JP4344733B2 - Seismic reinforcement structure for existing pile foundation structures - Google Patents

Seismic reinforcement structure for existing pile foundation structures Download PDF

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JP4344733B2
JP4344733B2 JP2006059054A JP2006059054A JP4344733B2 JP 4344733 B2 JP4344733 B2 JP 4344733B2 JP 2006059054 A JP2006059054 A JP 2006059054A JP 2006059054 A JP2006059054 A JP 2006059054A JP 4344733 B2 JP4344733 B2 JP 4344733B2
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謹治 竹内
春行 山本
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本発明は、構造物、基礎及び杭地業からなる既設杭基礎構造物の耐震補強構造に関するものである。 The present invention relates to a seismic reinforcement structure for an existing pile foundation structure composed of a structure, a foundation and a pile land industry.

昭和５６年（１９８１年）以前の、いわゆる旧耐震設計基準に基づく杭基礎構造物においては、水平力が考慮されずに設計されたものが多く、大多数のものに対して耐震補強が必要となっている。   Pile foundation structures based on the so-called old seismic design standards before 1981 (1981) are often designed without considering the horizontal force, and seismic reinforcement is required for the majority. It has become.

従来の既設杭基礎構造物の耐震補強構造として、既存建築物の周囲の地盤に地中連続壁を配設し、前記既存建築物の基礎と前記地中連続壁との間の地盤に地盤改良を施し、前記既存建築物及び地中連続壁と一体となった地盤改良部を形成してなるもの（特許文献１参照）、既設杭基礎構造物の周囲の地盤を締切壁で包囲し、前記杭基礎構造物の基礎と前記締切壁の上部間を固化材で閉鎖するもの（特許文献２参照）、既設杭基礎構造物の周囲に連続地中壁を構築し、該地中壁と前記杭基礎構造物の基礎梁とをスラブ及び／又は繋ぎ梁で連結するもの（特許文献３参照）等がある。 As seismic reinforcement structure of a conventional existing pile foundation structure, disposed underground continuous wall in the ground around the existing buildings, soil improvement to soil between the foundation and the underground continuous wall of the existing building And forming the ground improvement part integrated with the existing building and the underground continuous wall (see Patent Document 1), surrounding the ground around the existing pile foundation structure with a cutoff wall, What closes between the foundation of a pile foundation structure and the upper part of the said cut-off wall with a solidification material (refer patent document 2), constructs a continuous underground wall around the existing pile foundation structure, and this underground wall and said pile There are some which connect a foundation beam of a foundation structure with a slab and / or a connecting beam (see Patent Document 3).

特開平９−２２８３９０号公報（図１−２）JP-A-9-228390 (FIG. 1-2) 特開平１０−１８３１０号公報（図１−３）Japanese Patent Laid-Open No. 10-18310 (FIGS. 1-3) 特公平６−３０２９号公報（第１−２図）Japanese Examined Patent Publication No. 6-3029 (Fig. 1-2)

以上のような従来の既設杭基礎構造物の耐震補強構造においては、既設杭基礎構造物の周囲の地盤の比較的深い位置まで土留壁（地中連続壁、締切壁、連続地中壁）を設ける必要があるとともに、該土留壁は鉄筋コンクリートで形成するのが一般的である。したがって、土留壁の完成形状よりも大きなスペースを既設杭基礎構造物の周囲にわたって比較的深い位置まで掘削する必要があり、排土量が多くなるため、該掘削に時間と費用がかかるという問題点がある。また、既設杭基礎構造物の周囲にわたって型枠入れ、鉄筋組立、コンクリート打設、型枠脱型及び埋め戻し等の施工をする必要があるため、該施工に時間と費用がかかるという問題点がある。また、既設杭基礎構造物の周辺を深く掘削・埋め戻しするので、周辺地盤を緩めることになるという問題点もある。 In the conventional seismic reinforcement structure of existing pile foundations as described above, retaining walls (continuous underground walls, cut-off walls, continuous underground walls) are installed to a relatively deep position around the existing pile foundation structures. In general, the retaining wall is formed of reinforced concrete. Therefore, it is necessary to excavate a space larger than the completed shape of the retaining wall to a relatively deep position over the circumference of the existing pile foundation structure. There is. In addition, there is a problem that it takes time and cost because it is necessary to perform formwork placement, rebar assembly, concrete placement, formwork demolding and backfilling around the existing pile foundation structure. is there. Another problem is that the surrounding ground will be loosened because the surrounding area of the existing pile foundation is deeply excavated and backfilled.

