JP3733533B2 - Foundation reinforcement method under pressure of existing structures - Google Patents

Foundation reinforcement method under pressure of existing structures Download PDF

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JP3733533B2
JP3733533B2 JP2003329749A JP2003329749A JP3733533B2 JP 3733533 B2 JP3733533 B2 JP 3733533B2 JP 2003329749 A JP2003329749 A JP 2003329749A JP 2003329749 A JP2003329749 A JP 2003329749A JP 3733533 B2 JP3733533 B2 JP 3733533B2
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steel pipe
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pipe pile
foundation slab
fitting
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努 並河
雅路 青木
富男 土屋
芳雄 平井
康則 椿原
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Takenaka Corp
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Description

この発明は、既存構造物の改修、増築などによる荷重増加や液状化対策として、新たに鋼管杭を増設して基礎を補強する技術の分野、とりわけ図１に例示したように既存構造物１が地下階を有し、その基礎スラブ２が地下水の水位Ｗより以下（被圧水下）に位置する条件下で、その基礎スラブ２を貫通する鋼管杭３を圧入して増設する基礎補強方法であって、地下水の噴出を防止した圧入方式による鋼管杭の圧入施工法の技術分野に属する。   The present invention relates to the field of technology for reinforcing a foundation by newly adding a steel pipe pile as a countermeasure against an increase in load or liquefaction due to renovation or expansion of an existing structure, in particular, as shown in FIG. A foundation reinforcement method in which a steel pipe pile 3 that penetrates the foundation slab 2 is press-fitted under the condition that the foundation slab 2 has a basement floor and the foundation slab 2 is located below (under pressure water) from the groundwater level W. Therefore, it belongs to the technical field of the steel pipe pile press-in construction method by the press-in method that prevents the ejection of groundwater.

従来、既存構造物の改修、増築による荷重増加や液状化対策として、新たに鋼管杭を打設する技術は、既に実施もされており、例えば下記の特許文献１或いは２にも関連技術が開示されている。
特許文献１に開示された鋼製部材の溶接・圧入装置および溶接・圧入工法は、既存構造物の地下階の如く空間的制限、特に高さ制限がある場所での実施に好適な技術で、本願発明の実施にも利用可能な技術である。要するに、鋼製部材を掴み又は解放するクランプ手段を備え、単位長さで継ぎ足す鋼製部材の接合位置の上下を掴む一対のクランプ機構、および前記上下一対のクランプ機構を相互に接近させ又は離間させるアプセット用アクチュエータ、並びに鋼製部材の接合位置を溶接する溶接用電極を備えて成り、高さ制限がある場所でも鋼製部材の圧入工程と溶接工程を段取り替え無しで速やかに合理的に連続施工できる技術である。 Conventionally, a technique for newly placing a steel pipe pile as a countermeasure against load increase or liquefaction due to renovation and expansion of an existing structure has already been implemented. For example, the related technique is also disclosed in Patent Document 1 or 2 below. Has been.
The welding / press-in apparatus and welding / press-in method for steel members disclosed in Patent Document 1 are technologies suitable for implementation in places where there is a spatial restriction, particularly a height restriction, such as an underground floor of an existing structure, This is a technique that can also be used to implement the present invention. In short, a clamp means for gripping or releasing a steel member, a pair of clamp mechanisms for gripping the upper and lower positions of the joining position of the steel member to be added by a unit length, and the pair of upper and lower clamp mechanisms approaching or separating from each other Upset actuator and welding electrode for welding the joining position of steel members, and the press-fitting process and welding process of steel members can be carried out quickly and reasonably without changeover even in places where height is limited It is a technology that can be applied.

