎部材を長手方向に連続して敷設し、隣接するPC底版の長手方向端面の水平溝により形成される空間内に水平方向から棒材を挿入して隣接するPC底版を接続するとともに、隣接するPC梁の長手方向両端付近に突出する前記接続用ボルト間に接続板をかけ渡してナットで締めつけ、隣接するPC梁を接続することを特徴とするリサイクル型プレファブ布基礎部材を使用する布基礎の構築方法。The ground is cut off, and the recycle-type prefabricated fabric base member according to any one of claims 1 to 9 is continuously laid in a longitudinal direction on a bottom surface thereof, and is formed by a horizontal groove on a longitudinal end face of an adjacent PC bottom slab. A horizontal bar is inserted into the space between the adjacent PC beams to connect the adjacent PC bottom plates, and a connecting plate is extended between the connecting bolts protruding near both ends in the longitudinal direction of the adjacent PC beam, and tightened with a nut. A method of constructing a cloth foundation using a recycled prefabricated cloth foundation member, characterized in that adjacent PC beams are connected.
JP2002243988A 2002-08-23 2002-08-23 Recyclable prefabricated continuous footing member and method of constructing foundation footing using it Pending JP2004084209A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013007242A (en) * 2011-06-27 2013-01-10 Yoshicon Inc Concrete block for building foundation and prefab foundation construction method using the same
CN105178352A (en) * 2015-09-25 2015-12-23 重庆建工市政交通工程有限责任公司 Bench for prefabricating adjustable T-type beams with non-equal spans and different bottom widths and construction method of bench
JP2017020234A (en) * 2015-07-09 2017-01-26 大和ハウス工業株式会社 Precast concrete foundation
JP2020033868A (en) * 2015-07-09 2020-03-05 大和ハウス工業株式会社 Precast concrete foundation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013007242A (en) * 2011-06-27 2013-01-10 Yoshicon Inc Concrete block for building foundation and prefab foundation construction method using the same
JP2017020234A (en) * 2015-07-09 2017-01-26 大和ハウス工業株式会社 Precast concrete foundation
JP2020033868A (en) * 2015-07-09 2020-03-05 大和ハウス工業株式会社 Precast concrete foundation
CN105178352A (en) * 2015-09-25 2015-12-23 重庆建工市政交通工程有限责任公司 Bench for prefabricating adjustable T-type beams with non-equal spans and different bottom widths and construction method of bench

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