JP2020147974A - Construction method of building foundation, and partition frame - Google Patents

Construction method of building foundation, and partition frame Download PDF

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JP2020147974A
JP2020147974A JP2019045615A JP2019045615A JP2020147974A JP 2020147974 A JP2020147974 A JP 2020147974A JP 2019045615 A JP2019045615 A JP 2019045615A JP 2019045615 A JP2019045615 A JP 2019045615A JP 2020147974 A JP2020147974 A JP 2020147974A
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partition frame
pile head
building foundation
pile
ground
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JP7338995B2 (en
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将憲 菅
Masanori Suga
将憲 菅
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Daiwa House Industry Co Ltd
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Daiwa House Industry Co Ltd
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Abstract

To provide a construction method of a building foundation which can eliminate the need to install leveling concrete between a pile head of a pile-like ground reinforcement body driven into a ground and a bottom face side of a building foundation, and to provide a partition frame capable of being used in the construction method of a building foundation.SOLUTION: A construction method of a building foundation includes the steps of: exposing a pile head 21 of a pile-like ground reinforcement body 2 driven into a ground; disposing a partition frame 100 forming a pile head space 31 for concrete installation at an upper side of the pile head 21; laying crushed stone 4 at a peripheral side of the partition frame 100 and fastening; providing a formwork 5 of a building foundation in a region including the pile head space 31; and installing concrete into the formwork 5 manufacturing the building foundation and into the pile head space 31.SELECTED DRAWING: Figure 1

Description

この発明は、地盤に打ち込んだ杭状地盤補強体の上側に建物基礎を施工する建物基礎の施工方法およびこの建物基礎の施工方法に用いることができる仕切り枠に関する。 The present invention relates to a method of constructing a building foundation in which a building foundation is constructed on the upper side of a pile-shaped ground reinforcing body driven into the ground, and a partition frame that can be used in the method of constructing the building foundation.

従来より、軟弱地盤における建物の不同沈下を防止するために、鋼管杭或いはコンクリート系杭等の杭状地盤補強体を地盤に打ち込む杭状地盤補強法が行われている。また、上記杭状地盤補強体上にコンクリート建物基礎を施工する従来の方法においては、上記杭状地盤補強体の杭頭レベルの施工誤差の影響を無くすために、上記杭頭と上記コンクリート建物基礎のフーチング部の間に捨てコンクリートを打設することも行われていた。 Conventionally, in order to prevent uneven settlement of buildings on soft ground, a pile-shaped ground reinforcement method in which a pile-shaped ground reinforcing body such as a steel pipe pile or a concrete-based pile is driven into the ground has been performed. Further, in the conventional method of constructing the concrete building foundation on the pile-shaped ground reinforcing body, in order to eliminate the influence of the construction error at the pile head level of the pile-shaped ground reinforcing body, the pile head and the concrete building foundation are eliminated. It was also practiced to place abandoned concrete between the footing parts of the building.

なお、特許文献１には、軟弱地盤の地表から硬質な支持地盤まで、複数の鋼管杭を打設する鋼管杭打設工程と、打設されたこれらの鋼管杭の上端位置が均等となるよう該鋼管杭の上端側を切断する鋼管杭切断工程と、上記各鋼管杭にＨ型鋼を水平に固定するＨ型鋼固定工程と、を備える軟弱地盤の改良工法が開示されている。 In addition, in Patent Document 1, the steel pipe pile driving step of driving a plurality of steel pipe piles from the ground surface of soft ground to the hard supporting ground and the upper end positions of these driven steel pipe piles are made equal. A method for improving soft ground including a steel pipe pile cutting step of cutting the upper end side of the steel pipe pile and an H-shaped steel fixing step of horizontally fixing the H-shaped steel to each of the steel pipe piles is disclosed.

特開２００４−６０３６３号公報Japanese Unexamined Patent Publication No. 2004-60363

しかしながら、上記杭頭と上記コンクリート建物基礎のフーチング部の間に捨てコンクリートを打設するためには、この捨てコンクリートの打設のためのポンプ車が建設現場に必要となり、施工コストが高くなる問題がある。また、上記杭状地盤補強体の支持力上昇に伴って捨てコンクリートの支持力を高くしようとすると、捨てコンクリートの粘度が高くなり、捨てコンクリートを型枠内で円滑に流動させることが難しくなる。 However, in order to place waste concrete between the pile head and the footing portion of the concrete building foundation, a pump truck for placing the waste concrete is required at the construction site, which increases the construction cost. There is. Further, if an attempt is made to increase the bearing capacity of the waste concrete as the bearing capacity of the pile-shaped ground reinforcing body increases, the viscosity of the waste concrete increases, and it becomes difficult for the waste concrete to flow smoothly in the formwork.

この発明は、上記の事情に鑑み、地盤に打ち込んだ杭状地盤補強体の杭頭と建物基礎の底面側との間に捨てコンクリートを打設することを不要にできる建物基礎の施工方法、並びにこの建物基礎の施工方法において用いることができる仕切り枠を提供することを課題とする。 In view of the above circumstances, the present invention provides a method for constructing a building foundation that can eliminate the need for placing discarded concrete between the pile head of a pile-shaped ground reinforcing body driven into the ground and the bottom side of the building foundation. An object of the present invention is to provide a partition frame that can be used in the construction method of the building foundation.