特許文献２に開示された外巻き鋼管の圧入による既存杭の補強方法は、杭で支持された構造物の既存杭を使用状態のまま補強する方法であって、基礎スラブの下の地盤を掘削して既存杭の杭頭部を露出させる作業スペースを形成し、この作業スペースにおいて、杭頭部の外周に半割形状の外巻き鋼管ユニットを組み立てて巻き付ける。この外巻き鋼管ユニットは圧入装置により既存杭に沿って地中に圧入する。以下、同様な工程を繰り返して既存杭の補強対象範囲を外巻き鋼管で巻き、既存杭と外巻き鋼管の間隙に充填材を充填して固め耐震補強を行う技術である。   The method of reinforcing an existing pile by press-fitting an externally wound steel pipe disclosed in Patent Document 2 is a method of reinforcing an existing pile of a structure supported by the pile as it is in use, and excavating the ground below the foundation slab Then, a work space for exposing the pile head of the existing pile is formed, and in this work space, a half-shaped outer wound steel pipe unit is assembled and wound around the outer periphery of the pile head. This externally wound steel pipe unit is press-fitted into the ground along the existing pile by a press-fitting device. In the following, the same process is repeated to wind the reinforcement target area of the existing pile with an outer-wound steel pipe, fill the gap between the existing pile and the outer-wound steel pipe with a filler, and perform the seismic reinforcement.

特開２００２−３８４７８号公報JP 2002-38478 A 特開平１０−１３１１７６号公報JP-A-10-131176

上記した特許文献１及び２に開示された技術は、それぞれ有用な内容ではある。しかしながら、本発明が目的とするのは、図１に例示したように、既存構造物１が地下階を有しており、その基礎スラブ２が地下水の水位Ｗより以下（被圧水下）に位置する条件下で、その基礎スラブ２を貫通する鋼管杭３を圧入して増設する基礎補強方法であって、地下水の噴出を防止した圧入方式による鋼管杭の圧入施行法を開発することである。しかし、特許文献１及び２に開示された技術はこうした目的を達成する内容にはなっていない。その他にも、鋼管杭の圧入時における止水性を確保した施工法、或いは水の噴出を防止した圧入方式による鋼管杭の施工法は、現状のところ見当たらない。   The technologies disclosed in Patent Documents 1 and 2 described above are useful contents. However, the present invention has an object, as illustrated in FIG. 1, in which the existing structure 1 has an underground floor, and the foundation slab 2 is below the groundwater level W (under pressure water). It is a foundation reinforcement method to press-in and expand a steel pipe pile 3 that penetrates the foundation slab 2 under the located condition, and is to develop a method for injecting a steel pipe pile by a press-in method that prevents the ejection of groundwater . However, the techniques disclosed in Patent Documents 1 and 2 are not intended to achieve such an object. In addition, there is currently no construction method that ensures water-stopping at the time of press-fitting of steel pipe piles or construction method of steel pipe piles by a press-fitting method that prevents water jetting.

本発明の目的は、既存構造物が地下階を有し、その基礎スラブが地下水の水位以下（被圧水下）に位置する条件下で、その基礎スラブを貫通する鋼管杭を圧入して増設する基礎補強方法であって、地下水の噴出を防止した圧入方式による鋼管杭の施工法を提供することである。   The object of the present invention is to press-fit a steel pipe pile that penetrates the foundation slab under the condition that the existing structure has an underground floor and the foundation slab is below the groundwater level (under pressurized water). It is a foundation reinforcement method to be used, and is to provide a method for constructing steel pipe piles by a press-fitting method that prevents ejection of groundwater.

