JP2012154042A - Site-precast construction method for footing beam - Google Patents

Site-precast construction method for footing beam Download PDF

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JP2012154042A
JP2012154042A JP2011011833A JP2011011833A JP2012154042A JP 2012154042 A JP2012154042 A JP 2012154042A JP 2011011833 A JP2011011833 A JP 2011011833A JP 2011011833 A JP2011011833 A JP 2011011833A JP 2012154042 A JP2012154042 A JP 2012154042A
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foundation
site
bed
foundation beam
precast
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JP5574338B2 (en
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Hitoshi Shirasaka
均 白坂
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Shimizu Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a site-precast construction method for a footing beam, achieving a shorter construction period for building foundation work and improved workability.SOLUTION: In the site-precast construction method for manufacturing the footing beam of a building as a precast concrete member at a building site, ground improvement is precedingly performed on a lower side 6 of a site for a floor concrete 2 to be installed to level a ground surface 8, a side surface form 16 is disposed on a bed while using the ground surface 8 as the bed for the precast concrete member, and concrete is placed in a recess 18 formed between the bed and the side surface form 16 to manufacture the footing beam 20.

Description

本発明は、基礎梁のサイトプレキャスト工法に関するものである。   The present invention relates to a site precast method for foundation beams.

従来、建築現場においてプレキャストコンクリート（以下、ＰＣａともいう。）部材を製造し、このＰＣａ部材を用いて建築物を構築するサイトプレキャスト工法が知られている（例えば、特許文献１〜３参照）。建築現場の敷地が広く、施工ヤードの確保が容易な場合には、工場ではなく建築現場にてＰＣａ部材を製作すれば工場から現場までの部材運搬費の節減が見込める。   Conventionally, a site precast method of manufacturing a precast concrete (hereinafter also referred to as PCa) member at a construction site and constructing a building using the PCa member is known (see, for example, Patent Documents 1 to 3). If the site of the construction site is large and it is easy to secure the construction yard, if the PCa member is manufactured not at the factory but at the construction site, the cost of transporting the material from the factory to the site can be expected.

実開平５−５２１１０号公報Japanese Utility Model Publication No. 5-52110 特開２００９−２４３０７５号公報JP 2009-243075 A 特開２００９−１９７４１３号公報JP 2009-197413 A

ところで、建築物の基礎梁をプレキャストコンクリート部材として建築現場で製造し（サイトプレキャスト化）、基礎工事の工期短縮および施工性の改善を図る工法の開発が望まれていた。   By the way, it has been desired to develop a construction method in which a foundation beam of a building is manufactured as a precast concrete member at a construction site (site precast), and the construction period is shortened and the workability is improved.

本発明は、上記に鑑みてなされたものであって、建築物の基礎工事の工期短縮および施工性の改善を図ることができる基礎梁のサイトプレキャスト工法を提供することを目的とする。   This invention is made | formed in view of the above, Comprising: It aims at providing the site precast construction method of the foundation beam which can aim at the shortening of the construction period of the foundation construction of a building, and improvement of workability.

上記した課題を解決し、目的を達成するために、本発明の請求項１に係る基礎梁のサイトプレキャスト工法は、建築物の基礎梁をプレキャストコンクリート部材として建築現場で製造するサイトプレキャスト工法であって、土間コンクリートの設置予定箇所の下側の地盤改良を先行実施してこの地盤面を整地し、この地盤面をプレキャストコンクリート部材用のベッドとして用い、このベッド上に側面型枠を配置して、前記ベッドと前記側面型枠とによって形成される凹部にコンクリート打設して基礎梁を製造することを特徴とする。   In order to solve the above-described problems and achieve the object, the site precast method for a foundation beam according to claim 1 of the present invention is a site precast method for manufacturing a building foundation beam as a precast concrete member at a construction site. First, improve the ground below the place where the soil concrete is to be installed, level the ground surface, use this ground surface as a bed for precast concrete members, and place a side formwork on the bed. The foundation beam is manufactured by placing concrete in a recess formed by the bed and the side surface formwork.

また、本発明の請求項２に係る基礎梁のサイトプレキャスト工法は、上述した請求項１において、前記ベッドの上面側が基礎梁の長辺側となるように、前記側面型枠を前記ベッド上に配置することを特徴とする。   Further, the site precast method for a foundation beam according to claim 2 of the present invention is the above-described method according to claim 1, wherein the side formwork is placed on the bed such that the upper surface side of the bed is the long side of the foundation beam. It is characterized by arranging.

