JP3899094B2 - Foundation reinforcement method for existing structures by press-fitting steel pipe piles - Google Patents

Foundation reinforcement method for existing structures by press-fitting steel pipe piles Download PDF

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JP3899094B2
JP3899094B2 JP2004249468A JP2004249468A JP3899094B2 JP 3899094 B2 JP3899094 B2 JP 3899094B2 JP 2004249468 A JP2004249468 A JP 2004249468A JP 2004249468 A JP2004249468 A JP 2004249468A JP 3899094 B2 JP3899094 B2 JP 3899094B2
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努 並河
雅路 青木
富男 土屋
芳雄 平井
康則 椿原
崇史 柴田
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Takenaka Corp
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この発明は、既存構造物の改修に際しての荷重増加対策、或いは地盤の液状化対策として実施する基礎補強工法、特に既存構造物の内部から新たに鋼管杭を地盤中へ圧入することによる既存構造物の基礎補強工法の技術分野に属する。   The present invention relates to a foundation reinforcement construction method implemented as a countermeasure for increasing the load when renovating an existing structure or a countermeasure for liquefaction of the ground, in particular, an existing structure by newly pressing a steel pipe pile into the ground from the inside of the existing structure. Belongs to the technical field of foundation reinforcement method.

既存構造物の改修に際し、規模の拡大に伴う荷重の増加対策、或いは地盤の液状化対策として、特に既存構造物の内部から新たに鋼管杭を地盤中へ圧入することによる基礎補強工法が、実施化に向けて種々研究・開発されている。
例えば下記の特許文献１には、既設の基礎梁のベース部を挟むアンカー部材を設置し、このアンカー部材に下端を固定して垂直に立ち上がらせた倒立Ｕ字形状の支持枠の中間部に反力桁を取り付け、この反力桁にジャッキを設置し、地盤上に立てた杭体を前記ジャッキにより圧入する装置及び基礎補強工法が開示されている。但し、この工法は、基礎梁の横断面が倒立Ｔ字形状をなし、ベース部を有することを前提としており、前記条件を満たさないと実施は不可能である。また、ベース部を挟むアンカー部材を設置するためには、ベース部を掘り出す必要がある。その際に、もし仮に基礎スラブが存在すれば（通例は存在する）、これを作業上必要とされる範囲までを解体しなければならない。 When renovating an existing structure, a foundation reinforcement method was implemented, in particular by pressing a steel pipe pile into the ground from the inside of the existing structure, as a measure to increase the load accompanying an increase in scale or to liquefy the ground. Various researches and developments are underway to make it easier.
For example, in Patent Document 1 below, an anchor member that sandwiches the base portion of an existing foundation beam is installed, and the lower end of the anchor member is fixed to the anchor member so as to stand upright. A device and a foundation reinforcing method for attaching a force girder, installing a jack on the reaction force girder, and press-fitting a pile body standing on the ground with the jack are disclosed. However, this method is based on the premise that the cross section of the foundation beam has an inverted T-shape and has a base portion, and cannot be implemented unless the above conditions are satisfied. Moreover, in order to install the anchor member that sandwiches the base portion, it is necessary to dig out the base portion. At that time, if a basic slab exists (usually exists), it must be dismantled to the extent required for work.

また、下記の特許文献２には、地盤沈下等により既存構造物の基礎が不等沈下した場合に、基礎梁の側面部に反力治具を取り付け、この反力治具に支持されたジャッキで地盤中に杭を圧入して構造物基礎の水平度を修正する工法が開示されている。
更に特許文献３には、高さ制限のある既存構造物等の内部から地盤中へ鋼管杭を圧入する場合に、作業に適切な単位長さの鋼製杭部材を順次継ぎ足して地盤中へ圧入する装置及び工法が開示されている。 Further, in Patent Document 2 below, when the foundation of an existing structure is unevenly subsidized due to ground subsidence or the like, a reaction force jig is attached to the side surface portion of the foundation beam, and a jack supported by the reaction force jig. A method for correcting the level of the foundation of a structure by pressing a pile into the ground is disclosed.
Furthermore, in Patent Document 3, when steel pipe piles are press-fitted into the ground from the inside of existing structures with height restrictions, etc., steel pile members of appropriate unit length are sequentially added and pressed into the ground. An apparatus and a method for performing the same are disclosed.