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既存構造物の被圧水下の基礎補強方法は、
既存構造物１の被圧水下の基礎スラブ２を貫通する鋼管杭３を圧入して増設する基礎補強方法であって、
基礎スラブ２の杭増設部位の表層部を削り取って所定深さの凹部５を形成する段階と、
前記凹部５の底面から下向きに鋼管杭３と同径で先端にリングビット７を備えたケーシングパイプ６により基礎スラブ２を残り厚部分が水圧に耐える深さまで削孔する段階と、
前記ケーシングパイプ６を引き抜いて、内部に止水板９を設置した鋼管杭ユニット３ａと交換し、前記凹部５の底面上に止水材付の圧入ガイド１０を設置し、前記圧入ガイド１０の中へ前記鋼管杭ユニット３ａを通し、この鋼管杭ユニット３ａの圧入により、基礎スラブ２の前記残り厚部分を打ち抜く段階と、
以下、鋼管杭ユニット３ａの圧入と、溶接による継ぎ足しとを繰り返して所定の支持力が得られる深さまで鋼管杭３の圧入を行う段階と、
鋼管杭３の圧入打ち止めを確認した後に、基礎スラブ２の前記凹部５内に配筋を行うなどしてコンクリート等の充填材１５を打設し、鋼管杭３と基礎スラブ２の間の止水処理と一体化処理を行う段階とよりなることをそれぞれ特徴とする。 As a means for solving the above-described problems of the prior art, a foundation reinforcing method under pressure of an existing structure according to the invention described in claim 1 is:
A foundation reinforcement method in which a steel pipe pile 3 penetrating a foundation slab 2 under a pressurized water of an existing structure 1 is press-fitted and added.
Scraping off the surface layer of the pile extension site of the foundation slab 2 to form the recess 5 of a predetermined depth;
Drilling the foundation slab 2 downward from the bottom surface of the recess 5 to the depth where the remaining thick portion can withstand water pressure by the casing pipe 6 having the same diameter as the steel pipe pile 3 and the ring bit 7 at the tip;
The casing pipe 6 is pulled out and replaced with a steel pipe pile unit 3a in which a water stop plate 9 is installed. A press-in guide 10 with a water stop material is installed on the bottom surface of the recess 5, and the press-in guide 10 Through the steel pipe pile unit 3a, and punching the remaining thickness portion of the foundation slab 2 by press-fitting the steel pipe pile unit 3a;
Hereinafter, the step of press-fitting the steel pipe pile 3 to a depth at which a predetermined supporting force is obtained by repeating the press-fitting of the steel pipe pile unit 3a and the addition by welding,
After confirming the press-fitting stop of the steel pipe pile 3, a filler 15 such as concrete is placed by placing a bar in the concave portion 5 of the foundation slab 2, and the water stoppage between the steel pipe pile 3 and the foundation slab 2 is performed. It is characterized by comprising the steps of performing processing and integration processing.

請求項１に記載した発明に係る既存構造物の被圧水下の基礎補強方法によれば、地下階を有する既存構造物１の被圧水下の基礎スラブ２を貫通する鋼管杭３を圧入して増設することが可能であるから、同既存構造物１の改修、増築などによる自重荷重の増加や増床面積に対する基礎の補強対策として、或いは液状化に対する耐震補強対策として広く応用実施でき、もって既存構造物１の用途や機能の拡大、充実に大いに寄与する。   According to the foundation reinforcement method under pressured water of the existing structure according to the invention described in claim 1, the steel pipe pile 3 penetrating the foundation slab 2 under pressured water of the existing structure 1 having an underground floor is press-fitted. Since it can be expanded, it can be widely applied as a foundation reinforcement measure for the increase in its own weight load and floor area due to renovation and extension of the existing structure 1, or as a seismic reinforcement measure against liquefaction, This greatly contributes to the expansion and enhancement of applications and functions of the existing structure 1.

