JP6103572B2 - Construction method of foundation pile - Google Patents

Construction method of foundation pile Download PDF

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JP6103572B2
JP6103572B2 JP2011084977A JP2011084977A JP6103572B2 JP 6103572 B2 JP6103572 B2 JP 6103572B2 JP 2011084977 A JP2011084977 A JP 2011084977A JP 2011084977 A JP2011084977 A JP 2011084977A JP 6103572 B2 JP6103572 B2 JP 6103572B2
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steel pipe
foundation pile
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北村　精男
北村　　精男
博之 安岡
博之 安岡
秀雄 古市
秀雄 古市
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GIKEN LTD.
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本発明は、建物や橋梁等構造物の荷重を支える基礎杭の施工方法に関する。 The present invention relates to a method for constructing a foundation pile that supports the load of a structure such as a building or a bridge.

従来より、建物等の荷重を支持する基礎部材として杭が用いられている。
この場合、杭に作用する荷重に対しては、杭の外周面に沿って作用する周面摩擦力、及び杭の底部が受ける地盤反力で抵抗することになるが、荷重が大きい場合には杭径・杭長や本数を大きくする必要があり、不経済であった。 Conventionally, a pile has been used as a foundation member for supporting a load of a building or the like.
In this case, the load acting on the pile is resisted by the peripheral frictional force acting along the outer peripheral surface of the pile and the ground reaction force received by the bottom of the pile, but when the load is large It was uneconomical because it was necessary to increase the pile diameter, pile length and number.

これに対し、特許文献１において、杭の鉛直方向中間部や底部に、他の部位に比べて径が大きい節部や拡径部を設けた節付杭が提案されている。
このような節付杭によれば、建物の荷重により下方に向かって押し込み荷重が作用した場合には、杭の外周面に沿って作用する周面摩擦力、及び杭の底部が受ける地盤反力に加えて、節部の下部に周囲の地盤より支圧力が作用するため、より大きな押込荷重に対して抵抗することができる。
また、建物に転倒モーメントが作用し、上方に向かう引抜荷重が作用した場合には、杭の外周面に沿って作用する周面摩擦力に加えて、節部及び拡径部の上部に地盤より支圧力が作用するため、より大きな引抜荷重に対して抵抗することができる。 On the other hand, Patent Document 1 proposes a knotted pile provided with a node portion and a diameter-enlarged portion having a diameter larger than that of other portions at the vertical intermediate portion and the bottom portion of the pile.
According to such a knotted pile, when a downward load is applied due to the load of the building, the circumferential frictional force acting along the outer circumferential surface of the pile and the ground reaction force received by the bottom of the pile In addition, since a supporting pressure acts on the lower part of the node portion from the surrounding ground, it is possible to resist a larger indentation load.
In addition, when a falling moment acts on the building and an upward pulling load acts on the building, in addition to the peripheral frictional force acting along the outer peripheral surface of the pile, the ground and the upper part of the node part and the enlarged diameter part Since the support pressure acts, it is possible to resist a larger pulling load.

特開２００９−１１４６９６号公報JP 2009-114696 A

しかし、土中において、杭の中間部や先端部に、特許文献１のような拡径部を設けるためには、拡径機能を備えたバケットを用いて、高濃度の泥水等で孔壁を保持しながら節付杭の形状に合わせた掘削孔を形成する。次に、その掘削孔に鉄筋かごを挿入する。そして、コンクリートを下方より上方に向かって泥水と置き換えながら打設する。
従って、泥水のためのプラントやコンクリートプラントなどの設備の設置、削孔のための大型機械の配置など施工面積が大きくなるばかりか施工に手間と時間を要す。 However, in the soil, in order to provide an enlarged portion as in Patent Document 1 at the middle or tip of the pile, using a bucket having an enlarged diameter function, the hole wall is made of high-concentration mud water or the like. While holding, form a drilling hole that matches the shape of the knotted pile. Next, a rebar cage is inserted into the excavation hole. Then, the concrete is placed while replacing muddy water from below to above.
Therefore, the construction area such as the installation of facilities such as a muddy water plant and a concrete plant and the placement of a large machine for drilling are not only large, but also the construction takes time and effort.

本発明の課題は、軟弱地盤であっても鉛直支持力、水平反力を増大でき、杭本数、杭径、杭長を減らし、省面積で、短い工期、低コストで構築可能な基礎杭の施工方法を提供することである。 The problem of the present invention is that it is possible to increase the vertical bearing force and horizontal reaction force even in soft ground, reduce the number of piles, pile diameter, pile length, save area, short construction period, and low cost foundation piles . It is to provide a construction method .

