JP2017122364A - Foundation structure using existing pile - Google Patents

Foundation structure using existing pile Download PDF

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JP2017122364A
JP2017122364A JP2016002587A JP2016002587A JP2017122364A JP 2017122364 A JP2017122364 A JP 2017122364A JP 2016002587 A JP2016002587 A JP 2016002587A JP 2016002587 A JP2016002587 A JP 2016002587A JP 2017122364 A JP2017122364 A JP 2017122364A
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existing pile
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foundation
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JP6664697B2 (en
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英之 眞野
Hideyuki Mano
英之 眞野
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a foundation structure using an existing pile which can apply a load corresponding to support capacities of an existing plie and a new foundation slab, and can suitably reuse the existing pile.SOLUTION: A foundation structure is formed by possessing a prescribed yield load level which is decided from the yield strength of a new foundation slab 2 and a support force of an existing pile 1 between the existing pile 1 and the new foundation slab 2, or between the existing pile 1, an existing foundation slab and the new foundation slab 2, and has a plie head load adjustment member 3 for adjusting a load which acts on the existing pile 1.SELECTED DRAWING: Figure 1

Description

本発明は、既存杭を再利用してなる基礎構造に関する。   The present invention relates to a foundation structure formed by reusing an existing pile.

従来、老朽化した建物の新設、再開発などを行う場合に、既存の建物の地上部を解体した後、既存の建物の基礎杭（既存杭）を残した状態でその地盤上に新しい建物を構築し、既存杭と新設杭で建物を支持する工法が提案、実用化されている（例えば、特許文献１、特許文献２、特許文献３、特許文献４参照）。   Conventionally, when new or redevelopment of an old building is performed, after the ground part of the existing building is dismantled, a new building is built on the ground while leaving the foundation pile (existing pile) of the existing building. A construction method for constructing and supporting a building with an existing pile and a new pile has been proposed and put to practical use (for example, see Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4).

一方、このような既存杭を再利用する場合には、既存杭と新設建物の柱の位置が異なるため、新設基礎スラブには柱位置と異なる場所に既存杭からの反力によって大きな応力が生じる。このため、基礎スラブを厚くするなどの対策を講じる必要がある。   On the other hand, when reusing such existing piles, the positions of the pillars of the existing piles and the new building are different, so the new foundation slab is subjected to large stress due to the reaction force from the existing piles at a location different from the column position. . For this reason, it is necessary to take measures such as thickening the foundation slab.

また、既存杭の支持力が小さく、新設建物の荷重が大きい場合には、既存杭に許容支持力を超える荷重が作用することがある。   Moreover, when the bearing capacity of the existing pile is small and the load of the new building is large, a load exceeding the allowable bearing capacity may act on the existing pile.

これに対し、既存杭の上端部周辺の地盤を壺掘りし、既存杭の上端部を切除した後、周辺地盤よりも剛性の小さい材料で埋め戻したり、スタイロフォーム（商標）のような低剛性材を挟むことによって既存杭が新設基礎に与える応力集中を緩和する手法が提案、実用化されている。   On the other hand, after excavating the ground around the upper end of the existing pile and cutting the upper end of the existing pile, it is backfilled with a material that is less rigid than the surrounding ground, or a low-rigidity material such as Styrofoam (trademark) A method to relieve stress concentration caused by existing piles on the new foundation by sandwiching slab is proposed and put into practical use.

特開２０１０−１３３２０６号公報JP 2010-133206 A 特開２０１２−２４６６５６号公報JP 2012-246656 A 特開２０１２−１１２２１８号公報JP 2012-112218 A 特開２００３−８２６８８号公報JP 2003-82688 A

しかしながら、既存杭の支持力が小さい場合の対策においては、既存杭の杭頭の切除長さや、どのような材料をどのような密度で埋め戻すかなどの材料、締固め度などの施工条件によって既存杭に作用する荷重が変化する。このため、基礎スラブに作用する荷重を安全な範囲に抑える明確な仕様を規定することが困難である。   However, in measures when the bearing capacity of existing piles is small, depending on construction conditions such as the length of the pile piles excised, the materials to be backfilled at what density, the compaction degree, etc. The load acting on the existing pile changes. For this reason, it is difficult to specify a clear specification that keeps the load acting on the foundation slab within a safe range.