先ず、既存構造物１の被圧水下の基礎スラブ２の杭増設部位の表層部を削り取って所定深さの凹部５を形成する。次に、前記凹部５の底面から下向きに、鋼管杭３と同径で先端にリングビット７を備えたケーシングパイプ６により、基礎スラブ２を残り厚部分が水圧に耐える深さまで削孔する。しかる後に、前記ケーシングパイプ６を引き抜き、代わりに内部に止水板９を設置した鋼管杭ユニット３ａを用意する。前記凹部５の底面上に止水材付の圧入ガイド１０を設置し、この圧入ガイド１０の中へ前記鋼管杭ユニット３ａを通す。この鋼管杭ユニット３ａの圧入により、基礎スラブ２の前記残り厚部分を打ち抜く。以下、鋼管杭ユニット３ａの圧入と、溶接による継ぎ足しとを繰り返して所定の支持力が得られる深さまで鋼管杭３の圧入を行う。こうして鋼管杭３の圧入打ち止めを確認した後に、基礎スラブ２の前記凹部５内に配筋を行うなどしてコンクリート等の充填材１５を打設して、鋼管杭３と基礎スラブ２の間の止水処理と一体化処理を行う。   First, the surface layer portion of the pile extension portion of the foundation slab 2 under the pressurized water of the existing structure 1 is scraped to form the concave portion 5 having a predetermined depth. Next, the foundation slab 2 is drilled downward from the bottom surface of the recess 5 to the depth where the remaining thick portion can withstand water pressure by the casing pipe 6 having the same diameter as the steel pipe pile 3 and the ring bit 7 at the tip. After that, the steel pipe pile unit 3a in which the casing pipe 6 is pulled out and a water stop plate 9 is installed instead is prepared. A press-fit guide 10 with a water stop material is installed on the bottom surface of the recess 5, and the steel pipe pile unit 3 a is passed through the press-fit guide 10. The remaining thickness portion of the foundation slab 2 is punched out by press-fitting the steel pipe pile unit 3a. Hereinafter, the steel pipe pile 3 is press-fitted to a depth at which a predetermined supporting force is obtained by repeating the press-fitting of the steel pipe pile unit 3a and the addition by welding. After confirming the press-fitting and stopping of the steel pipe pile 3 in this way, a filler 15 such as concrete is placed by placing a bar in the concave portion 5 of the foundation slab 2, so that the space between the steel pipe pile 3 and the foundation slab 2 is Performs water stop treatment and integrated treatment.

図２は、図１に例示したように地下階を有する既存構造物１において、地下水の水位より下方の被圧水下に位置する基礎スラブ２を貫通する鋼管杭３を圧入して増設する基礎補強方法の実施にあたり、先ず基礎スラブ２の杭増設部位の表層部を削り取って（又は、はつりとって）所定深さの凹部５を形成した段階を示す。因みに、この凹部５の広さと平面形状及び深さに関しては、図４に示すように止水材付の圧入ガイド１０を設置したり、あるいは、図７に示すようにコンクリート等の充填材１５を打設して前記の圧入ガイド１０を埋め殺し、且つ鋼管杭３と基礎スラブ２の間の止水処理と一体化処理を行い、好ましくは基礎スラブ２の上面に平坦面を復元するのに好適な寸法仕様とする。   FIG. 2 shows a foundation in which a steel pipe pile 3 penetrating through a foundation slab 2 that is located under pressurized water below the groundwater level is press-fitted in an existing structure 1 having an underground floor as illustrated in FIG. In carrying out the reinforcing method, first, the stage in which the surface layer portion of the pile extension portion of the foundation slab 2 is scraped (or lifted) to form the concave portion 5 having a predetermined depth is shown. Incidentally, with respect to the width, planar shape and depth of the recess 5, a press-fitting guide 10 with a water stop material is installed as shown in FIG. 4, or a filler 15 such as concrete is used as shown in FIG. It is suitable for restoring the flat surface on the upper surface of the foundation slab 2, preferably performing the water stop treatment and the integration treatment between the steel pipe pile 3 and the foundation slab 2 by burying and burying the above-mentioned press-fitting guide 10 Use dimensional specifications.

図３は、上記のように形成した凹部５の底面から下向きに、鋼管杭３と同径（ちなみに鋼管杭３の外径は４５０mm程度）で先端にリングビット７を備えたケーシングパイプ６により、基礎スラブ２を、残りの厚さ部分が水圧に耐える限界の深さまで、例えば残り数mmないし１０数mm程度まで削孔した段階を示す。したがって、この段階で、掘削部から地下水が噴出することは決してない。ケーシングパイプ６により基礎スラブ２を掘削する具体的手段としては、図示することは省略したが、ケーシングパイプ６を回転しつつ下向きに掘進させる公知の回転式掘削装置を使用して行う。   FIG. 3 shows a casing pipe 6 having the same diameter as the steel pipe pile 3 (the outer diameter of the steel pipe pile 3 is about 450 mm) and a ring bit 7 at the tip, downward from the bottom surface of the recess 5 formed as described above. The stage in which the basic slab 2 has been drilled to the limit depth at which the remaining thickness portion can withstand water pressure, for example, the remaining several mm to several ten mm is shown. Therefore, at this stage, groundwater will never be ejected from the excavated part. As a concrete means for excavating the foundation slab 2 with the casing pipe 6, although not shown, it is performed using a known rotary excavator that excavates the casing pipe 6 downward while rotating.