以上の課題を解決するため、請求項１に記載の発明は、断面円形で外径一様であり頭部を残して地中に埋設される鋼管と、前記鋼管を挿通する開口を上部に有し、下向きに開く笠状で、地表近傍に貫入される鋼製の笠状部材と、からなる基礎杭を施工する方法であって、
前記鋼管を回転圧入により地盤に打設する工程を実行し、その後、
前記笠状部材の開口に前記鋼管を挿通させて、前記笠状部材を地表近傍に貫入し、当該貫入に伴って当該笠状部材に内包された土砂を圧密し、下部の地盤を補強する工程と、
前記鋼管と笠状部材とを一体化させる工程とを実行して構築することを特徴とする。 In order to solve the above-mentioned problems, the invention described in claim 1 has a steel pipe embedded in the ground with a circular cross section and a uniform outer diameter , leaving a head , and an opening through which the steel pipe is inserted at the upper part. And a method of constructing a foundation pile composed of a steel shade-shaped member penetrating into the vicinity of the ground surface with a shade-shaped shape that opens downward ,
Execute the process of placing the steel pipe into the ground by rotary press-fitting ,
Inserting the steel pipe through the opening of the cap-shaped member, penetrating the cap-shaped member near the ground surface , consolidating the earth and sand contained in the cap-shaped member with the penetration, and reinforcing the lower ground When,
It is constructed by executing the step of integrating the steel pipe and the cap member.

本発明によれば、軟弱な地盤であっても大きな支持力が得られ、省面積で、施工が簡便な基礎杭を構築できるので、例えば災害復旧時に必要となる仮設桟橋等が容易に構築できる。   According to the present invention, a large support force can be obtained even on soft ground, and a foundation pile that is easy to construct can be constructed with a small area. For example, a temporary pier required for disaster recovery can be easily constructed. .

本発明を適用した基礎杭の一実施形態の構成を示すもので、筒状体を計画位置に設置した図（ａ）、筒状体に笠状部材を設置した図（ｂ）、笠状部材を貫入した図（ｃ）、筒状体に笠状部材を一体化した基礎杭の完成状態の図（ｄ）である。The figure which shows the structure of one Embodiment of the foundation pile to which this invention is applied, the figure which installed the cylindrical body in the plan position (a), the figure which installed the cap member in the cylindrical body, the cap member It is a figure (d) of the completion state of the foundation pile which integrated figure (c) which penetrated No. 1, and a shaded member in a cylindrical body. 本発明の基礎杭による鉛直力Ｐに対する作用を説明する図（ａ）と、同じく水平力Ｈに対する作用を説明する図（ｂ）である。It is the figure (a) explaining the effect | action with respect to the vertical force P by the foundation pile of this invention, and the figure (b) explaining the effect | action with respect to the horizontal force H similarly. 本発明の基礎杭を仮設桟橋に適用した例を示す平面図である。It is a top view which shows the example which applied the foundation pile of this invention to the temporary pier. 図３の側面図である。FIG. 4 is a side view of FIG. 3.

以下、図を参照して本発明を実施するための形態を詳細に説明する。
（実施形態）
図１は本発明を適用した基礎杭の一実施形態の構成を示すもので、１は筒状体、２は笠状部材、３は基礎杭である。 DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
(Embodiment)
FIG. 1 shows a configuration of an embodiment of a foundation pile to which the present invention is applied. 1 is a cylindrical body, 2 is a cap member, and 3 is a foundation pile.

すなわち、図１（ａ）は筒状体１を計画位置に設置した状態を示している。
図示のように、筒状体１を、その頭部を残して地中に埋設させて打設する。 That is, Fig.1 (a) has shown the state which installed the cylindrical body 1 in the plan position.
As shown in the figure, the cylindrical body 1 is placed by being buried in the ground leaving its head.

筒状体１は、コンクリート管または鋼管であり、その断面は、回転圧入できるようにするため、円形が好ましい。   The cylindrical body 1 is a concrete pipe or a steel pipe, and its cross section is preferably circular so that it can be rotationally press-fitted.

図１（ｂ）は筒状体１に笠状部材２を設置した状態を示している。
図示のように、笠状部材２の開口に筒状体１の頭部を挿通させて、筒状体１に沿わせて笠状部材２を、その略上半部を残して地表近傍に打設する。 FIG. 1B shows a state in which the shade member 2 is installed on the cylindrical body 1.
As shown in the figure, the head of the cylindrical body 1 is inserted through the opening of the cap-shaped member 2, and the cap-shaped member 2 is driven along the cylindrical body 1 in the vicinity of the ground surface, leaving the upper half of the cap. Set up.