また、新設杭と既存杭の沈下剛性比によっては、既存杭頭を大きく切除する必要があり、例えば既存杭が山留め壁に近接する位置にあるなど、深い掘削が適用しにくい条件下では施工ができなくなることも考えられる。   Also, depending on the settlement rigidity ratio of the new pile and the existing pile, it is necessary to cut the existing pile head greatly.For example, the existing pile is located in the vicinity of the retaining wall. It may be impossible.

さらに、地盤材料を規定された軟らかい剛性となるように精度よく制御して施工することは非常に難しく、信頼性を確保することも難しい。このため、このような処理を行った既存杭部分の地反力を期待しない設計とすることになり、剛性、支持力が高い既存杭が無駄になってしまう。   Furthermore, it is very difficult to control the ground material with high precision so as to have a prescribed soft rigidity, and it is also difficult to ensure reliability. For this reason, it will be set as the design which does not expect the ground reaction force of the existing pile part which performed such a process, and the existing pile with high rigidity and supporting force will be wasted.

また、既存杭を杭として再利用する場合でも、設計は既存建物の解体前に行われることが多く、解体後に調査した杭の位置、性状などが設計で設定したものと大きく異なると、設計のやり直しが必要になり、時間や労力の大幅なロスを招くことになる。   Even when an existing pile is reused as a pile, the design is often performed before the dismantling of the existing building.If the position and properties of the pile investigated after the dismantling are significantly different from those set in the design, It will be necessary to start over, resulting in a significant loss of time and effort.

本発明は、上記事情に鑑み、既存杭や新設基礎スラブの支持能力に応じた荷重を負担させることができ、好適に既存杭を再利用することを可能にする既存杭を利用した基礎構造を提供することを目的とする。   In view of the above circumstances, the present invention can load a load according to the support capacity of an existing pile or a newly-founded foundation slab, and preferably uses a foundation structure using an existing pile that enables the existing pile to be reused. The purpose is to provide.

上記の目的を達するために、この発明は以下の手段を提供している。   In order to achieve the above object, the present invention provides the following means.

本発明の既存杭を利用した基礎構造は、既存杭と新設基礎スラブの間、もしくは既存杭及び既存基礎スラブと新設基礎スラブの間に、前記新設基礎スラブの耐力と前記既存杭の支持力から決まる所定の降伏荷重度を備えて形成され、前記既存杭に作用する荷重を調節する杭頭荷重調節部材を設けて構成されていることを特徴とする。   The foundation structure using the existing pile of the present invention is based on the strength of the new foundation slab and the bearing capacity of the existing pile between the existing pile and the new foundation slab, or between the existing pile and the existing foundation slab and the new foundation slab. A pile head load adjusting member that adjusts the load acting on the existing pile is provided with a predetermined degree of yield load determined.

また、本発明の既存杭を利用した基礎構造においては、前記既存杭の杭頭部に、見掛けの杭頭断面積を大にする拡頭部材が設けられていることが望ましい。   Moreover, in the foundation structure using the existing pile of this invention, it is desirable for the pile head of the said existing pile to be provided with the head expansion member which enlarges an apparent pile head cross-sectional area.

また、本発明の既存杭を利用した基礎構造においては、前記杭頭荷重調節部材が、降伏荷重が異なる複数の部材を一体にして構成されていることがさらに望ましい。   Moreover, in the foundation structure using the existing pile of this invention, it is further more preferable that the said pile head load adjustment member is comprised integrally from the several member from which a yield load differs.