また、本発明の請求項３に係る基礎梁のサイトプレキャスト工法は、上述した請求項１または２において、前記地盤面上に緩衝部材を設け、この緩衝部材をプレキャストコンクリート部材用のベッドとして用いることを特徴とする。   Moreover, the site precast construction method of the foundation beam which concerns on Claim 3 of this invention provides a buffer member on the said ground surface in Claim 1 or 2 mentioned above, and uses this buffer member as a bed for precast concrete members. It is characterized by.

また、本発明の請求項４に係る基礎梁のサイトプレキャスト工法は、上述した請求項１〜３のいずれか一つにおいて、地盤中に予め柱鉄筋と基礎鉄筋の配筋を行っておき、前記基礎鉄筋を囲むように鋼製の基礎型枠を配置し、プレキャストコンクリート部材として製造された基礎梁の端部を前記基礎型枠の上側に配置して、前記基礎梁の端部から突き出た梁鉄筋と前記基礎型枠から上方に突き出た前記柱鉄筋とを交差させた状態とし、前記基礎梁の端部と柱との接合部と前記基礎型枠内部とを一体にコンクリート打設することを特徴とする。   Moreover, the site precast construction method of the foundation beam which concerns on Claim 4 of this invention has performed the reinforcement of a column reinforcement and a foundation reinforcement beforehand in the ground in any one of Claims 1-3 mentioned above, A beam that protrudes from the end of the foundation beam by placing a steel foundation form around the foundation rebar, placing the end of the foundation beam manufactured as a precast concrete member above the foundation formwork Reinforcing bars and the column reinforcing bars projecting upward from the foundation formwork are crossed, and concrete jointing is performed between the end part of the foundation beam and the column and the inside of the foundation formwork. Features.

本発明によれば、建築物の基礎梁をプレキャストコンクリート部材として建築現場で製造するサイトプレキャスト工法であって、土間コンクリートの設置予定箇所の下側の地盤改良を先行実施してこの地盤面を整地し、この地盤面をプレキャストコンクリート部材用のベッドとして用い、このベッド上に側面型枠を配置して、前記ベッドと前記側面型枠とによって形成される凹部にコンクリート打設して基礎梁を製造する。製造した基礎梁を現場内のクレーン等で設置予定箇所に吊り込めばよいので、コンクリートを直接打設して基礎梁を構築する方法に比べて基礎工事の工期短縮と施工性の改善とを図ることができるという効果を奏する。   According to the present invention, a site precast method for manufacturing a building foundation beam as a precast concrete member at a building site, the ground improvement on the lower side of the place where the soil concrete is to be installed is performed in advance, and the ground surface is leveled. Then, this ground surface is used as a bed for a precast concrete member, a side mold is placed on the bed, and concrete is placed in a recess formed by the bed and the side mold to produce a foundation beam. To do. It is only necessary to suspend the manufactured foundation beam at the planned installation site with a crane etc. on the site, so that the construction period of the foundation work is shortened and the workability is improved compared to the method of constructing the foundation beam by directly placing concrete. There is an effect that can be.

図１は、本発明に係る基礎梁のサイトプレキャスト工法の実施例を示す図である。FIG. 1 is a diagram showing an embodiment of a site precast method for a foundation beam according to the present invention. 図２は、ＰＣａベッド上の鉄筋の一例を示す斜視図である。FIG. 2 is a perspective view showing an example of a reinforcing bar on a PCa bed. 図３は、ＰＣａベッド上の側面型枠の一例を示す斜視図である。FIG. 3 is a perspective view showing an example of a side mold on the PCa bed. 図４は、ＰＣａ吊り込みアンカーの設置状況を示す斜視図である。FIG. 4 is a perspective view showing an installation state of the PCa suspension anchor. 図５は、ＰＣａ吊り込みアンカーの設置状況を示す上面図である。FIG. 5 is a top view showing an installation state of the PCa suspension anchor. 図６は、コッター部材の取り付け状況を示す斜視図である。FIG. 6 is a perspective view showing an attachment state of the cotter member. 図７は、コンクリート打設作業の一例を示す斜視図である。FIG. 7 is a perspective view showing an example of concrete placing work. 図８は、ＰＣａベッド上の基礎梁の一例を示す横断面図である。FIG. 8 is a cross-sectional view showing an example of the foundation beam on the PCa bed. 図９は、クレーン運搬作業の一例を示す斜視図である。FIG. 9 is a perspective view showing an example of the crane carrying work. 図１０は、地盤に埋設された基礎梁の一例を示す横断面図である。FIG. 10 is a cross-sectional view showing an example of a foundation beam embedded in the ground. 図１１は、基礎型枠および基礎梁の一例を示す正面断面図である。FIG. 11 is a front cross-sectional view showing an example of a foundation formwork and a foundation beam.