この発明の建物基礎の施工方法は、上記の課題を解決するために、地盤に打ち込まれた杭状地盤補強体の杭頭を露呈させる工程と、上記杭頭の上側にコンクリート打設用の杭頭上空間を形成する仕切り枠を配置する工程と、上記仕切り枠の周囲側に砕石を敷いて締め固める工程と、上記杭頭上空間を含む領域に建物基礎の型枠を設ける工程と、上記型枠内および上記杭頭上空間内にコンクリートを打設する工程と、を含むことを特徴とする。 In the construction method of the building foundation of the present invention, in order to solve the above-mentioned problems, a step of exposing the pile head of the pile-shaped ground reinforcing body driven into the ground and a pile for concrete placement on the upper side of the pile head The process of arranging the partition frame that forms the overhead space, the process of laying crushed stone on the peripheral side of the partition frame and compacting it, the process of providing the mold of the building foundation in the area including the pile overhead space, and the above-mentioned mold. It is characterized by including a step of placing concrete in the inside and in the space above the pile head.

上記の方法であれば、上記建物基礎を作製する型枠内および上記杭頭上空間内に建物基礎用のコンクリートが打設されるので、建物基礎と同時に上記杭頭上空間内において上記建物基礎と一体に杭頭上コンクリート部が形成される。これにより、捨てコンクリートを用いなくても上記杭頭のレベルの施工誤差の影響を無くすことができる。すなわち、上記建物基礎の底面側に対して杭頭レベルに誤差が生じた場合、この誤差に対しては上記杭頭上コンクリート部の厚みが変化することで対応できる。そして、捨てコンクリートを用いなくてもよいため、建物基礎の作製容易化およびコスト低減を図ることができる。なお、かかる方法により作製された建物基礎においては、上記杭頭上コンクリート部に杭状地盤補強体の杭頭は入り込まず、建物基礎は上記杭頭上コンクリート部を介して上記杭頭上で横滑り可能に置かれ、地震による上記杭頭の曲げ負担を軽減する構造となる。 With the above method, concrete for the building foundation is placed in the mold for producing the building foundation and in the space above the pile head, so that it is integrated with the building foundation in the space above the pile head at the same time as the building foundation. A concrete part above the pile head is formed in. As a result, it is possible to eliminate the influence of the construction error at the level of the pile head without using waste concrete. That is, when an error occurs in the pile head level with respect to the bottom surface side of the building foundation, this error can be dealt with by changing the thickness of the concrete portion above the pile head. Further, since it is not necessary to use waste concrete, it is possible to facilitate the production of the building foundation and reduce the cost. In the building foundation produced by such a method, the pile head of the pile-shaped ground reinforcing body does not enter the concrete portion above the pile head, and the building foundation is placed so as to be skidable on the pile head via the concrete portion above the pile head. The structure is such that the bending load of the pile head due to the earthquake is reduced.

上記仕切り枠の内周部が上記杭頭の周囲縁から離れていてもよい。これによれば、上記杭頭上コンクリート部の外形が上記杭頭の外形よりも大きくなるので、地震等で上記杭頭と上記杭頭上コンクリート部との接触箇所がずれたとしても、上記杭頭の上面全体が上記杭頭上コンクリート部に接触する状態を保つことが可能になる。 The inner peripheral portion of the partition frame may be separated from the peripheral edge of the pile head. According to this, since the outer shape of the concrete portion above the pile head is larger than the outer shape of the pile head, even if the contact point between the pile head and the concrete portion above the pile head shifts due to an earthquake or the like, the outer shape of the pile head It is possible to keep the entire upper surface in contact with the concrete portion above the pile head.

また、この発明の仕切り枠は、地盤に打ち込まれた杭状地盤補強体の杭頭の周囲側に敷かれる砕石が杭頭側に入り込むのを止めるとともに上記杭頭上に打設されるコンクリートが上記砕石側に流れるのを止める立上壁を有することを特徴とする。 Further, in the partition frame of the present invention, the crushed stone laid on the peripheral side of the pile head of the pile-shaped ground reinforcing body driven into the ground is stopped from entering the pile head side, and the concrete placed on the pile head is described above. It is characterized by having a rising wall that stops the flow to the crushed stone side.

上記の仕切り枠を建物基礎の作製に用いることで、この建物基礎の一部をなすコンクリート部を上記杭頭上に的確に造ることができる。 By using the above partition frame for manufacturing the building foundation, the concrete portion forming a part of the building foundation can be accurately constructed on the pile head.

また、上記仕切り枠は、上記立上壁の下側縁から外方向に突出する外側突出部を備えてもよい。これによれば、当該仕切り枠の周囲側に敷かれた砕石で上記外側突出部が下側に押さえ付けられるため、上記砕石を締め固める際の振動によって上記仕切り枠が浮き上がって外れるのを抑制することができる。また、上記仕切り枠が変形しやすい樹脂材料等からなっていても、上記外側突出部によって上記立上壁の下部側の変形が防止されるため、上記の締め固められる砕石で上記立上壁の上側に圧力がかかっても、この立上壁の上側の変形が抑制される。 Further, the partition frame may include an outer protruding portion that protrudes outward from the lower edge of the rising wall. According to this, since the outer protrusion is pressed downward by the crushed stone laid on the peripheral side of the partition frame, it is possible to prevent the partition frame from being lifted and detached by the vibration when compacting the crushed stone. be able to. Further, even if the partition frame is made of a easily deformable resin material or the like, the outer protrusion prevents the lower side of the rising wall from being deformed, so that the crushed stone to be compacted can be used to cover the rising wall. Even if pressure is applied to the upper side, deformation of the upper side of the rising wall is suppressed.