さらに、本発明の既存杭を利用した基礎構造においては、前記既設杭の杭頭部から突出させた杭頭鉄筋を、前記杭頭荷重調節部材を介して前記新設基礎スラブに接続して構成されていることが望ましい。   Furthermore, in the foundation structure using the existing pile of the present invention, the pile head reinforcing bar protruding from the pile head of the existing pile is connected to the newly established foundation slab via the pile head load adjusting member. It is desirable that

また、本発明の既存杭を利用した基礎構造においては、新設構造物の沈下を考慮して前記杭頭荷重調節部材の弾性と厚さが設定されていることがより望ましい。   Moreover, in the foundation structure using the existing pile of this invention, it is more desirable that the elasticity and thickness of the said pile head load adjustment member are set in consideration of the settlement of a new structure.

本発明の既存杭を利用した基礎構造においては、既存杭の杭頭荷重を一定以下に抑える杭頭荷重調節部材を用いることで、既存杭や基礎スラブの支持能力に応じた荷重を負担させることができる。これにより、基礎スラブに過大な応力を生じさせることなく、性能に応じて適切に既存杭を再利用することが可能になる。   In the foundation structure using the existing pile of the present invention, by using a pile head load adjusting member that keeps the pile head load of the existing pile below a certain level, the load corresponding to the support capacity of the existing pile or foundation slab is borne. Can do. Thereby, it becomes possible to reuse the existing pile appropriately according to the performance without causing excessive stress on the foundation slab.

また、既存杭が負担する荷重が明確になるため、新設の基礎構造が負担する荷重を明確にすることができる。   Moreover, since the load which an existing pile bears becomes clear, the load which a newly installed foundation structure bears can be clarified.

さらに、発泡スチロールのように軽量で、圧縮性が大きい部材を杭頭荷重調節部材として用いることにより、対策厚さを薄くすることができるとともにその敷設作業を容易にすることができる。   Further, by using a lightweight and highly compressible member such as polystyrene foam as the pile head load adjusting member, the thickness of the countermeasure can be reduced and the laying operation can be facilitated.

さらに、せん断剛性の小さい部材を杭頭荷重調節部材として用いることにより、新設杭に比べてせん断や曲げ耐力が小さい既存杭の負担荷重を減らすことが可能になる。   Furthermore, by using a member having a small shear rigidity as a pile head load adjusting member, it is possible to reduce the burden load of an existing pile having a smaller shear and bending strength compared to a newly installed pile.

本発明の一実施形態に係る既存杭を利用した基礎構造を示す断面図である。It is sectional drawing which shows the foundation structure using the existing pile which concerns on one Embodiment of this invention. 本発明の一実施形態に係る既存杭を利用した基礎構造の杭頭荷重調節部材を示す断面図である。It is sectional drawing which shows the pile head load adjustment member of the foundation structure using the existing pile which concerns on one Embodiment of this invention. 杭頭荷重調節部材の応力とひずみの関係を示す図である。It is a figure which shows the relationship between the stress and distortion of a pile head load adjustment member. 本発明の一実施形態に係る既存杭を利用した基礎構造を示す断面図であり、既存杭の支持力に余裕がある場合の構造を示す図である。It is sectional drawing which shows the foundation structure using the existing pile which concerns on one Embodiment of this invention, and is a figure which shows a structure in case there is room in the supporting force of the existing pile. 本発明の一実施形態に係る既存杭を利用した基礎構造を示す断面図であり、新設杭と既存杭の相対位置の違いに応じて負担荷重を変える場合の構造を示す図である。It is sectional drawing which shows the foundation structure using the existing pile which concerns on one Embodiment of this invention, and is a figure which shows the structure in the case of changing a burden load according to the difference in the relative position of a newly installed pile and the existing pile. 本発明の一実施形態に係る既存杭を利用した基礎構造を示す断面図であり、既存基礎スラブも再利用する場合の構造を示す図である。It is sectional drawing which shows the foundation structure using the existing pile which concerns on one Embodiment of this invention, and is a figure which shows the structure in the case of reusing the existing foundation slab. 本発明の一実施形態に係る既存杭を利用した基礎構造を示す断面図であり、杭頭荷重調性部材を２層構造にした場合の構造を示す図である。It is sectional drawing which shows the foundation structure using the existing pile which concerns on one Embodiment of this invention, and is a figure which shows the structure at the time of making a pile head load toning member into 2 layer structure. 本発明の一実施形態に係る既存杭を利用した基礎構造を示す断面図であり、水平荷重の分担状況を示す図である。It is sectional drawing which shows the foundation structure using the existing pile which concerns on one Embodiment of this invention, and is a figure which shows the sharing situation of a horizontal load. 本発明の一実施形態に係る既存杭を利用した基礎構造を示す断面図であり、既存杭を引張荷重に抵抗させる場合の構造を示す図である。It is sectional drawing which shows the foundation structure using the existing pile which concerns on one Embodiment of this invention, and is a figure which shows the structure in the case of making an existing pile resist a tensile load.