笠状部材２は、コンクリート製または鋼製であり、その中心部に図示しない開口を有し、筒状体１の外周面に略平行な外壁面２１と、その外壁面２１の上部から開口に向かう斜壁面２２と、その斜壁面２２の上部から開口に沿って上方に突出され、筒状体１の外径より僅かに大きい内径を有するカラー部２３と、を備える形状となっている。   The cap-shaped member 2 is made of concrete or steel, has an opening (not shown) at the center thereof, an outer wall surface 21 substantially parallel to the outer peripheral surface of the tubular body 1, and an opening from the top of the outer wall surface 21. It has a shape including an inclined wall surface 22 that faces and a collar portion 23 that protrudes upward from the upper portion of the inclined wall surface 22 along the opening and has an inner diameter slightly larger than the outer diameter of the cylindrical body 1.

図１（ｃ）は笠状部材２を貫入した状態を示している。
図示のように、筒状体１に沿わせて笠状部材２を、その頭部のカラー部２３のみを残して地表に貫入させる。 FIG. 1C shows a state in which the shade member 2 is penetrated.
As shown in the figure, the shade member 2 is made to penetrate the ground surface along the cylindrical body 1 leaving only the collar portion 23 of the head portion.

図１（ｄ）は筒状体１に笠状部材２を一体化した基礎杭３の完成状態を示している。
図示のように、筒状体１に対し笠状部材２のカラー部２３の上縁を接合させて一体化する。 FIG. 1 (d) shows a completed state of the foundation pile 3 in which the shade member 2 is integrated with the tubular body 1.
As shown in the figure, the upper edge of the collar portion 23 of the cap member 2 is joined to the cylindrical body 1 to be integrated.

なお、笠状部材２の頭部のカラー部２３に予め係止手段を配しておくとよい。その係止手段としては、例えば楔、ボルト接合、溶接等で接合に好適なものである。 In addition, it is good to arrange | position a latching means beforehand to the collar part 23 of the head of the cap-shaped member 2. As the locking means, for example, a wedge, bolt joining, welding, or the like is suitable for joining.

図２（ａ）は基礎杭３による鉛直力Ｐに対する作用を説明するもので、鉛直力Ｐに対して、大口径の笠状部材２によって表層部でも大きな支持力が得られる。
すなわち、鉛直力Ｐに対しては、図示のように、基礎杭３の筒状体１の下端による杭先端反力と周面の摩擦力に加えて、笠状部材２の下面による地盤反力と外壁面２２の摩擦力が得られる。 FIG. 2A illustrates the action of the foundation pile 3 on the vertical force P. With respect to the vertical force P, a large supporting force can be obtained even in the surface layer portion by the large-diameter shade member 2.
That is, for the vertical force P, the ground reaction force due to the lower surface of the cap-shaped member 2 in addition to the pile tip reaction force due to the lower end of the tubular body 1 of the foundation pile 3 and the frictional force on the circumferential surface, as shown in the figure. And the frictional force of the outer wall surface 22 is obtained.

図２（ｂ）は基礎杭３による水平力Ｈに対する作用を説明するもので、水平力Ｈに対して、杭の特性値である１／βの範囲に大口径の笠状部材２を置くことで、大きな水平反力が得られる。
そして、笠状部材２がモーメントＭに対抗するため、笠状部材２が支点効果をもたらし、笠状部材２に対して地盤回転バネＫＲが作用する。
すなわち、水平力Ｈに対しては、図示のように、基礎杭３の筒状体１の下端による杭先端抵抗力ＫＶ１と周面の抵抗力ＫＨ２に加えて、笠状部材２の下面による地盤抵抗力ＫＶ２と外壁面２２の抵抗力ＫＨ１が得られる。 FIG. 2 (b) illustrates the action of the foundation pile 3 on the horizontal force H, and the large-diameter shade member 2 is placed in the range of 1 / β which is the characteristic value of the pile against the horizontal force H. Thus, a large horizontal reaction force can be obtained.
And since the cap-shaped member 2 opposes the moment M, the cap-shaped member 2 brings about a fulcrum effect, and the ground rotation spring KR acts on the cap-shaped member 2.
That is, for the horizontal force H, as shown in the figure, in addition to the pile tip resistance force KV1 and the peripheral surface resistance force KH2 by the lower end of the tubular body 1 of the foundation pile 3, the ground by the lower surface of the cap member 2 A resistance force KV2 and a resistance force KH1 of the outer wall surface 22 are obtained.