図４は、上記のようにケーシングパイプ６で基礎スラブ２を残りの厚さ部分が水圧に耐える限界の深さまで掘削した後に、前記ケーシングパイプ６を引き抜き、代わりに中空部内の上端部近傍に止水板９を設置した鋼管杭ユニット３ａと交換し、その一方で、前記凹部５の底面上に止水材付の圧入ガイド１０を設置し、前記圧入ガイド１０の中へ前記鋼管杭ユニット３ａを通し、この鋼管杭ユニット３ａの圧入により、基礎スラブ２の前記のように残された厚さ部分を打ち抜いた段階を示す。鋼管杭ユニット３ａの圧入には、例えば上記特許文献１に開示されたような圧入装置を使用する。鋼管杭ユニット３ａは、当然のことながら、地下階構造における上階スラブの高さ制限に適合する単位長さに用意して圧入装置へセットし圧入作業を行う。鋼管杭ユニット３ａは、その内部の上端部近傍に止水板９を設置した構造であるから、基礎スラブ２を打ち抜いた段階で地下水が鋼管杭ユニット３ａを通じて噴出する事故も生じない。   FIG. 4 shows that, after excavating the foundation slab 2 with the casing pipe 6 to a depth where the remaining thickness portion can withstand the water pressure, the casing pipe 6 is pulled out, and instead is stopped near the upper end in the hollow portion. It replaces with the steel pipe pile unit 3a which installed the water plate 9, On the other hand, the press-fit guide 10 with a water stop material is installed on the bottom face of the said recessed part 5, and the said steel pipe pile unit 3a is put in the said press-fit guide 10 Through, the stage which punched out the remaining thickness part of the foundation slab 2 by the press injection of this steel pipe pile unit 3a is shown. For press-fitting of the steel pipe pile unit 3a, for example, a press-fitting device as disclosed in Patent Document 1 is used. As a matter of course, the steel pipe pile unit 3a is prepared to a unit length suitable for the height restriction of the upper slab in the basement structure and set in the press-fitting device to perform the press-fitting operation. Since the steel pipe pile unit 3a has a structure in which the water blocking plate 9 is installed in the vicinity of the upper end portion in the interior thereof, there is no accident that groundwater is ejected through the steel pipe pile unit 3a when the foundation slab 2 is punched out.

図５は、上記した止水材付き圧入ガイド１０の詳細な設置構造を拡大して示す。これは中央部に鋼管杭３の外径よりも少し大きい口径の貫通孔を有する底板１０ａと、底板１０ａの上に前記貫通孔と同心の配置で固定されたガイド筒１０ｂとから成る。底板１０ａは凹部５の底面との間にリング状の止水材１３を敷き込んだ上で、凹部５の底面に予めホールインアンカー等の手段で設置したアンカーボルト１２と緊結して強固に固定されている。前記ガイド筒１０ｂの内周面には、鋼管杭３（又は鋼管杭ユニット３ａ）の圧入動作を案内するベアリング材１４、およびその下方部位には鋼管杭３との隙間を水封処理する止水材１３’がそれぞれ設置されている。したがって、鋼管杭ユニット３ａが、上記したように基礎スラブ２を打ち抜いた段階で地下水が噴出する事故の虞はないのである。もっとも、止水材付き圧入ガイド１０の構成は前記の限りではなく、同様の作用効果を奏するものであれば、適宜に選択して採用し実施できる。   FIG. 5 shows an enlarged detailed installation structure of the above-mentioned press-fitting guide 10 with a water stop material. This comprises a bottom plate 10a having a through hole having a diameter slightly larger than the outer diameter of the steel pipe pile 3 at the center, and a guide tube 10b fixed on the bottom plate 10a in a concentric arrangement with the through hole. The bottom plate 10a is laid with a ring-shaped water-stopping material 13 between the bottom surface of the concave portion 5, and is firmly fixed to the bottom surface of the concave portion 5 by being tightly coupled to an anchor bolt 12 previously installed by means such as a hole-in anchor. Has been. A bearing member 14 for guiding the press-fitting operation of the steel pipe pile 3 (or the steel pipe pile unit 3a) is provided on the inner peripheral surface of the guide tube 10b, and a water stop treatment for water-sealing the gap with the steel pipe pile 3 at a lower portion thereof. Each material 13 'is installed. Therefore, there is no risk of an accident in which groundwater is ejected when the steel pipe pile unit 3a punches the foundation slab 2 as described above. However, the configuration of the press-fitting guide 10 with a water stop material is not limited to the above, and can be appropriately selected and adopted as long as it has the same function and effect.