以下、図１から図９を参照し、本発明の一実施形態に係る既存杭を利用した基礎構造について説明する。なお、本実施形態は、新設建物／構造物を新設杭（もしくは新設の直接基礎）と既存杭とで支持する基礎構造に関するものである。   Hereinafter, a foundation structure using an existing pile according to an embodiment of the present invention will be described with reference to FIGS. 1 to 9. In addition, this embodiment is related with the foundation structure which supports a new building / structure with a new pile (or new direct foundation) and an existing pile.

具体的に、本実施形態の既存杭を利用した基礎構造Ａは、図１及び図２に示すように、既存杭１に対し、新設基礎スラブ２の底から任意の深さｈ分の杭頭部を切除し、杭頭部を切除した既存杭１上に発泡スチロールなどの降伏荷重度σｙが明確で降伏後の剛性が小さい杭頭荷重調節部材３を置き、その上に新設基礎スラブ２を設置あるいは構築して構成されている。 Specifically, as shown in FIGS. 1 and 2, the foundation structure A using the existing pile according to the present embodiment is a pile head of an arbitrary depth h from the bottom of the new foundation slab 2 with respect to the existing pile 1. The pile head load adjustment member 3 with a clear yield load σ y such as foamed polystyrene and small rigidity after the yield is placed on the existing pile 1 where the pile head is cut off, and the newly installed foundation slab 2 is placed on the pile head load adjustment member 3. Installed or constructed.

ここで、既存杭１には降伏荷重（σｙ・Ａ）以上の荷重は作用しないため、その残りの荷重が新設杭に作用する。Ａは既存杭断面積である。 Here, since the load beyond a yield load ((sigma) y * A) does not act on the existing pile 1, the remaining load acts on a new pile. A is an existing pile cross-sectional area.

また、杭頭荷重調節部材３の厚さｈは、杭頭荷重調節部材３の圧縮が大きすぎて荷重調節機能を喪失しない範囲（例えば１０％）に収まるように設定する。   Further, the thickness h of the pile head load adjusting member 3 is set so as to be within a range (for example, 10%) in which the compression of the pile head load adjusting member 3 is too large and the load adjusting function is not lost.

例えば新設建物４の沈下予測量をδｃとすると、杭頭荷重調節部材３の圧縮歪みεを、降伏歪みεｙ（２〜４％）〜約１０％の範囲に収まるように、すなわちｈ＝δｃ／εとなるよう設定する（図３参照）。 For example, if the predicted settlement amount of the new building 4 is δ c , the compressive strain ε of the pile head load adjusting member 3 is set to fall within the range of yield strain ε y (2-4%) to about 10%, that is, h = It sets so that it may become (delta) c / (epsilon) (refer FIG. 3).

杭頭荷重調節部材３の降伏荷重度σｙは、新設基礎スラブ２の耐力と既存杭１の支持力から決定する。既存杭１に支持力の異なる杭がある場合などでは降伏荷重度σｙを杭毎に変えてもよい。 The yield load degree σ y of the pile head load adjusting member 3 is determined from the yield strength of the new foundation slab 2 and the supporting force of the existing pile 1. When there are piles having different supporting forces in the existing pile 1, the yield load degree σ y may be changed for each pile.