以上、実施形態の基礎杭３によれば、筒状体１の先端支持力、周面摩擦力に加え、笠状部材２の底面の支持力が杭に作用する鉛直荷重に対抗するため、杭径・杭長・本数を低減できる。
しかも、構造が簡便であるため、容易に撤去ができる。
そして、笠状部材２の打設に伴って、笠状部材２に内包された土砂が圧密され、下部の地盤が補強される。
また、地表近傍に配した笠状部材２の壁面の支圧面積が筒状体１より大径であるため、筒状体１に作用する水平力Ｈに対して、杭径・杭長・本数を低減できる。
さらに、施工が簡便であるため、省面積でよく、工期が短くて済み、よって経済的である。 As described above, according to the foundation pile 3 of the embodiment, since the support force on the bottom surface of the cap-shaped member 2 counters the vertical load acting on the pile in addition to the tip support force and the circumferential friction force of the cylindrical body 1, the pile Diameter, pile length and number can be reduced.
Moreover, since the structure is simple, it can be removed easily.
And with the placement of the cap member 2, the earth and sand contained in the cap member 2 is consolidated, and the lower ground is reinforced.
Moreover, since the bearing area of the wall surface of the cap-shaped member 2 arranged in the vicinity of the ground surface is larger than that of the cylindrical body 1, the pile diameter, the pile length, and the number of the horizontal force H acting on the cylindrical body 1 Can be reduced.
Further, since the construction is simple, the area can be saved, and the construction period is short, which is economical.

図３及び図４は基礎杭３を仮設桟橋に適用した例を示すもので、４は橋梁上部工、５は梁である。また、３と５との組合せは橋梁下部工である。 3 and 4 show examples of applying the foundation pile 3 to the temporary設桟Bridge 4 bridges superstructure, 5 is beam. The combination of 3 and 5 is a bridge substructure.

すなわち、筒状体１に笠状部材２を一体化した基礎杭３で、梁５を支持しており、図４に示すように、筒状体１の頭部を延長して梁５を支持している。 That is, the beam 5 is supported by the foundation pile 3 in which the shade member 2 is integrated with the cylindrical body 1, and the head of the cylindrical body 1 is extended to support the beam 5 as shown in FIG. doing.

このように、筒状体１の頭部を延長して梁５を支持することで、容易に橋梁下部工を構築できる。 In this way, by supporting the beam 5 by extending the head of the tubular body 1, it can easily build bridges bottom Engineering.

（変形例）
以上の実施形態において、筒状体の断面形状、笠状部材の形状等も任意であり、その他、具体的な細部構造等についても適宜に変更可能であることは勿論である。 (Modification)
In the above embodiment, the cross-sectional shape of the cylindrical body, the shape of the cap-shaped member, and the like are arbitrary, and it is needless to say that specific detailed structures and the like can be appropriately changed.

１ 筒状体
２ 笠状部材
２１ 外壁面
２２ 斜壁面
２３ カラー部
３ 基礎杭
４ 仮設桟橋
５ 橋梁下部工 DESCRIPTION OF SYMBOLS 1 Tubular body 2 Shade-shaped member 21 Outer wall surface 22 Diagonal wall surface 23 Collar part 3 Foundation pile 4 Temporary pier 5 Bridge substructure

Claims (1)

断面円形で外径一様であり頭部を残して地中に埋設される鋼管と、前記鋼管を挿通する開口を上部に有し、下向きに開く笠状で、地表近傍に貫入される鋼製の笠状部材と、からなる基礎杭を施工する方法であって、
前記鋼管を回転圧入により地盤に打設する工程を実行し、その後、
前記笠状部材の開口に前記鋼管を挿通させて、前記笠状部材を地表近傍に貫入し、当該貫入に伴って当該笠状部材に内包された土砂を圧密し、下部の地盤を補強する工程と、
前記鋼管と笠状部材とを一体化させる工程とを実行して構築することを特徴とする基礎杭の施工方法。 A steel pipe that is circular in cross section and has a uniform outer diameter and that is embedded in the ground leaving the head, and a steel pipe that has an opening through which the steel pipe is inserted at the top and that opens downward and penetrates near the ground surface . A method of constructing a foundation pile made of
Execute the process of placing the steel pipe into the ground by rotary press-fitting ,
Inserting the steel pipe through the opening of the cap-shaped member, penetrating the cap-shaped member near the ground surface , consolidating the earth and sand contained in the cap-shaped member with the penetration, and reinforcing the lower ground When,
A construction method for a foundation pile, wherein the construction is performed by executing a step of integrating the steel pipe and the cap member.
JP2011084977A 2011-04-07 2011-04-07 Construction method of foundation pile Active JP6103572B2 (en)

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