上記仕切り枠においては、上記立上壁と上記外側突出部とに接続されるリブ部を備えてもよい。これによれば、上記立上壁のさらなる変形抑制効果が得られる。 The partition frame may be provided with a rib portion connected to the rising wall and the outer protruding portion. According to this, a further effect of suppressing deformation of the rising wall can be obtained.

上記仕切り枠においては、当該仕切り枠を地面に固定する固定部を有するか、または当該仕切り枠を地面に固定する固定部材が装着される固定部材装着部を有していてもよい。これによれば、上記固定部または別途装着される固定部材によって、上記仕切り枠を地面側に固定できるので、上記仕切り枠はさらに浮き上がり難くなる。 The partition frame may have a fixing portion for fixing the partition frame to the ground, or may have a fixing member mounting portion on which a fixing member for fixing the partition frame to the ground is mounted. According to this, since the partition frame can be fixed to the ground side by the fixing portion or the fixing member separately attached, the partition frame is more difficult to lift.

また、上記仕切り枠は、上記立上壁の上部側の外形状が当該立上壁の下部側の内形状よりも小さくされており、上記立上壁の上部側が、別の仕切り枠の立上壁の下部側内に嵌るようになっていてもよい。これによれば、複数の仕切り枠を積み上げるときに、上下の仕切り枠を部分的に重ね合わせることができるので、積み上げの嵩を低くすることができる。 Further, in the partition frame, the outer shape of the upper side of the rising wall is smaller than the inner shape of the lower side of the rising wall, and the upper side of the rising wall is the rising of another partition frame. It may fit inside the lower side of the wall. According to this, when a plurality of partition frames are stacked, the upper and lower partition frames can be partially overlapped, so that the volume of stacking can be reduced.

本発明の建物基礎の施工方法であれば、地盤に打ち込んだ杭状地盤補強体の杭頭と建物基礎の底面側との間に捨てコンクリートを打設することが不要になるので、基礎施工の容易化および施工コストの低減が図れる。また、本発明の仕切り枠を建物基礎の作製に用いることで、この建物基礎の一部をなすコンクリート部を上記杭頭上に的確に造ることができる。 According to the construction method of the building foundation of the present invention, it is not necessary to place discarded concrete between the pile head of the pile-shaped ground reinforcement body driven into the ground and the bottom surface side of the building foundation. It can be simplified and the construction cost can be reduced. Further, by using the partition frame of the present invention for manufacturing a building foundation, a concrete portion forming a part of the building foundation can be accurately constructed on the pile head.

本発明の実施形態に係る建物基礎の施工方法を示した説明図である。It is explanatory drawing which showed the construction method of the building foundation which concerns on embodiment of this invention. 同図（Ａ）は図１の建物基礎の施工方法により作製された建物基礎の断面図、同図（Ｂ）は同平面図である。FIG. 3A is a cross-sectional view of a building foundation produced by the construction method of the building foundation of FIG. 1, and FIG. 1B is a plan view of the same. 本発明の実施形態に係る仕切り枠を示した斜視図である。It is a perspective view which showed the partition frame which concerns on embodiment of this invention. 図３の仕切り枠を上下に２個重ねたときの一部分を示した断面図である。It is sectional drawing which showed the part when two partition frames of FIG. 3 are stacked up and down. 本発明の他の実施形態に係る仕切り枠を示した斜視図である。It is a perspective view which showed the partition frame which concerns on other embodiment of this invention. 図５の仕切り枠が砕石によって下側に押さえ付けられる状態および仕切り枠が釘状物で地面に固定された状態を示した説明図である。FIG. 5 is an explanatory view showing a state in which the partition frame of FIG. 5 is pressed downward by crushed stone and a state in which the partition frame is fixed to the ground with a nail-like object. 本発明の他の実施形態に係る仕切り枠を示した斜視図である。It is a perspective view which showed the partition frame which concerns on other embodiment of this invention. 本発明の他の実施形態に係る仕切り枠を示した斜視図である。It is a perspective view which showed the partition frame which concerns on other embodiment of this invention.

以下、この発明の実施の形態の建物基礎の施工方法を添付図面に基づいて説明する。図１（ａ）に示すように、杭状地盤補強体２を地盤に打ち込んで土を被せておいた建設現場でこの土を掘り起こす作業（根伐り）を行う。この作業では、杭状地盤補強体２における杭頭２１の上端面が根伐り底と面一になるように、土を掘り起こす。また、この作業によって、建設現場に存在する複数の杭状地盤補強体２の杭頭２１が露呈されるとともに、建物基礎のフーチング部用の溝掘り部３が形成される。なお、上記杭状地盤補強体２としては、鋼管杭、コンクリート杭等が用いられる。また、鋼管杭では杭頭２１に杭頭キャップが設けられる。 Hereinafter, a method of constructing a building foundation according to an embodiment of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1 (a), the work (root cutting) of digging up this soil is performed at a construction site where the pile-shaped ground reinforcing body 2 is driven into the ground and covered with soil. In this work, the soil is dug up so that the upper end surface of the pile head 21 in the pile-shaped ground reinforcing body 2 is flush with the root cutting bottom. Further, by this work, the pile heads 21 of the plurality of pile-shaped ground reinforcing bodies 2 existing at the construction site are exposed, and the groove digging portion 3 for the footing portion of the building foundation is formed. As the pile-shaped ground reinforcing body 2, a steel pipe pile, a concrete pile, or the like is used. Further, in the case of steel pipe piles, a pile head cap is provided on the pile head 21.