以下に、本発明に係る基礎梁のサイトプレキャスト工法の実施の形態を図面に基づいて詳細に説明する。なお、この実施例によりこの発明が限定されるものではない。   DESCRIPTION OF EMBODIMENTS Embodiments of a foundation beam site precast method according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

本発明に係る基礎梁のサイトプレキャスト工法は、建築物の基礎梁をＰＣａ部材として建築現場で製造する工法であり、土間コンクリート下の地盤改良を先行実施し、ＰＣａベッドを新設する代わりに、地盤面を整地して敷設した砂層とビニールシートをＰＣａベッドとして利用する工法である。   The site precast method of foundation beam according to the present invention is a method of manufacturing a building foundation beam as a PCa member at a construction site. The ground improvement under the soil concrete is carried out in advance, and instead of newly installing a PCa bed, the ground This is a construction method that uses a sand layer and vinyl sheet laid with the surface leveled as a PCa bed.

具体的な施工手順を説明する。
まず、図１（１）に示される土間コンクリート２の設置予定箇所の下側の地盤４に対し、図１（２）に示すように地盤改良を先行実施し、地盤改良土６の地盤面８を整地する。地盤改良後の目標圧縮強度としては例えば８００ｋＮ／ｍ２程度とすることができる。 A specific construction procedure will be described.
First, as shown in FIG. 1 (2), the ground improvement is performed in advance on the ground 4 below the planned location of the soil concrete 2 shown in FIG. 1 (1). Leveling. The target compressive strength after ground improvement can be set to, for example, about 800 kN / m 2 .

次に、図１（３）に示すように、地盤面８上に緩衝部材としての砂層１０を敷設してレベル出しを行い、ビニールシート１２を敷く。この砂層１０およびビニールシート１２をＰＣａ部材用のベッドとして利用する。   Next, as shown in FIG. 1 (3), a sand layer 10 as a buffer member is laid on the ground surface 8, leveling is performed, and a vinyl sheet 12 is laid. The sand layer 10 and the vinyl sheet 12 are used as a bed for a PCa member.

続いて、図１（４）および図２に示すように、ビニールシート１２上で鉄筋１４を配筋し、図３に示すように、この側方周囲を側面型枠１６で囲む。そして、図４および図５に示すように、側面型枠１６にＰＣａ吊り込みアンカー３０を設置する。このＰＣａ吊り込みアンカー３０は、ＰＣａ部材としての基礎梁を吊り込むために用いる係合具であり、ワイヤ等を係合可能な係合孔３０ａと棒状部３０ｂと係止部３０ｃとからなる。さらに、図６に示すように、側面型枠１６の端部内面にコッター部材３２を設ける。このコッター部材３２により、基礎梁の柱との接合面に凹形状のコッターが形成される。   Subsequently, as shown in FIG. 1 (4) and FIG. 2, a reinforcing bar 14 is arranged on the vinyl sheet 12, and as shown in FIG. Then, as shown in FIGS. 4 and 5, the PCa hanging anchor 30 is installed on the side mold 16. The PCa hanging anchor 30 is an engaging tool used to suspend a foundation beam as a PCa member, and includes an engaging hole 30a, a rod-shaped portion 30b, and a locking portion 30c that can engage a wire or the like. Further, as shown in FIG. 6, a cotter member 32 is provided on the inner surface of the end portion of the side mold 16. The cotter member 32 forms a concave cotter on the joint surface with the pillar of the foundation beam.

そして、図７に示すように、ビニールシート１２と側面型枠１６とによって形成される凹部１８にコンクリートを流し込み、コンクリートを打設する。こうすることでＰＣａ部材からなる基礎梁２０が製造される。ここで、基礎梁２０は最終的に地盤中に埋設されるため、表面が波打つなどの多少の外観の不具合があっても構わない。   And as shown in FIG. 7, concrete is poured into the recessed part 18 formed of the vinyl sheet 12 and the side surface formwork 16, and concrete is laid. By doing so, the foundation beam 20 made of the PCa member is manufactured. Here, since the foundation beam 20 is finally embedded in the ground, there may be some defects in appearance such as the surface being wavy.

また、側面型枠１６の配置については、図８に示すように、基礎梁２０を寝かせた状態に配置、つまり、ベッド（ビニールシート１２）の上面側が基礎梁２０の長辺側となるように側面型枠１６を配置すれば、型枠面積が小さくなり型枠数量を削減することができる。また、こうすることで、コンクリート打設時の施工性を改善することもできる。   Further, as shown in FIG. 8, the side formwork 16 is arranged in a state in which the foundation beam 20 is laid down, that is, the upper surface side of the bed (vinyl sheet 12) is the long side of the foundation beam 20. If the side mold 16 is disposed, the mold area is reduced and the number of molds can be reduced. Moreover, the workability at the time of concrete placement can also be improved by carrying out like this.