特開平９−７８５８０号公報JP-A-9-78580 特許第３０２９７９７号公報Japanese Patent No. 3029797 特開２００２−３８４７８号公報JP 2002-38478 A

上記した特許文献１〜３に開示された基礎補強装置及び工法はそれぞれ固有の特徴を有するが、特有のアンカー部材や反力治具或いは溶接圧入装置を使用することが前提条件であるから、必然、それらを使用可能な条件が整えられることが必須不可欠であり、普遍的に実施可能な技術と云うには問題がある。   Although the above-described foundation reinforcing devices and methods disclosed in Patent Documents 1 to 3 have their own characteristics, it is necessary to use a unique anchor member, reaction force jig, or welding press-fit device. It is indispensable that the conditions under which they can be used are prepared, and there is a problem with the technology that can be universally implemented.

本発明の目的は、従来技術の上述した問題点を解決すること、具体的には既存構造物に基礎梁が存在し、又は残存しておれば、普遍的に確実に容易に実施することが可能であり、鋼管杭を地盤中へ圧入して基礎及び地盤の補強を行うことが出来、ひいては既存構造物の改修に際しての荷重増加対策や地盤の液状化対策としての実効をあらしめる基礎補強工法を提供することである。   The object of the present invention is to solve the above-mentioned problems of the prior art, specifically, to easily and universally and easily implement if a foundation beam is present or remains in an existing structure. It is possible to reinforce the foundation and ground by pressing steel pipe piles into the ground, and as a result, the foundation reinforcement construction method that is effective as a countermeasure against load increase when renovating existing structures and as a countermeasure against liquefaction of the ground Is to provide.

上述した従来技術の課題を解決するための手段として、請求項１に記載した発明に係る鋼管杭圧入による既存構造物の基礎補強工法は、
既存構造物の基礎スラブ１上に、アンカー鉄筋２等の繋ぎ材を介して基礎梁３と構造的に一体化した鉄筋コンクリート造の新設フーチング４を構築すると共に、同新設フーチング４に鋼管杭５の圧入用孔６を形成し、且つアンカー材７により新設フーチング４に支持されてほぼ垂直に立ち上がる複数本のＰＣ鋼材８を設置する段階と、
前記新設フーチング４のコンクリートが所定の強度を発現した後に、前記圧入用孔６の直下の基礎スラブ１を掘削して開口１１を設け、前記圧入用孔６及び開口１１を通じて鋼管杭５を挿入して地盤上に立てる。また、前記ＰＣ鋼材８の上部に反力盤１２を取り付け、同反力盤１２の下側に鋼管杭圧入用のジャッキ１３を設置し、前記鋼管杭５を前記ジャッキ１３により地盤中へ圧入する段階と、
鋼管杭５を地盤中へ所定の深度まで圧入した打ち止め確認後に、同鋼管杭５の杭頭部外周にスタッド１５等の応力伝達要素を取り付け、補強鉄筋１６を配筋し、鋼管杭５の杭頭部と新設フーチング４との間にコンクリート１７等の固結材を充填して鋼管杭５と新設フーチング４を構造的に一体化する段階と、から成ることを特徴とする。 As a means for solving the above-described problems of the prior art, the foundation reinforcement method for an existing structure by steel pipe pile press-fitting according to the invention described in claim 1 is:
On the foundation slab 1 of the existing structure, a new reinforced concrete structure footing 4 that is structurally integrated with the foundation beam 3 via a connecting member such as an anchor reinforcement 2 is constructed, and a steel pipe pile 5 is installed on the new footing 4. A step of forming a plurality of PC steel materials 8 that form press-fitting holes 6 and are supported by the new footing 4 by the anchor material 7 and rise substantially vertically;
After the concrete of the new footing 4 exhibits a predetermined strength, the foundation slab 1 immediately below the press-fitting hole 6 is excavated to provide an opening 11, and the steel pipe pile 5 is inserted through the press-fitting hole 6 and the opening 11. Stand on the ground. Further, a reaction force plate 12 is attached to the upper portion of the PC steel material 8, a jack 13 for press-fitting a steel pipe pile is installed below the reaction force plate 12, and the steel pipe pile 5 is press-fitted into the ground by the jack 13. Stages,
After confirming that the steel pipe pile 5 has been press-fitted into the ground to a predetermined depth, a stress transmission element such as a stud 15 is attached to the outer periphery of the pile head of the steel pipe pile 5, reinforcing reinforcing bars 16 are arranged, and the pile of the steel pipe pile 5 The steel pipe pile 5 and the new footing 4 are structurally integrated by filling a solidified material such as concrete 17 between the head and the new footing 4.