次に、同図の（ｂ）に示すように、上記杭状地盤補強体２の杭頭２１を囲うように上記根伐り底上に仕切り枠１００を配置する。このとき、上記杭頭２１を上記仕切り枠１００の中心に位置させる。なお、上記仕切り枠１００は、例えば、丸形鋼管を７０ｍｍ程度の長さで切り出すことで作製できる。上記仕切り枠１００を配置したことにより、上記杭頭２１の上側には、上記仕切り枠１００で囲われる杭頭上空間３１が形成されることになる。また、上記仕切り枠１００は、当該仕切り枠１００の内周部と上記杭頭２１の周囲縁との間に、例えば、３０ｍｍ以上の距離が確保される内径を有する。 Next, as shown in (b) of the figure, the partition frame 100 is arranged on the root cutting bottom so as to surround the pile head 21 of the pile-shaped ground reinforcing body 2. At this time, the pile head 21 is positioned at the center of the partition frame 100. The partition frame 100 can be manufactured, for example, by cutting out a round steel pipe with a length of about 70 mm. By arranging the partition frame 100, a space 31 above the pile head surrounded by the partition frame 100 is formed on the upper side of the pile head 21. Further, the partition frame 100 has an inner diameter that ensures a distance of, for example, 30 mm or more between the inner peripheral portion of the partition frame 100 and the peripheral edge of the pile head 21.

次に、同図の（ｃ）に示すように、上記仕切り枠１００内を除く上記根伐り底上に砕石４を敷いて、この砕石４をランマーまたはコンパクターで締め固める。このとき、上記仕切り枠１００は、上記杭頭上空間３１への上記砕石４の入り込みを止めるように機能する。また、上記砕石４の締め固めが行われるときに、同図の（ｄ）に示すように、上記仕切り枠１００の下部が根伐り底の下側に入り込むことで、この仕切り枠１００の地面への固定が行われる。また、上記仕切り枠１００内で上記杭頭２１よりも地面が下がった場所では、上記杭頭２１と面一となる高さまで土４１を補充する。なお、上記砕石４の締め固め作業は、直接基礎における砕石地業の基準に準じて行う。上記砕石４の上レベルが建物基礎の底の基準になる Next, as shown in (c) of the figure, a crushed stone 4 is laid on the root cutting bottom except the inside of the partition frame 100, and the crushed stone 4 is compacted with a rammer or a compactor. At this time, the partition frame 100 functions to stop the crushed stone 4 from entering the space above the pile head. Further, when the crushed stone 4 is compacted, as shown in (d) of the figure, the lower portion of the partition frame 100 enters the lower side of the root cutting bottom to reach the ground of the partition frame 100. Is fixed. Further, in the place where the ground is lower than the pile head 21 in the partition frame 100, the soil 41 is replenished to a height flush with the pile head 21. The compaction work of the crushed stone 4 is performed in accordance with the standard of the crushed stone ground industry in the direct foundation. The upper level of the above crushed stone 4 becomes the standard for the bottom of the building foundation.

上記砕石４の締め固め作業の後、上記杭頭上空間３１を含む領域に建物基礎を作製するための型枠５を設ける。この型枠５内には図示しない配筋が設けられる。 After the compaction work of the crushed stone 4, a formwork 5 for forming a building foundation is provided in the area including the space above the pile head. Reinforcing bars (not shown) are provided in the formwork 5.

次に、上記型枠５内および上記杭頭上空間３１内にコンクリート（生コンクリート）を打設する。このコンクリートの打設により、図２（Ａ）および図２（Ｂ）に示すように、建物基礎６が作製される。この建物基礎６は、フーチング部６１上に立ち上げ部６２を有し、また、フーチング部６１の下側に杭頭上コンクリート部６３を有するものとなる。すなわち、上記杭頭上空間３１内にも建物基礎６用のコンクリートが打設されることで、上記建物基礎６の作製と同時に上記杭頭上空間３１内において建物基礎６と一体で杭頭上コンクリート部６３が形成される。この打設時においては、上記仕切り枠１００は上記コンクリートが枠外に流れるのを阻止する。 Next, concrete (ready-mixed concrete) is placed in the formwork 5 and the space above the pile head. By placing this concrete, the building foundation 6 is produced as shown in FIGS. 2 (A) and 2 (B). The building foundation 6 has a rising portion 62 on the footing portion 61 and a pile head concrete portion 63 below the footing portion 61. That is, by placing concrete for the building foundation 6 also in the pile head space 31, the pile head concrete portion 63 is integrated with the building foundation 6 in the pile head space 31 at the same time as the building foundation 6 is manufactured. Is formed. At the time of this casting, the partition frame 100 prevents the concrete from flowing out of the frame.