製造した基礎梁２０は、図９および図１０に示すように、設置予定箇所の溝２２内にクレーン２４等で吊り込む。このように、製造した基礎梁を現場内のクレーン等で設置予定箇所に吊り込めばよいので、コンクリートを直接打設して基礎梁を構築する方法に比べて基礎工事の工期短縮と施工性の改善とを図ることができる。また、ＰＣａ部材からなる基礎梁を、工場でなく基礎梁の設置予定箇所の直近で製造することにより、部材の運搬費用を削減することができる。   As shown in FIGS. 9 and 10, the manufactured foundation beam 20 is suspended by a crane 24 or the like in a groove 22 at a planned installation location. In this way, it is only necessary to suspend the manufactured foundation beam at the site where it is to be installed with a crane etc. on the site. Improvement. Moreover, the transportation cost of a member can be reduced by manufacturing the foundation beam which consists of PCa members in the immediate vicinity of the installation planned location of a foundation beam instead of a factory.

ここで、ＰＣａ部材として製造した基礎梁と基礎との接合については、次のような方法により施工性等を改善することができる。つまり、図１１に示すように、地盤４中に予め柱３８用の柱主筋３４（柱鉄筋）とその基礎鉄筋４０の配筋を行っておき、基礎鉄筋４０を囲むように鋼製の基礎型枠２６を配置する。ここで、柱主筋３４が所定の位置に配するように、固定用の金物（不図示）を設置しておく。   Here, about the joining of the foundation beam manufactured as a PCa member and a foundation, workability etc. can be improved with the following method. That is, as shown in FIG. 11, the bar main bar 34 (column reinforcing bar) for the column 38 and the base reinforcing bar 40 are arranged in advance in the ground 4, and the steel base mold is formed so as to surround the basic reinforcing bar 40. A frame 26 is arranged. Here, a fixing hardware (not shown) is installed so that the pillar main bars 34 are arranged at predetermined positions.

次に、プレキャストコンクリート部材として製造された基礎梁２０の端部を基礎型枠２６の上側に配置し、基礎梁２０の端部から突き出た梁主筋３６（梁鉄筋）と基礎型枠２６から上方に突き出た柱主筋３４とが交差した状態にする。ここで、図１１のように基礎梁２０の端部同士を対向配置する場合には、突き合わされた梁主筋３６どうしは図示しない機械式継手で接合する。続いて、基礎梁２０の端部と柱３８との接合部２８と基礎型枠２６内部とを一体にコンクリート打設する。こうすることで、コンクリート打設時の施工性を改善し、基礎工事の工期短縮を図ることができる。また、前述のように、柱主筋の位置ずれを気にする必要もない。   Next, the end portion of the foundation beam 20 manufactured as a precast concrete member is disposed on the upper side of the foundation formwork 26, and the main beam 36 (beam reinforcement) protruding from the end portion of the foundation beam 20 and the upper side from the foundation formwork 26. The column main reinforcement 34 protruding in the crossing is made to be in a crossed state. Here, when the ends of the foundation beam 20 are arranged to face each other as shown in FIG. 11, the butted beam main bars 36 are joined by a mechanical joint (not shown). Subsequently, the joint portion 28 between the end portion of the foundation beam 20 and the column 38 and the inside of the foundation mold frame 26 are integrally cast. By doing so, it is possible to improve the workability at the time of placing concrete and to shorten the work period of the foundation work. In addition, as described above, it is not necessary to worry about the positional deviation of the column main bars.

以上説明したように、本発明によれば、建築物の基礎梁をプレキャストコンクリート部材として建築現場で製造するサイトプレキャスト工法であって、土間コンクリートの設置予定箇所の下側の地盤改良を先行実施してこの地盤面を整地し、この地盤面をプレキャストコンクリート部材用のベッドとして用い、このベッド上に側面型枠を配置して、前記ベッドと前記側面型枠とによって形成される凹部にコンクリート打設して基礎梁を製造する。製造した基礎梁を現場内のクレーン等で設置予定箇所に吊り込めばよいので、コンクリートを直接打設して基礎梁を構築する方法に比べて基礎工事の工期短縮と施工性の改善とを図ることができる。   As described above, according to the present invention, it is a site precast method for manufacturing a building foundation beam as a precast concrete member at a construction site. Leveling the ground surface of the lever, using the ground surface as a bed for a precast concrete member, placing a side mold on the bed, and placing concrete in a recess formed by the bed and the side mold To manufacture foundation beams. It is only necessary to suspend the manufactured foundation beam at the planned installation site with a crane etc. on the site, so that the construction period of the foundation work is shortened and the workability is improved compared to the method of constructing the foundation beam by directly placing concrete. be able to.