また、既存杭１に期待できる支持力が（σｙ・Ａ）に対して余裕がある場合には、図４に示すように、既存杭１の杭頭部にコンクリート等で拡頭する部材（拡頭部材）５を設け、杭頭断面積を見掛けの杭頭断面積Ａ’に広げ、σｙ・Ａ’の荷重が杭頭部に作用するようにしてもよい。 In addition, when the bearing force that can be expected from the existing pile 1 has a margin with respect to (σ y · A), as shown in FIG. 4, a member that expands the head of the existing pile 1 with concrete or the like (head expansion) Member) 5 may be provided, the pile head cross-sectional area may be expanded to an apparent pile head cross-sectional area A ′, and the load of σ y · A ′ may act on the pile head.

一方、前述の通り、同じ仕様の既存杭１でも新設の建物４の柱４ａからの位置により新設基礎スラブ２に与える影響が異なる。   On the other hand, as described above, even in the existing pile 1 having the same specifications, the influence on the new foundation slab 2 is different depending on the position from the pillar 4a of the new building 4.

これに対し、図５に示すように、スラブ２への影響が小さい新設柱４ａ（新設杭６）に近い既存杭１においては、杭頭荷重調節部材３の降伏荷重σｙ や拡頭面積Ａ’を大きくすることにより大きな荷重を負担させることができる。また、影響が大きい遠い既存杭１においては、逆に杭頭荷重調節部材３の降伏荷重σｙや拡頭面積Ａ’を小さくすることでスラブ２への影響を小さく抑えることができる。 On the other hand, as shown in FIG. 5, in the existing pile 1 close to the new pillar 4a (new pile 6) having a small influence on the slab 2, the yield load σ y of the pile head load adjusting member 3 and the head expansion area A ′ A large load can be borne by increasing. Moreover, in the far existing pile 1 with a big influence, the influence on the slab 2 can be restrained small by making the yield load (sigma) y of the pile head load adjustment member 3 and head expansion area A 'conversely small.

次に、既存杭１の上に既存の基礎スラブ７がある場合には、図６に示すように、既存基礎スラブ７の上に杭頭荷重調節部材３を敷き詰め、その上に新設基礎スラブ２を設け、既存基礎スラブ７も再利用するようにしてもよい。   Next, when there is an existing foundation slab 7 on the existing pile 1, as shown in FIG. 6, the pile head load adjusting member 3 is laid on the existing foundation slab 7, and the new foundation slab 2 is placed thereon. And the existing basic slab 7 may be reused.

この場合は、既存基礎スラブ７と既存杭１で新設建物４の荷重のσｙ・ＡＳを支持し、その他の荷重を新設杭６で支持するようにすればよい。なお、ＡＳは既存基礎スラブ７に敷いた杭頭荷重調節部材３の面積である。 In this case, it supports the σ y · A S of the load of the new building 4 with the existing foundation slab 7 in existing pile 1, it is sufficient to support the other load in new pile 6. Incidentally, A S is the area of the pile head load adjusting member 3 laid on the existing foundation slab 7.

次に、杭頭荷重調節部材３のリラクゼーションによる負担荷重減の影響を低減したい場合には、図７に示すように、降伏荷重が小さい部材３ａ（設計荷重で降伏）と大きい部材３ｂの２層構造（多層構造）で杭頭荷重調節部材３を構成すればよい。   Next, when it is desired to reduce the effect of reducing the burden load due to the relaxation of the pile head load adjusting member 3, as shown in FIG. 7, two layers of a member 3a having a small yield load (yield by design load) and a member 3b having a large yield load are provided. What is necessary is just to comprise the pile head load adjustment member 3 by a structure (multilayer structure).

このとき、設計荷重では部材３ｂが弾性範囲にある。建物沈下には部材３ａの弾塑性変形量と部材３ｂの弾性変形量で対応する。部材３ｂは弾性範囲であるためリラクゼーションが小さい。部材３ａは部材３ａのみ用いた場合と比較して部材３ｂの弾性変形量分だけ厚さを薄くできるので、リラクゼーションの影響を小さく抑えることができる。   At this time, the member 3b is in the elastic range at the design load. The building settlement corresponds to the elastic-plastic deformation amount of the member 3a and the elastic deformation amount of the member 3b. Since the member 3b is in the elastic range, the relaxation is small. Since the thickness of the member 3a can be reduced by the amount of elastic deformation of the member 3b as compared with the case where only the member 3a is used, the influence of relaxation can be suppressed small.