そして、上記建物基礎６の養生後に型枠５を取り外し、上記フーチング部６１の周囲に土を被せる。なお、上記建物基礎６および上記杭状地盤補強体２を備える基礎構造は、当該杭状地盤補強体２の杭頭２１が建物基礎６の底面側において上記杭頭上コンクリート部６３内に入り込まず、建物基礎６が上記杭頭上コンクリート部６３を介して上記杭頭２１上に横滑り可能に置かれ、地震による上記杭頭２１の曲げ負担を軽減する構造となる。また、上記仕切り枠１００によって、上記杭頭上に建物基礎の一部をなすコンクリート部、すなわち、上記の杭頭上コンクリート部６３を的確に造ることができる。上記仕切り枠１００は、上記フーチング部６１の下側に残置される。 Then, after curing the building foundation 6, the formwork 5 is removed, and the footing portion 61 is covered with soil. In the foundation structure including the building foundation 6 and the pile-shaped ground reinforcing body 2, the pile head 21 of the pile-shaped ground reinforcing body 2 does not enter the concrete portion 63 above the pile head on the bottom surface side of the building foundation 6. The building foundation 6 is placed on the pile head 21 so as to be skidable via the concrete portion 63 above the pile head, and has a structure that reduces the bending load of the pile head 21 due to an earthquake. Further, the partition frame 100 can accurately form a concrete portion forming a part of the building foundation on the pile head, that is, the concrete portion 63 on the pile head. The partition frame 100 is left behind the footing portion 61.

上記建物基礎の施工方法であれば、建物基礎６を作製する型枠５内および杭頭上空間３１内に建物基礎用のコンクリートが打設されるので、建物基礎６と同時に上記杭頭上空間３１内において上記建物基礎６と一体の上記の杭頭上コンクリート部６３が形成される。これにより、捨てコンクリートを用いなくても上記杭頭２１のレベルの施工誤差の影響を無くすことができる。すなわち、上記建物基礎６の底面側に対する杭頭レベルに誤差が生じた場合、この誤差に対しては、上記杭頭上コンクリート部６３の厚みが変化することで対応できる。そして、捨てコンクリートを用いなくてもよいため、建物基礎の作製容易化およびコスト低減を図ることができる。 According to the construction method of the building foundation, concrete for the building foundation is placed in the mold 5 for producing the building foundation 6 and in the space above the pile head, so that the concrete for the building foundation is placed in the space above the pile head 6 at the same time as the building foundation 6. In, the above-mentioned pile head concrete portion 63 integrated with the above-mentioned building foundation 6 is formed. As a result, the influence of the construction error at the level of the pile head 21 can be eliminated without using waste concrete. That is, when an error occurs in the pile head level with respect to the bottom surface side of the building foundation 6, this error can be dealt with by changing the thickness of the concrete portion 63 above the pile head. Further, since it is not necessary to use waste concrete, it is possible to facilitate the production of the building foundation and reduce the cost.

また、上記仕切り枠１００を用いた上記施工方法においては、当該仕切り枠１００の内周部が上記杭頭２１の周囲縁から離れており、上記杭頭上コンクリート部６３の外形（外径）が上記杭頭２１の外形（外径）よりも大きくなるので、地震等で上記杭頭２１と上記杭頭上コンクリート部６３との接触箇所がずれたとしても、上記杭頭２１の上面全体が上記杭頭上コンクリート部６３に接触する状態を保つことが可能になる。 Further, in the construction method using the partition frame 100, the inner peripheral portion of the partition frame 100 is separated from the peripheral edge of the pile head 21, and the outer shape (outer diameter) of the concrete portion 63 above the pile head is the above. Since it is larger than the outer shape (outer diameter) of the pile head 21, the entire upper surface of the pile head 21 is above the pile head even if the contact points between the pile head 21 and the concrete portion 63 above the pile head are displaced due to an earthquake or the like. It becomes possible to keep the state of contact with the concrete portion 63.

次に、図３および図４を参照して、この実施形態の樹脂製の仕切り枠１について説明していく。この仕切り枠１は、上記杭状地盤補強体２の杭頭２１の周囲側に敷かれる砕石４が杭頭２１側に入り込むのを止めるとともに上記杭頭２１上に打設されるコンクリートが上記砕石４側に流れるのを止める立上壁１１を備える。また、上記立上壁１１は、大きさが互いに異なる下側壁部（下側部）１１ａおよび上側壁部（上側部）１１ｂを有しており、下側壁部１１ａの内径は上側壁部１１ｂの外径よりも大きくなっている。上記下側壁部１１ａの肉厚と上記上側壁部１１ｂの肉厚は同じである。 Next, the resin partition frame 1 of this embodiment will be described with reference to FIGS. 3 and 4. In this partition frame 1, the crushed stone 4 laid on the peripheral side of the pile head 21 of the pile-shaped ground reinforcing body 2 is stopped from entering the pile head 21 side, and the concrete placed on the pile head 21 is the crushed stone. A rising wall 11 for stopping the flow to the 4 side is provided. Further, the rising wall 11 has a lower side wall portion (lower side portion) 11a and an upper side wall portion (upper side portion) 11b having different sizes, and the inner diameter of the lower side wall portion 11a is the upper side wall portion 11b. It is larger than the outer diameter. The wall thickness of the lower side wall portion 11a and the wall thickness of the upper side wall portion 11b are the same.