さらに、特許文献１のように前記既存建築物の基礎と前記土留壁（地中連続壁）との間の地盤全体を地盤改良して地盤改良部を設ける構成では、該地盤改良部の排土量が多くなるため該地盤改良部の施工に時間と費用がかかること、並びに、前記基礎、土留壁及び地盤改良部が一体化しにくいこと等の問題点もある。   Furthermore, in the configuration in which the entire ground between the foundation of the existing building and the retaining wall (underground continuous wall) is improved and a ground improvement portion is provided as in Patent Document 1, soil removal of the ground improvement portion is performed. Since the amount increases, there are also problems such as that it takes time and cost to construct the ground improvement part, and that the foundation, the retaining wall and the ground improvement part are difficult to be integrated.

さらにまた、特許文献２のように前記杭基礎構造物の基礎と前記土留壁（締切壁）の上部間を固化材で閉鎖する構成では、該固化材を充填するスペースの排土量が多くなるため該固化材の施工に時間と費用がかかること等の問題点もある。   Furthermore, in the configuration in which the space between the foundation of the pile foundation structure and the upper part of the retaining wall (cutting wall) is closed with a solidifying material as in Patent Document 2, the amount of soil discharged in the space filled with the solidifying material increases. Therefore, there is a problem that it takes time and cost to construct the solidified material.

また、特許文献３のように前記杭基礎構造物の基礎梁と前記土留壁（連続地中壁）とをスラブ及び／又は繋ぎ梁で連結する構成では、該スラブ及び／又は繋ぎ梁の施工に時間と費用がかかること等の問題点もある。   Moreover, in the structure which connects the foundation beam of the said pile foundation structure and the said earth retaining wall (continuous underground wall) with a slab and / or a connecting beam like patent document 3, for construction of this slab and / or a connecting beam There are also problems such as time and cost.

本発明は、このような課題を解決するためになされたものであり、強固な耐震補強を可能としながら施工の容易化及びコスト低減化を図ることができる既設杭基礎構造物の耐震補強構造を得ることを目的とする。 The present invention has been made to solve such a problem, and provides an earthquake-proof reinforcement structure for an existing pile foundation structure capable of facilitating construction and reducing costs while enabling strong earthquake-proof reinforcement. The purpose is to obtain.

本発明に係る既設杭基礎構造物の耐震補強構造は、前記課題解決のために、構造物、基礎及び杭地業からなる既設杭基礎構造物において、前記基礎の周囲を取り囲む、鋤取りにより掘削した地盤の表層部の土に固化材を添加混合したものを埋め戻して敷き均し、締め固めてなる、地盤改良体を、基礎フーチングから外方向に離間させて配設し、前記地盤改良体と前記基礎フーチングとを強固に連結する複数の連結部材を、前記基礎の周方向に離間させて横設してなるものである。

The seismic reinforcement structure for an existing pile foundation structure according to the present invention is excavated by dredging to surround the foundation in an existing pile foundation structure composed of a structure, a foundation and a pile ground industry in order to solve the above problems. The ground improvement body, which is obtained by backfilling and laying and adding the solidified material added to the soil of the surface layer portion of the ground, and then compacting, is arranged away from the foundation footing in the outward direction. And a plurality of connecting members that firmly connect the foundation footing to each other in the circumferential direction of the foundation.

ここで、前記連結部材が鉄筋コンクリートであり、該鉄筋コンクリートの内側端を前記基礎フーチングに固定するとともに、前記鉄筋コンクリートの外側部分を前記地盤改良体中に埋没させてなると好ましい。   Here, it is preferable that the connecting member is reinforced concrete, the inner end of the reinforced concrete is fixed to the foundation footing, and the outer portion of the reinforced concrete is buried in the ground improvement body.