さらにリラクゼーションを抑えたい場合には、杭頭荷重調節部材３の厚さｈを大きくして、新設建物（新設構造物）４の沈下量が杭頭荷重調節部材３の弾性変形量内に収まるようにすればよい。言い換えれば、新設建物の沈下を考慮して杭頭荷重調節部材３の弾性（弾性係数、弾性域）と厚さを設定することで、リラクゼーションを確実に抑えるように構成することが可能になる。   When further relaxation is desired, the thickness h of the pile head load adjustment member 3 is increased so that the amount of settlement of the new building (new structure) 4 falls within the elastic deformation amount of the pile head load adjustment member 3. You can do it. In other words, by setting the elasticity (elastic coefficient, elastic region) and thickness of the pile head load adjusting member 3 in consideration of the settlement of the new building, it is possible to reliably reduce relaxation.

ここで、新設建物４に水平力が作用する場合で、且つ既存杭１の水平耐力が新設杭６に比べて小さい場合であっても、杭頭荷重調節部材３のせん断剛性が新設杭（コンクリート）６よりも小さいことにより、その分、既存杭１の負担水平力を小さくでき、安全を確保することが可能である（図８参照）。   Here, even when the horizontal force acts on the new building 4 and the horizontal proof stress of the existing pile 1 is smaller than that of the new pile 6, the shear rigidity of the pile head load adjusting member 3 is the new pile (concrete ) By being smaller than 6, the load horizontal force of the existing pile 1 can be reduced accordingly, and safety can be ensured (see FIG. 8).

また、杭頭荷重調節部材３と既存マットスラブの間に摩擦係数が小さいシート等の部材を配設すれば、さらに既存杭１の負担水平荷重を小さくすることが可能である。   Moreover, if a member such as a sheet having a small friction coefficient is disposed between the pile head load adjusting member 3 and the existing mat slab, the horizontal load applied to the existing pile 1 can be further reduced.

既存杭１を引張荷重に抵抗させたい場合には、図９に示すように杭頭荷重調節部材３を介して杭頭鉄筋９を新設基礎スラブ２に接続すればよい。この場合には、圧縮荷重は杭頭荷重調節部材３の降伏荷重までしか伝達しないが、引抜荷重は既存杭１の引抜抵抗まで期待することができる。   When it is desired to resist the existing pile 1 against the tensile load, the pile head rebar 9 may be connected to the newly installed foundation slab 2 via the pile head load adjusting member 3 as shown in FIG. In this case, the compressive load is transmitted only up to the yield load of the pile head load adjusting member 3, but the pullout load can be expected to the pullout resistance of the existing pile 1.

したがって、本実施形態の既存杭を利用した基礎構造Ａにおいては、既存杭１の杭頭荷重を一定以下に抑える杭頭荷重調節部材３を用いることで、既存杭１や基礎スラブ２の支持能力に応じた荷重を負担させることができる。これにより、基礎スラブ２に過大な応力を生じさせることなく、性能に応じて適切に既存杭１を再利用することが可能になる。   Therefore, in the foundation structure A using the existing pile of the present embodiment, the support capacity of the existing pile 1 and the foundation slab 2 is obtained by using the pile head load adjusting member 3 that keeps the pile head load of the existing pile 1 below a certain level. The load according to can be borne. Thereby, it becomes possible to reuse the existing pile 1 appropriately according to the performance without causing excessive stress on the foundation slab 2.

また、既存杭１が負担する荷重が明確になるため、新設の基礎構造が負担する荷重を明確にすることができる。   Moreover, since the load which the existing pile 1 bears becomes clear, the load which a newly installed foundation structure bears can be clarified.