このような構造を有する仕切り枠１は、当該仕切り枠１の上側壁部１１ｂ上に、別の仕切り枠１の下側壁部１１ａを嵌め込むことが可能となる。このため、複数の仕切り枠１を積み上げるときに、上側の仕切り枠１の下側壁部１１ａを下側の仕切り枠１の上側壁部１１ｂに重ね合わせて、積み上げの嵩を低くすることができる。上記仕切り枠１は樹脂製で軽量であるので、仕切り枠１を多く積み重ねることが可能になる。なお、上記仕切り枠１用の樹脂としては、土中において微生物の働きにより水と二酸化炭素に分解される生分解性樹脂を用いることができる。 The partition frame 1 having such a structure can fit another lower side wall portion 11a of the partition frame 1 on the upper side wall portion 11b of the partition frame 1. Therefore, when a plurality of partition frames 1 are stacked, the lower side wall portion 11a of the upper partition frame 1 can be overlapped with the upper side wall portion 11b of the lower partition frame 1 to reduce the stacking volume. Since the partition frame 1 is made of resin and is lightweight, many partition frames 1 can be stacked. As the resin for the partition frame 1, a biodegradable resin that is decomposed into water and carbon dioxide by the action of microorganisms in the soil can be used.

ここで、上記建物基礎の施工において、上記の鋼管からなる仕切り枠１００を用いる場合であれば、上記砕石４の締め固めが行われるときに、上記仕切り枠１００の浮き上がりが生じることはないが、上記の樹脂等からなる軽量の仕切り枠１を用いて上記建物基礎の施工を行う場合には、上記砕石４の締め固めが行われるときに、ランマー等が発生する振動によって、上記仕切り枠１が浮き上がって外れることがある。 Here, when the partition frame 100 made of the steel pipe is used in the construction of the building foundation, the partition frame 100 does not rise when the crushed stone 4 is compacted. When the building foundation is constructed using the lightweight partition frame 1 made of the resin or the like, the partition frame 1 is moved by the vibration generated by the rammer or the like when the crushed stone 4 is compacted. It may come up and come off.

そこで、上記仕切り枠１における上記の浮き上がりが生じないように、上記建物基礎６の施工において、図５に示す仕切り枠１Ａを用いるようにしてもよい。この仕切り枠１Ａは、上記仕切り枠１と同様に、上記砕石４が杭頭２１側に入り込むのを止めるとともに上記杭頭２１上に打設されるコンクリートが上記砕石４側に流れるのを止める立上壁１１を有しており、さらに、上記立上壁１１の下側縁に外方向に水平に突出するリング状の外側突出部１２を有している。また、上記外側突出部１２には、固定部材としての釘状物（ペグ等）１５を土中に打ち込むための固定部材装着部となる貫通孔部１２ａが複数形成されている。 Therefore, the partition frame 1A shown in FIG. 5 may be used in the construction of the building foundation 6 so that the above-mentioned lift in the partition frame 1 does not occur. Similar to the partition frame 1, the partition frame 1A stops the crushed stone 4 from entering the pile head 21 side and stops the concrete placed on the pile head 21 from flowing to the crushed stone 4 side. It has an upper wall 11, and further has a ring-shaped outer protrusion 12 that horizontally protrudes outward on the lower edge of the rising wall 11. Further, the outer protruding portion 12 is formed with a plurality of through-hole portions 12a serving as fixing member mounting portions for driving a nail-shaped object (peg or the like) 15 as a fixing member into the soil.

上記仕切り枠１Ａであれば、図６に示すように、当該仕切り枠１Ａの周囲側に敷かれている砕石４で上記外側突出部１２が下方に押さえ付けられるため、上記砕石４が締め固められる際の振動によって上記仕切り枠１Ａが浮き上がってくるのを抑制することができる。また、上記仕切り枠１Ａが、変形しやすい樹脂からなっていても、上記外側突出部１２によって上記立上壁１１の下側壁部１１ａの変形が防止されるため、上記砕石４によって上記立上壁１１の上側に圧力がかかっても、この立上壁１１の上側の変形を抑制できる。 In the case of the partition frame 1A, as shown in FIG. 6, the crushed stone 4 laid on the peripheral side of the partition frame 1A presses the outer protruding portion 12 downward, so that the crushed stone 4 is compacted. It is possible to prevent the partition frame 1A from being lifted by the vibration. Further, even if the partition frame 1A is made of a easily deformable resin, the outer protruding portion 12 prevents the lower side wall portion 11a of the rising wall 11 from being deformed, so that the crushed stone 4 prevents the rising wall from being deformed. Even if pressure is applied to the upper side of 11, the deformation of the upper side of the rising wall 11 can be suppressed.

また、上記仕切り枠１Ａであれば、上記釘状物１５を上記貫通孔部１２ａから地面（根伐り底）に打ち込むことによって、上記仕切り枠１Ａを地面に固定することができる。これにより、上記仕切り枠１Ａをさらに浮き上がり難くできる。なお、上記外側突出部１２を有する仕切り枠１Ａは、砕石４が締め固められるときの土中への沈み込みが生じないため、その立上壁１１の高さを、例えば、７０ｍｍよりも低い５０ｍｍ程度とすることができる。 Further, in the case of the partition frame 1A, the partition frame 1A can be fixed to the ground by driving the nail-shaped object 15 into the ground (root cutting bottom) from the through hole portion 12a. As a result, the partition frame 1A can be made more difficult to lift. Since the partition frame 1A having the outer protrusion 12 does not sink into the soil when the crushed stone 4 is compacted, the height of the rising wall 11 is set to 50 mm, which is lower than 70 mm, for example. Can be a degree.