図６は、以下同様にして、鋼管杭ユニット３ａの圧入と、鋼管杭ユニット３ａ相互の継ぎ目８を溶接により接合して継ぎ足す作業を繰り返して、所定の支持力が得られる深さまで鋼管杭３の圧入を進める途中の段階を示している。   6 repeats the press fitting of the steel pipe pile unit 3a and the work of joining the joints 8 of the steel pipe pile units 3a by welding and adding the steel pipe pile 3 to a depth where a predetermined supporting force can be obtained. The stage in the middle of proceeding with press-fitting is shown.

図７は、上記のようにして鋼管杭３を所定の支持力が得られる深さまで圧入したことが計測手段により確認され、もって鋼管杭３の圧入打ち止めが確認された後に、基礎スラブ２の前記凹部５内に配筋を行うなどしてコンクリートやモルタルその他の固結充填材１５を打設して、上記の止水材付き圧入ガイド１０をそのまま埋め殺すと共に、鋼管杭３と基礎スラブ２の間の止水処理、および一体化処理を行った最終段階を示している。
したがって、基礎スラブ２から鋼管杭３へと鉛直荷重の伝達が行われる。図示例の場合、鋼管杭３は、その杭頭部が凹部５へ打設した充填材１５の中へ埋め殺しとなる高さに切除され、充填材１５の上面は基礎スラブ２の上面とほぼ面一の平坦面に形成されている。
もっとも、最終段階の形態は図７の限りではなく、例えば鋼管杭３の杭頭を基礎スラブ２の上面よりも高く突き出させて、上階構造との取り合いにより鉛直荷重を鋼管杭３へ効果的に伝達する機構その他を構築することも、機能的必要性に応じて適宜に実施される。 FIG. 7 shows that the steel pipe pile 3 is press-fitted to a depth at which a predetermined supporting force can be obtained as described above, and the press of the steel pipe pile 3 is confirmed. Concrete, mortar and other consolidated fillers 15 are placed by placing reinforcing bars in the recesses 5, and the above-mentioned press-fitting guide 10 with a water stop material is buried as it is, and the steel pipe pile 3 and the foundation slab 2 The final stage which performed the water stop process in between and the integration process is shown.
Therefore, a vertical load is transmitted from the foundation slab 2 to the steel pipe pile 3. In the case of the illustrated example, the steel pipe pile 3 is cut to a height at which the pile head is buried in the filler 15 placed in the recess 5, and the upper surface of the filler 15 is substantially the same as the upper surface of the foundation slab 2. It is formed on the same flat surface.
However, the form of the final stage is not limited to that shown in FIG. 7. For example, the pile head of the steel pipe pile 3 is protruded higher than the upper surface of the foundation slab 2, and the vertical load is effectively applied to the steel pipe pile 3 by engaging with the upper floor structure. Construction of a mechanism for transmitting to the other is also performed as appropriate according to the functional necessity.