請求項２に記載した発明は、請求項１に記載した鋼管杭圧入による既存構造物の基礎補強工法において、
新設フーチング４と接する基礎梁３の表面に応力伝達性能を高める凹凸形状を形成する表面処理を行い、また、基礎スラブ１にスタッド９等の応力伝達要素を取り付けて、基礎梁３及び基礎スラブ１と構造的に一体化した新設フーチング４を構築することを特徴とする。 The invention described in claim 2 is a method for reinforcing a foundation of an existing structure by press-fitting a steel pipe pile according to claim 1,
Surface treatment is performed to form a concavo-convex shape that enhances the stress transmission performance on the surface of the foundation beam 3 in contact with the newly installed footing 4, and stress transmission elements such as studs 9 are attached to the foundation slab 1, and the foundation beam 3 and foundation slab 1 And a new footing 4 that is structurally integrated.

請求項３に記載した発明は、請求項１に記載した鋼管杭圧入による既存構造物の基礎補強工法において、
新設フーチング４に形成する鋼管杭５の圧入用孔６の孔壁部に、鋼管杭５との間に充填するコンクリート１７等の固結材との構造的な一体化性能を高める凹凸形状１８を設けることを特徴とする。 The invention described in claim 3 is a method for reinforcing a foundation of an existing structure by press-fitting a steel pipe pile according to claim 1,
In the hole wall portion of the press-fitting hole 6 of the steel pipe pile 5 formed in the new footing 4, an uneven shape 18 that enhances the structural integration performance with a solidified material such as concrete 17 filled between the steel pipe pile 5 is provided. It is characterized by providing.

本発明に係る鋼管杭圧入による既存構造物の基礎補強工法は、既存構造物の基礎梁３が存在し、反力要素として利用できるかぎり、この基礎梁３と構造的に一体化した新設フーチング４を構築し、更に反力体としてのＰＣ鋼材８を設置することにより、既存構造物の内側からでも可及的速やかに効率よく鋼管杭５を地盤中へ圧入して基礎及び地盤の補強を行うことが出来る。その結果、既存構造物の改修に際して、規模の拡大等に伴う荷重増加の対策、或いは地盤の液状化対策に実効をあらしめる。
かくして鋼管杭５による基礎の補強が達成される結果、既存構造物の床面積を拡大する造床が可能となる。 As long as the existing structural foundation beam 3 exists and can be used as a reaction force element, the foundation reinforcement method for the existing structure by press-fitting steel pipe piles according to the present invention is a new footing 4 that is structurally integrated with the foundation beam 3. In addition, by installing PC steel 8 as a reaction force body, the steel pipe pile 5 is pressed into the ground as efficiently as possible even from the inside of the existing structure to reinforce the foundation and ground. I can do it. As a result, when the existing structure is renovated, it will be effective for measures to increase the load accompanying the expansion of scale, etc., or measures for liquefaction of the ground.
Thus, as a result of the reinforcement of the foundation by the steel pipe pile 5, the flooring that expands the floor area of the existing structure becomes possible.