さらに、発泡スチロールのように軽量で、圧縮性が大きい部材を杭頭荷重調節部材３として用いることにより、対策厚さを薄くすることができるとともにその敷設作業を容易にすることができる。   Furthermore, by using a lightweight and highly compressible member such as polystyrene foam as the pile head load adjusting member 3, the thickness of the countermeasure can be reduced and the laying operation can be facilitated.

さらに、せん断剛性の小さい部材を杭頭荷重調節部材３として用いることにより、新設杭６に比べてせん断や曲げ耐力が小さい既存杭１の負担荷重を減らすことが可能になる。   Furthermore, by using a member having a small shear rigidity as the pile head load adjusting member 3, it is possible to reduce the burden load of the existing pile 1 having a smaller shear and bending strength compared to the newly installed pile 6.

以上、本発明に係る既存杭を利用した基礎構造の一実施形態について説明したが、本発明は上記の実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。   As mentioned above, although one Embodiment of the foundation structure using the existing pile concerning this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.

１ 既存杭
２ 新設基礎スラブ
３ 杭頭荷重調節部材
４ 新設建物
４ａ 柱
５ 拡頭部材
６ 新設杭
７ 既存の基礎スラブ
９ 杭頭鉄筋
Ａ 既存杭を利用した基礎構造 DESCRIPTION OF SYMBOLS 1 Existing pile 2 New foundation slab 3 Pile head load adjustment member 4 New building 4a Column 5 Expansion member 6 New pile 7 Existing foundation slab 9 Pile head reinforcement A Foundation structure using existing pile

Claims (5)

既存杭と新設基礎スラブの間、もしくは既存杭及び既存基礎スラブと新設基礎スラブの間に、前記新設基礎スラブの耐力と前記既存杭の支持力から決まる所定の降伏荷重度を備えて形成され、前記既存杭に作用する荷重を調節する杭頭荷重調節部材を設けて構成されていることを特徴とする既存杭を利用した基礎構造。   Between the existing pile and the new foundation slab, or between the existing pile and the existing foundation slab and the new foundation slab, formed with a predetermined yield load determined by the proof strength of the new foundation slab and the support force of the existing pile, The foundation structure using the existing pile characterized by providing the pile head load adjustment member which adjusts the load which acts on the said existing pile. 請求項１記載の既存杭を利用した基礎構造において、
前記既存杭の杭頭部に、見掛けの杭頭断面積を大にする拡頭部材が設けられていることを特徴とする既存杭を利用した基礎構造。 In the foundation structure using the existing pile according to claim 1,
A foundation structure using an existing pile, wherein the pile head of the existing pile is provided with a head expansion member that increases the apparent cross-sectional area of the pile head. 請求項１または請求項２に記載の既存杭を利用した基礎構造において、
前記杭頭荷重調節部材が、降伏荷重が異なる複数の部材を一体にして構成されていることを特徴とする既存杭を利用した基礎構造。 In the foundation structure using the existing pile according to claim 1 or claim 2,
A foundation structure using an existing pile, wherein the pile head load adjusting member is formed by integrating a plurality of members having different yield loads. 請求項１から請求項３のいずれか一項に記載の既存杭を利用した基礎構造において、
前記既設杭の杭頭部から突出させた杭頭鉄筋を、前記杭頭荷重調節部材を介して前記新設基礎スラブに接続して構成されていることを特徴とする既存杭を利用した基礎構造。 In the foundation structure using the existing pile according to any one of claims 1 to 3,
The foundation structure using the existing pile characterized by connecting the pile head reinforcement protruded from the pile head of the said existing pile to the said new foundation slab via the said pile head load adjustment member. 請求項１から請求項４のいずれか一項に記載の既存杭を利用した基礎構造において、
新設構造物の沈下を考慮して前記杭頭荷重調節部材の弾性と厚さが設定されていることを特徴とする既存杭を利用した基礎構造。 In the foundation structure using the existing pile according to any one of claims 1 to 4,
A foundation structure using an existing pile, wherein elasticity and thickness of the pile head load adjusting member are set in consideration of settlement of a new structure.
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