地下階を有する既存構造物の被圧水下の基礎スラブを貫通する鋼管杭を圧入して増設する実施形態を例示した断面図である。It is sectional drawing which illustrated embodiment which press-fits and adds the steel pipe pile which penetrates the foundation slab under the pressurized water of the existing structure which has an underground floor. 基礎スラブへ凹部を形成した状態を示す断面図である。It is sectional drawing which shows the state which formed the recessed part in the basic | foundation slab. 凹部の底面をケーシングパイプで削孔する段階を示した断面図である。It is sectional drawing which showed the step which drills the bottom face of a recessed part with a casing pipe. 凹部の底面へ止水材付き圧入ガイドを設置し鋼管杭ユニットによる削孔を進める段階を示した断面図である。It is sectional drawing which showed the step which installs the press-fit guide with a water stop material to the bottom face of a recessed part, and advances the drilling by a steel pipe pile unit. 止水材付き圧入ガイドを拡大して示す断面図である。It is sectional drawing which expands and shows the press-fit guide with a water stop material. 鋼管杭ユニットを継ぎ足して圧入を進める段階を示した断面図である。It is sectional drawing which showed the step which adds a steel pipe pile unit and advances press-fit. 鋼管杭の圧入を完了し杭頭部の処理も行った段階を示す断面図である。It is sectional drawing which shows the step which completed the press injection of the steel pipe pile and also processed the pile head.

符号の説明Explanation of symbols

１ 既存構造物
２ 基礎スラブ
３ 鋼管杭
５ 凹部
６ ケーシングパイプ
７ リングビット
３ａ 鋼管杭ユニット
９ 止水板
１０ 圧入ガイド
１３、１３’止水材
１５ 充填材 DESCRIPTION OF SYMBOLS 1 Existing structure 2 Foundation slab 3 Steel pipe pile 5 Recess 6 Casing pipe 7 Ring bit 3a Steel pipe pile unit 9 Water stop plate 10 Press-fitting guide
13, 13 'water stop material 15 filler

Claims (1)

既存構造物の被圧水下の基礎スラブを貫通する鋼管杭を圧入して増設する基礎補強方法であって、
基礎スラブの杭増設部位の表層部を削り取って所定深さの凹部を形成する段階と、
前記凹部の底面から下向きに鋼管杭と同径で先端にリングビットを備えたケーシングパイプにより基礎スラブを残り厚部分が水圧に耐える深さまで削孔する段階と、
前記ケーシングパイプを引き抜いて、内部に止水板を設置した鋼管杭ユニットと交換し、前記凹部の底面上に止水材付の圧入ガイドを設置し、前記圧入ガイドの中へ前記鋼管杭ユニットを通し、この鋼管杭ユニットの圧入により、基礎スラブの前記残り厚部分を打ち抜く段階と、
以下、鋼管杭ユニットの圧入と、溶接による継ぎ足しとを繰り返して所定の支持力が得られる深さまで鋼管杭の圧入を行う段階と、
鋼管杭の圧入打ち止めを確認した後に、基礎スラブの前記凹部内に配筋を行うなどしてコンクリート等の充填材を打設し、鋼管杭と基礎スラブ間の止水処理と一体化処理を行う段階とよりなることをそれぞれ特徴とする、既存構造物の被圧水下の基礎補強方法。

































A foundation reinforcement method in which a steel pipe pile penetrating a foundation slab under pressured water of an existing structure is press-fitted and added,
Scraping the surface layer of the pile extension part of the foundation slab to form a recess with a predetermined depth;
Drilling the foundation slab with a casing pipe having the same diameter as the steel pipe pile and a ring bit at the tip downward from the bottom surface of the recess to a depth at which the remaining thickness portion can withstand water pressure;
Pull out the casing pipe, replace the steel pipe pile unit with a water stop plate installed inside, install a press-fit guide with a water stop material on the bottom surface of the recess, and place the steel pipe pile unit into the press-fit guide. Through, punching out the remaining thickness portion of the foundation slab by press-fitting this steel pipe pile unit;
Hereinafter, the step of press-fitting the steel pipe pile to a depth at which a predetermined supporting force is obtained by repeating the press-fitting of the steel pipe pile unit and the addition by welding,
After confirming the press-fitting stop of the steel pipe pile, place a filler in the concave part of the foundation slab and place a filler such as concrete to perform a water stop treatment and an integrated treatment between the steel pipe pile and the foundation slab. A method of reinforcing a foundation under pressure of an existing structure, characterized by comprising steps.

































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