既存構造物の基礎スラブ１上に、アンカー鉄筋２等の繋ぎ材（剪断力伝達要素）を介して基礎梁３と構造的に一体化した鉄筋コンクリート造の新設フーチング４を構築する。同新設フーチング４には鋼管杭５の圧入用孔６を形成し、且つアンカー材（アンカープレート７）により新設フーチング４に支持されてほぼ垂直に立ち上がる複数本のＰＣ鋼材８を設置する。
前記新設フーチング４のコンクリートが所定の強度を発現した後に、前記圧入用孔６の直下の基礎スラブ１を掘削して開口１１を設け、前記圧入用孔６及び開口１１を通じて鋼管杭５を挿入して地盤上に立てる。また、前記ＰＣ鋼材８の上部に反力盤１２を取り付け、同反力盤１２の下側に鋼管圧入用のジャッキ１３を設置し、前記鋼管杭５をジャッキ１３により地盤中へ圧入する。
鋼管杭５を地盤中へ所定の深度まで圧入した打ち止め確認後に、同鋼管杭５の杭頭部外周にスタッド１５等の応力伝達要素を取り付け、補強鉄筋１６を配筋し、鋼管杭５の杭頭部と新設フーチング４との間にコンクリート１７等の固結材を充填して鋼管杭５と新設フーチング４を構造的に一体化する。 On the foundation slab 1 of the existing structure, a new reinforced concrete footing 4 that is structurally integrated with the foundation beam 3 via a connecting material (shearing force transmission element) such as an anchor reinforcement 2 is constructed. In the new footing 4, a press-fitting hole 6 for the steel pipe pile 5 is formed, and a plurality of PC steel materials 8 which are supported by the new footing 4 by an anchor material (anchor plate 7) and rise almost vertically are installed.
After the concrete of the new footing 4 exhibits a predetermined strength, the foundation slab 1 immediately below the press-fitting hole 6 is excavated to provide an opening 11, and the steel pipe pile 5 is inserted through the press-fitting hole 6 and the opening 11. Stand on the ground. Further, a reaction force plate 12 is attached to the upper part of the PC steel material 8, a jack 13 for steel pipe press-fitting is installed below the reaction force plate 12, and the steel pipe pile 5 is press-fitted into the ground by the jack 13.
After confirming that the steel pipe pile 5 has been press-fitted into the ground to a predetermined depth, a stress transmission element such as a stud 15 is attached to the outer periphery of the pile head of the steel pipe pile 5, reinforcing reinforcing bars 16 are arranged, and the pile of the steel pipe pile 5 A solidified material such as concrete 17 is filled between the head and the new footing 4 to structurally integrate the steel pipe pile 5 and the new footing 4.

本発明の実施例を示す図１と図２の場合は、既存構造物の基礎スラブ１上に、剪断力を伝達する繋ぎ材である複数本のアンカー鉄筋２…を介して基礎梁３と構造的に一体化した鉄筋コンクリート造の新設フーチング４を構築すると共に、同新設フーチング４には鋼管杭５の圧入用孔６を形成し、且つアンカー材として採用した複数のアンカープレート７を新設フーチング４中に埋設して支持されほぼ垂直に立ち上がる複数本のＰＣ鋼材８、８を設置している。アンカー鉄筋２は、基礎梁３に穴を掘り、一端部を基礎梁３の中へ十分深く埋め込むと共に、新設フーチング４との構造的な一体化に必要な本数を設置する。前記圧入用孔６の口径は、鋼管杭５の外径よりも、鋼管杭圧入作業が容易な程度に十分大きく形成する。   In the case of FIG. 1 and FIG. 2 showing an embodiment of the present invention, a foundation beam 3 and a structure are formed on a foundation slab 1 of an existing structure via a plurality of anchor reinforcing bars 2. In addition to constructing a newly integrated reinforced concrete footing 4, the new footing 4 is formed with a hole 6 for press-fitting a steel pipe pile 5, and a plurality of anchor plates 7 used as anchor materials are provided in the newly installed footing 4. A plurality of PC steel materials 8 and 8 that are buried and supported in a vertical direction and are set up substantially vertically are installed. The anchor rebar 2 digs a hole in the foundation beam 3 and embeds one end sufficiently deep in the foundation beam 3 and installs the number necessary for structural integration with the new footing 4. The diameter of the press-fitting hole 6 is formed to be sufficiently larger than the outer diameter of the steel pipe pile 5 to such an extent that the steel pipe pile press-in operation is easy.