また、図７に示す仕切り枠１Ｂを用いることもできる。この仕切り枠１Ｂは、上記仕切り枠１Ａにおいて、上記立上壁１１と上記外側突出部１２とに接続されるリブ部１３が付加された構造を有する。上記リブ部１３は、直角辺部を有しており、この直角辺部が上記立上壁１１と上記外側突出部１２とに固着されている。もちろん、上記リブ部１３が上記仕切り枠１Ａに一体成形されてもよい。上記リブ部１３が設けられたことによって、上記立上壁１１のさらなる変形抑制効果が得られる。また、この例では、上記リブ部１３の高さは、上記下側壁部１１ａの高さ未満とされているので、複数の仕切り枠１Ｂを積み上げるときに、上側の仕切り枠１Ｂの下側壁部１１ａを下側の仕切り枠１Ｂの上側壁部１１ｂに重ね合わせて、積み上げの嵩を低くすることができる。 Further, the partition frame 1B shown in FIG. 7 can also be used. The partition frame 1B has a structure in which a rib portion 13 connected to the rising wall 11 and the outer protruding portion 12 is added to the partition frame 1A. The rib portion 13 has a right-angled side portion, and the right-angled side portion is fixed to the rising wall 11 and the outer protruding portion 12. Of course, the rib portion 13 may be integrally molded with the partition frame 1A. By providing the rib portion 13, a further deformation suppressing effect of the rising wall 11 can be obtained. Further, in this example, since the height of the rib portion 13 is less than the height of the lower side wall portion 11a, when a plurality of partition frames 1B are stacked, the lower side wall portion 11a of the upper partition frame 1B is stacked. Can be superposed on the upper side wall portion 11b of the lower partition frame 1B to reduce the stacking bulk.

また、図８に示す仕切り枠１Ｃを用いることもできる。この仕切り枠１Ｃは、上記仕切り枠１の構造において、当該仕切り枠を地面に固定する固定部材としての釘状物１４が付加された構造である。上記釘状物１４は、上記下側壁部１１ａの外周部で外側に凸状に形成された固定部材装着部としての樹脂凸部１６内にその上部が埋め込まれており、上記仕切り枠１Ｃを上から押さえる或いは叩くことで、上記釘状物１４を土中に差し込むことができる。なお、上記釘状物１４の先端側に反し部を形成しておくと、浮き上がりに対する抵抗を大きくすることができる。また、上記釘状物１４を上記樹脂凸部１６に着脱可能に設けてもよいものである。また、上記釘状物１４が上記樹脂凸部１６と一体化されたものを、上記仕切り枠１Ｃを地面に固定する固定部とすることができる。 Further, the partition frame 1C shown in FIG. 8 can also be used. The partition frame 1C is a structure in which a nail-shaped object 14 as a fixing member for fixing the partition frame to the ground is added to the structure of the partition frame 1. The upper portion of the nail-shaped object 14 is embedded in a resin convex portion 16 as a fixing member mounting portion formed in a convex shape on the outer peripheral portion of the lower side wall portion 11a, and the partition frame 1C is above the partition frame 1C. The nail-shaped object 14 can be inserted into the soil by pressing or tapping it. If a curved portion is formed on the tip end side of the nail-shaped object 14, the resistance to lifting can be increased. Further, the nail-shaped object 14 may be detachably provided on the resin convex portion 16. Further, the nail-shaped object 14 integrated with the resin convex portion 16 can be used as a fixing portion for fixing the partition frame 1C to the ground.

また、図示はしていないが、上記のリング状のような連続状の外側突出部１２ではなく、分散状に複数の外側突出部を設けて、この分散状の外側突出部に係合させた上記釘状物１５を地盤に打ち込む構成としてもよい。この構成は、仕切り枠の変形を抑制することはあまりできないが、浮き上がり抑制の効果は得られる。 Further, although not shown, a plurality of outward protrusions are provided in a dispersed manner instead of the continuous outer protrusion 12 as in the ring shape, and are engaged with the dispersed outer protrusions. The nail-shaped object 15 may be driven into the ground. With this configuration, it is not possible to suppress the deformation of the partition frame so much, but the effect of suppressing the floating can be obtained.

また、上記仕切り枠１等は円形枠状を有するが、このような形状に限らず、四角枠状に形成されていてもよい。また、上記立上壁１１は円筒状や角筒状に形成されることに限らない。上記立上壁１１が錐台状の筒形状に形成されていてもよく、このような形状でも、上記立上壁の外面上に砕石４が載り、当該立上壁を下側に押さえ付けることができ、また、複数の仕切り枠１等を積み上げるときに、積み上げの嵩を低くすることができる。 Further, although the partition frame 1 and the like have a circular frame shape, the partition frame 1 and the like are not limited to such a shape and may be formed in a square frame shape. Further, the rising wall 11 is not limited to being formed in a cylindrical shape or a square tubular shape. The rising wall 11 may be formed in a frustum-shaped tubular shape, and even in such a shape, the crushed stone 4 is placed on the outer surface of the rising wall and presses the rising wall downward. In addition, when stacking a plurality of partition frames 1 and the like, the volume of stacking can be reduced.

以上、図面を参照してこの発明の実施形態を説明したが、この発明は、図示した実施形態のものに限定されない。図示した実施形態に対して、この発明と同一の範囲内において、あるいは均等の範囲内において、種々の修正や変形を加えることが可能である。 Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to those of the illustrated embodiments. It is possible to make various modifications and modifications to the illustrated embodiment within the same range as the present invention or within the same range.