以上のように、本発明に係る基礎梁のサイトプレキャスト工法は、建築物の基礎工事に有用であり、特に、建築現場でＰＣａ部材を製作できる程度に敷地に余裕がある場合に適している。   As described above, the site precast method for foundation beams according to the present invention is useful for building foundation work, and is particularly suitable when there is room in the site to the extent that a PCa member can be produced at a construction site.

２ 土間コンクリート
４ 地盤
６ 地盤改良土
８ 地盤面
１０ 砂層（緩衝部材）
１２ ビニールシート（緩衝部材）
１４ 鉄筋
１６ 側面型枠
１８ 凹部
２０ 基礎梁
２２ 溝
２４ クレーン
２６ 基礎型枠
２８ 接合部
３０ ＰＣａ吊り込みアンカー
３２ コッター部材
３４ 柱主筋（柱鉄筋）
３６ 梁主筋（梁鉄筋）
３８ 柱
４０ 基礎鉄筋 2 Ground concrete 4 Ground 6 Ground improvement soil 8 Ground surface 10 Sand layer (buffer member)
12 Vinyl sheet (buffer member)
DESCRIPTION OF SYMBOLS 14 Reinforcement 16 Side formwork 18 Recess 20 Foundation beam 22 Groove 24 Crane 26 Foundation formwork 28 Joint 30 PCa suspension anchor 32 Cotter member 34 Column main reinforcement (column reinforcement)
36 Beam reinforcement (beam reinforcement)
38 pillars 40 foundation rebar

Claims (4)

建築物の基礎梁をプレキャストコンクリート部材として建築現場で製造するサイトプレキャスト工法であって、
土間コンクリートの設置予定箇所の下側の地盤改良を先行実施してこの地盤面を整地し、この地盤面をプレキャストコンクリート部材用のベッドとして用い、このベッド上に側面型枠を配置して、前記ベッドと前記側面型枠とによって形成される凹部にコンクリート打設して基礎梁を製造することを特徴とする基礎梁のサイトプレキャスト工法。 A site precast method of manufacturing a building foundation beam as a precast concrete member at a construction site,
Prior to the ground improvement on the lower side of the place where soil concrete is to be installed, this ground surface is leveled, this ground surface is used as a bed for precast concrete members, a side formwork is placed on this bed, A foundation beam site precast method, wherein a foundation beam is manufactured by placing concrete in a recess formed by a bed and the side formwork. 前記ベッドの上面側が基礎梁の長辺側となるように、前記側面型枠を前記ベッド上に配置することを特徴とする請求項１に記載の基礎梁のサイトプレキャスト工法。   2. The site precast method for a foundation beam according to claim 1, wherein the side surface formwork is arranged on the bed so that an upper surface side of the bed is a long side of the foundation beam. 前記地盤面上に緩衝部材を設け、この緩衝部材をプレキャストコンクリート部材用のベッドとして用いることを特徴とする請求項１または２に記載の基礎梁のサイトプレキャスト工法。   The site precast method for foundation beams according to claim 1 or 2, wherein a buffer member is provided on the ground surface, and the buffer member is used as a bed for a precast concrete member. 地盤中に予め柱鉄筋と基礎鉄筋の配筋を行っておき、前記基礎鉄筋を囲むように鋼製の基礎型枠を配置し、プレキャストコンクリート部材として製造された基礎梁の端部を前記基礎型枠の上側に配置して、前記基礎梁の端部から突き出た梁鉄筋と前記基礎型枠から上方に突き出た前記柱鉄筋とを交差させた状態とし、前記基礎梁の端部と柱との接合部と前記基礎型枠内部とを一体にコンクリート打設することを特徴とする請求項１〜３のいずれか一つに記載の基礎梁のサイトプレキャスト工法。   Column reinforcement and foundation reinforcement are placed in the ground in advance, a steel foundation formwork is placed around the foundation reinforcement, and the end of the foundation beam manufactured as a precast concrete member is placed in the foundation mold. Arranged on the upper side of the frame, the beam reinforcement protruding from the end of the foundation beam and the column reinforcement protruding upward from the foundation mold are crossed, and the end of the foundation beam and the column The site precast method for a foundation beam according to any one of claims 1 to 3, wherein the joint portion and the inside of the foundation formwork are integrally cast into concrete.
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