図１と図２の場合、新設フーチング４は、平面的に見て柱１０を基点に直角２方向に配置された２本の基礎梁３、３に囲まれた内隅部に構造的に一体化した構成で構築しているが、この限りではない。単一の基礎梁３の一側面に隣接する配置で構築して同様に実施することもできる。新設フーチング４の規模（床面積および高さ）は、鋼管杭５の圧入に必要な反力の大きさに応じて決定される。図１中の符号１０ａは柱１０のフーチング基礎を示す。   In the case of FIGS. 1 and 2, the new footing 4 is structurally integrated with an inner corner surrounded by two foundation beams 3 and 3 arranged in two directions at right angles with the pillar 10 as a base point when seen in a plan view. This is not limited to this. It can also be constructed in the same manner by constructing with an arrangement adjacent to one side of the single foundation beam 3. The scale (floor area and height) of the new footing 4 is determined according to the magnitude of the reaction force required for press-fitting the steel pipe pile 5. Reference numeral 10 a in FIG. 1 indicates a footing foundation of the pillar 10.

明瞭に図示することは省略したが、新設フーチング４と接する基礎梁３の表面には、相互間の剪断応力伝達性能を高める凹凸形状を形成し、又は目荒らし等する表面処理を行うことが好ましい。また、図２のように基礎スラブ１に応力伝達要素としてスタッド９を取り付けて、基礎スラブ１と構造的に一体化した新設フーチング４を構築することも好ましい（請求項２記載の発明）。
新設フーチング４に形成する鋼管杭圧入用孔６の孔壁部には、後述するように鋼管杭５との間に充填するコンクリート１７等の固結材との構造的な一体化性能（剪断力の伝達性能）を高める凹凸形状１８を設けることが好ましい（請求項３記載の発明）。 Although illustration is omitted clearly, it is preferable that the surface of the foundation beam 3 that is in contact with the newly installed footing 4 is formed with an uneven shape that enhances the shear stress transmission performance between them or is subjected to a surface treatment such as roughening. . It is also preferable to construct a new footing 4 that is structurally integrated with the foundation slab 1 by attaching a stud 9 as a stress transmission element to the foundation slab 1 as shown in FIG. 2 (invention of claim 2).
Structural integration performance (shearing force) with a solidified material such as concrete 17 filled between the steel pipe pile 5 and the hole wall portion of the steel pipe pile press-fitting hole 6 formed in the new footing 4 is described later. It is preferable to provide a concavo-convex shape 18 that enhances the (transmission performance).

次に、上記のようにして構築した新設フーチング４のコンクリートが所定の強度を発現した後に、上記圧入用孔６の直下の基礎スラブ１をほぼ同形、同大に掘削して開口１１を設ける。そして、前記圧入用孔６及び開口１１を通じて鋼管杭５を垂直に挿入して地盤上に立てる。一方、前記ＰＣ鋼材８、８の上部に反力盤１２を反力の伝達が可能な構造に取り付け、同反力盤１２の下側に鋼管杭圧入用として例えば静的な油圧駆動式等のジャッキ１３を設置し、鋼管杭５を同ジャッキ１３により地盤中へ圧入する。   Next, after the concrete of the new footing 4 constructed as described above develops a predetermined strength, the foundation slab 1 immediately below the press-fitting hole 6 is excavated to have substantially the same shape and the same size to provide the opening 11. Then, the steel pipe pile 5 is vertically inserted through the press-fitting hole 6 and the opening 11 and stands on the ground. On the other hand, a reaction force plate 12 is attached to the upper part of the PC steel materials 8 and 8 in a structure capable of transmitting a reaction force, and for example, a static hydraulic drive type is used for press-fitting a steel pipe pile below the reaction force plate 12. The jack 13 is installed, and the steel pipe pile 5 is press-fitted into the ground by the jack 13.

勿論、高さ制限のある既存構造物の中における鋼管杭５の圧入作業であることを前提にすると、地盤上に立てる鋼管杭５の高さに限度がある。よって、図３に示すように、鋼管杭５は既存構造物の中への搬入および前記ジャッキ１３の直下への建て込みが容易な長さに製作した単位鋼管を用意し、それを溶接継手１４により順次継ぎ足して、鋼管杭５を予定の深度まで圧入する。   Of course, assuming that it is a press-fitting work of the steel pipe pile 5 in an existing structure with a height restriction, there is a limit to the height of the steel pipe pile 5 standing on the ground. Therefore, as shown in FIG. 3, the steel pipe pile 5 is prepared as a unit steel pipe having a length that can be easily carried into an existing structure and installed immediately below the jack 13, and is connected to a welded joint 14. Then, the steel pipe pile 5 is press-fitted to a predetermined depth.