１ ：仕切り枠
１Ａ ：仕切り枠
１Ｂ ：仕切り枠
１Ｃ ：仕切り枠
２ ：杭状地盤補強体
３ ：溝掘り部
４ ：砕石
５ ：型枠
６ ：建物基礎
１１ ：立上壁
１１ａ ：下側壁部
１１ｂ ：上側壁部
１２ ：外側突出部
１２ａ ：貫通孔部
１３ ：リブ部
１４ ：釘状物（固定部材）
１５ ：釘状物
１６ ：樹脂凸部（固定部材装着部）
２１ ：杭頭
３１ ：杭頭上空間
４１ ：土
６１ ：フーチング部
６２ ：立ち上げ部
６３ ：杭頭上コンクリート部
１００ ：仕切り枠 1: Partition frame 1A: Partition frame 1B: Partition frame 1C: Partition frame 2: Pile-shaped ground reinforcement 3: Grooving part 4: Crushed stone 5: Formwork 6: Building foundation 11: Rising wall 11a: Lower side wall portion 11b : Upper side wall portion 12: Outer protruding portion 12a: Through hole portion 13: Rib portion 14: Nail-shaped object (fixing member)
15: Nail-shaped object 16: Resin convex part (fixing member mounting part)
21: Pile head 31: Pile head space 41: Soil 61: Footings 62: Rising part 63: Pile head concrete part 100: Partition frame

Claims (7)

地盤に打ち込まれた杭状地盤補強体の杭頭を露呈させる工程と、上記杭頭の上側にコンクリート打設用の杭頭上空間を形成する仕切り枠を配置する工程と、上記仕切り枠の周囲側に砕石を敷いて締め固める工程と、上記杭頭上空間を含む領域に建物基礎の型枠を設ける工程と、上記型枠内および上記杭頭上空間内にコンクリートを打設する工程と、を含むことを特徴とする建物基礎の施工方法。 The process of exposing the pile head of the pile-shaped ground reinforcement driven into the ground, the process of arranging a partition frame forming a space above the pile head for concrete placement above the pile head, and the peripheral side of the partition frame. Includes a step of laying crushed stone on the pile and compacting it, a step of providing a mold for the building foundation in the area including the space above the pile head, and a step of placing concrete in the mold and the space above the pile head. Construction method of building foundation characterized by. 請求項１に記載の建物基礎の施工方法において、上記仕切り枠の内周部が上記杭頭の周囲縁から離れていることを特徴とする建物基礎の施工方法。 The method for constructing a building foundation according to claim 1, wherein the inner peripheral portion of the partition frame is separated from the peripheral edge of the pile head. 地盤に打ち込まれた杭状地盤補強体の杭頭の周囲側に敷かれる砕石が杭頭側に入り込むのを止めるとともに上記杭頭上に打設されるコンクリートが上記砕石側に流れるのを止める立上壁を有することを特徴とする仕切り枠。 Rising that stops the crushed stones laid around the pile head of the pile-shaped ground reinforcement driven into the ground from entering the pile head side and stops the concrete placed on the pile head from flowing to the crushed stone side. A partition frame characterized by having a wall. 請求項３に記載の仕切り枠において、上記立上壁の下側縁から外方向に突出する外側突出部を備えることを特徴とする仕切り枠。 The partition frame according to claim 3, further comprising an outer protruding portion that projects outward from the lower edge of the rising wall. 請求項４に記載の仕切り枠において、上記立上壁と上記外側突出部とに接続されるリブ部を備えることを特徴とする仕切り枠。 The partition frame according to claim 4, further comprising a rib portion connected to the rising wall and the outer protruding portion. 請求項３〜請求項５のいずれか１項に記載の仕切り枠において、当該仕切り枠を地面に固定する固定部を有するか、または当該仕切り枠を地面に固定する固定部材が装着される固定部材装着部を有することを特徴とする仕切り枠。 In the partition frame according to any one of claims 3 to 5, a fixing member having a fixing portion for fixing the partition frame to the ground or a fixing member for fixing the partition frame to the ground is mounted. A partition frame characterized by having a mounting portion. 請求項３〜請求項６のいずれか１項に記載の仕切り枠において、上記立上壁の上部側の外形状が当該立上壁の下部側の内形状よりも小さくされており、上記立上壁の上部側が、別の仕切り枠の立上壁の下部側内に嵌ることを特徴とする仕切り枠。 In the partition frame according to any one of claims 3 to 6, the outer shape of the upper side of the rising wall is smaller than the inner shape of the lower side of the rising wall, and the rising wall is formed. A partition frame characterized in that the upper side of the wall fits inside the lower side of the rising wall of another partition frame.
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JP2016056510A (en) * 2014-09-05 2016-04-21 大和ハウス工業株式会社 Foundation structure of building, and construction method for foundation of building
JP2016056511A (en) * 2014-09-05 2016-04-21 大和ハウス工業株式会社 Foundation structure of building, and construction method for foundation of building
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JPS5027308A (en) * 1973-07-16 1975-03-20
JPH11140887A (en) * 1997-11-07 1999-05-25 Katashi Sendai Method for anchoring foundation pile to foundation and pile anchor therefor
JP2000319904A (en) * 1999-03-09 2000-11-21 Sumitomo Metal Ind Ltd Foundation of structure
JP2004308330A (en) * 2003-04-09 2004-11-04 Nippon Steel Corp High floor type steel structure foundation beam structure
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