上記のようにして鋼管杭５を地盤中へ所定の深度まで圧入した打ち止め確認後（又はその直前）に、同鋼管杭５の杭頭部外周に応力伝達要素として例えばスタッド１５を取り付け、更に補強鉄筋１６を配筋し、鋼管杭５の杭頭部と新設フーチング４との隙間（鋼管杭圧入用孔６）にコンクリート１７等の固結材を充填し、鋼管杭５の杭頭部と新設フーチング４とを構造的に一体化処理する（図４参照）。このとき、上記したように鋼管杭圧入用孔６の孔壁部に凹凸形状１８を設けておくと、充填したコンクリート等の固結材１７による構造的な一体化の性能（剪断力の伝達性能）を高めることに大いに効果的である。
かくして既存構造物の基礎は鋼管杭５による支持に更新されるので、荷重支持力は大きく増強される。また、地盤に液状化現象の懸念があっても、鋼管杭５に支持される杭基礎となるので不等沈下等の心配もなくなる。 After confirming that the steel pipe pile 5 has been press-fitted into the ground to a predetermined depth as described above (or immediately before), for example, a stud 15 is attached to the outer periphery of the pile head of the steel pipe pile 5 as a stress transmission element and further reinforced. Reinforcing bars 16 are placed, and the gap between the pile head of the steel pipe pile 5 and the new footing 4 (steel pipe pile press-in hole 6) is filled with a solidified material such as concrete 17, and the pile head of the steel pipe pile 5 is newly installed. The footing 4 is structurally integrated (see FIG. 4). At this time, if the concave and convex shape 18 is provided in the hole wall portion of the steel pipe pile press-fitting hole 6 as described above, the performance of structural integration by the solidified material 17 such as filled concrete (shearing force transmission performance) ).
Thus, since the foundation of the existing structure is renewed to be supported by the steel pipe pile 5, the load bearing capacity is greatly enhanced. Moreover, even if there is a concern about the liquefaction phenomenon on the ground, since it becomes a pile foundation supported by the steel pipe pile 5, there is no need to worry about uneven settlement.

以上に本発明を実施例に基づいて説明したが、勿論、図示した実施例の限りではない。本発明の要旨及び技術的思想を逸脱しないかぎり、当業者の変形、応用にしたがい種々な実施例が成立することを、敢えてここに言及する次第である。   Although the present invention has been described based on the embodiments, it is needless to say that the present invention is not limited to the illustrated embodiments. Without departing from the gist and technical idea of the present invention, various embodiments will be realized according to the modifications and applications of those skilled in the art.

鋼管杭の圧入作業の状況を示す平面図である。It is a top view which shows the condition of the press-fitting work of a steel pipe pile. 図１の垂直断面図である。FIG. 2 is a vertical sectional view of FIG. 1. 鋼管杭の圧入・打ち継ぎ要領の説明図である。It is explanatory drawing of the press-fitting and joining procedure of a steel pipe pile. 杭頭部を新設フーチングと一体化した構造を示す断面図である。It is sectional drawing which shows the structure which integrated the pile head with the newly installed footing.

符号の説明Explanation of symbols

１ 基礎スラブ
２ アンカー鉄筋（繋ぎ材）
３ 基礎梁
４ 新設フーチング
５ 鋼管杭
６ 圧入用孔
７ アンカー材（アンカープレート）
８ ＰＣ鋼材
１１ 開口
１２ 反力盤
１３ ジャッキ
１５ スタッド（応力伝達要素）
１６ 補強鉄筋
１７ 固結材（コンクリート）
９ スタッド（応力伝達要素）
１８ 凹凸形状 1 Foundation slab 2 Anchor rebar (connecting material)
3 Foundation beam 4 New footing 5 Steel pipe pile 6 Hole for press-in 7 Anchor material (anchor plate)
8 PC steel material 11 Opening 12 Reaction force board 13 Jack 15 Stud (stress transmission element)
16 Reinforcing bar 17 Solidified material (concrete)
9 Stud (Stress transmission element)
18 Uneven shape

Claims (3)

既存構造物の基礎スラブ上に、アンカー鉄筋等の繋ぎ材を介して基礎梁と構造的に一体化した鉄筋コンクリート造の新設フーチングを構築すると共に、同新設フーチングに鋼管杭の圧入用孔を形成し、且つアンカー材により新設フーチングに支持されてほぼ垂直に立ち上がる複数本のＰＣ鋼材を設置する段階と、
前記新設フーチングのコンクリートが所定の強度を発現した後に、前記圧入用孔の直下の基礎スラブを掘削して開口を設け、前記圧入用孔及び開口を通じて鋼管杭を挿入して地盤上に立て、また、前記ＰＣ鋼材の上部に反力盤を取り付け、同反力盤の下側に鋼管杭圧入用のジャッキを設置し、前記鋼管杭をジャッキにより地盤中へ圧入する段階と、
鋼管杭を地盤中へ所定の深度まで圧入した打ち止め確認後に、同鋼管杭の杭頭部外周にスタッド等の応力伝達要素を取り付け、補強鉄筋を配筋し、鋼管杭の杭頭部と新設フーチングとの間にコンクリート等の固結材を充填して鋼管杭と新設フーチングを構造的に一体化する段階と、
から成ることを特徴とする、鋼管杭圧入による既存構造物の基礎補強工法。 On the foundation slab of the existing structure, a new reinforced concrete footing that is structurally integrated with the foundation beam via a connecting material such as an anchor reinforcement will be constructed, and a press-fit hole for steel pipe piles will be formed in the new footing. And installing a plurality of PC steel materials that are supported by the new footing by the anchor material and rise almost vertically;
After the concrete of the new footing develops a predetermined strength, an opening is made by excavating a foundation slab directly below the press-fitting hole, and a steel pipe pile is inserted through the press-fitting hole and the opening, and standing on the ground. , Attaching a reaction force board to the upper part of the PC steel material, installing a jack for pressing the steel pipe pile below the reaction force board, and press-fitting the steel pipe pile into the ground with the jack;
After confirming that the steel pipe pile has been press-fitted into the ground to the specified depth, a stress transmission element such as a stud is attached to the outer periphery of the pile head of the steel pipe pile, reinforcing reinforcing bars are placed, and the pile head of the steel pipe pile and the newly installed footing Filling a solidified material such as concrete between the steel pipe pile and the new footing structurally,
A foundation reinforcement method for existing structures by press-fitting steel pipe piles. 新設フーチングと接する基礎梁の表面に応力伝達性能を高める凹凸形状を形成する表面処理を行い、また、基礎スラブにスタッド等の応力伝達要素を取り付けて、基礎梁及び基礎スラブと構造的に一体化した新設フーチングを構築することを特徴とする、請求項１に記載した鋼管杭圧入による既存構造物の基礎補強工法。   The surface of the foundation beam in contact with the new footing is surface-treated to form an uneven shape that enhances the stress transmission performance, and stress transmission elements such as studs are attached to the foundation slab to structurally integrate with the foundation beam and foundation slab. 2. A foundation reinforcing method for an existing structure by press-fitting a steel pipe pile according to claim 1, wherein the new footing is constructed. 新設フーチングに形成する鋼管杭の圧入用孔の孔壁部に、鋼管杭との間に充填するコンクリート等の固結材との構造的な一体化性能を高める凹凸形状を設けることを特徴とする、請求項１に記載した鋼管杭圧入による既存構造物の基礎補強工法。


The hole wall of the hole for press-fitting of the steel pipe pile formed in the new footing is provided with an uneven shape that enhances the structural integration performance with the solidified material such as concrete filled between the steel pipe pile. The foundation reinforcement method of the existing structure by the steel pipe pile press-fit described in claim 1.


JP2004249468A 2004-08-30 2004-08-30 Foundation reinforcement method for existing structures by press-fitting steel pipe piles Expired - Fee Related JP3899094B2 (en)

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