また、前記連結部材が単又は複数の型鋼、鋼板若しくは鋼管からなる鋼材であり、該鋼材の内側端を前記基礎フーチングに固定するとともに、前記鋼材の外側部分を前記地盤改良体中に埋没させてなると好ましい。   Further, the connecting member is a steel material made of one or a plurality of steel shapes, steel plates or steel pipes, and the inner end of the steel material is fixed to the basic footing, and the outer portion of the steel material is buried in the ground improvement body. This is preferable.

本発明に係る既設杭基礎構造物の耐震補強構造は、構造物、基礎及び杭地業からなる杭基礎構造物において、前記基礎の周囲を取り囲む、鋤取りにより掘削した地盤の表層部の土に固化材を添加混合したものを埋め戻して敷き均し、締め固めてなる、地盤改良体を、基礎フーチングから外方向に離間させて配設し、前記地盤改良体と前記基礎フーチングとを強固に連結する複数の連結部材を、前記基礎の周方向に離間させて横設してなるので、既設杭基礎構造物の周囲の地盤の比較的深い位置まで土留壁を設ける必要がない簡素な構成により、前記地盤改良体、連結部材及び基礎フーチングが強固に連結されて一体化され、地震力等の水平力が地盤改良体により負担されるため、強固な耐震補強を可能としながら施工の容易化及びコスト低減化を図ることができる。
The seismic reinforcement structure for an existing pile foundation structure according to the present invention is a pile foundation structure composed of a structure, a foundation and a pile ground industry, which surrounds the foundation and surrounds the soil of the surface layer of the ground excavated by dredging. A ground improvement body, which is backfilled with a mixture of added solidification material, leveled, and compacted, is disposed away from the foundation footing in an outward direction, and the ground improvement body and the foundation footing are firmly attached. Since a plurality of connecting members to be connected are laterally spaced apart from each other in the circumferential direction of the foundation, a simple configuration that does not require a retaining wall to a relatively deep position around the existing pile foundation structure is provided. The ground improvement body, the connecting member, and the foundation footing are firmly connected and integrated, and horizontal force such as seismic force is borne by the ground improvement body, so that the construction can be facilitated while enabling strong seismic reinforcement and Cost reduction It can be achieved.

また、前記連結部材が鉄筋コンクリートであり、該鉄筋コンクリートの内側端を前記基礎フーチングに固定するとともに、前記鉄筋コンクリートの外側部分を前記地盤改良体中に埋没させてなると、前記連結部材である鉄筋コンクリートは前記地盤改良体と嵌合して強固に連結されて一体化するため、さらに強固な耐震補強が可能となる。
Further, when the connecting member is reinforced concrete, the inner end of the reinforced concrete is fixed to the foundation footing, and the outer part of the reinforced concrete is buried in the ground improvement body , the reinforced concrete as the connecting member becomes the ground. order to integrally rigidly connected mates with improved body, it is possible to more robust seismic reinforcement.

さらに、前記連結部材が単又は複数の型鋼、鋼板若しくは鋼管からなる鋼材であり、該鋼材の内側端を前記基礎フーチングに固定するとともに、前記鋼材の外側部分を前記地盤改良体中に埋没させてなると、前記連結部材である鋼材は前記地盤改良体と嵌合して強固に連結されて一体化するため、さらに強固な耐震補強が可能となる。その上、前記連結部材が鋼材からなるため、該連結部材の施工を容易に行うことができる。

Further, the connecting member is a steel material made of one or a plurality of steel shapes, steel plates, or steel pipes, and the inner end of the steel material is fixed to the basic footing, and the outer portion of the steel material is buried in the ground improvement body. comes to, steel is the connecting member order to integrally rigidly coupled engaged with the soil improvement material, it is possible to more robust seismic reinforcement. In addition, since the connecting member is made of a steel material, the connecting member can be easily constructed.

以下において、本発明を具体化した実施の形態を添付図面に基づき詳細に説明するが、本発明は、添付図面に示された形態に限定されず、特許請求の範囲に記載された要件を満たす実施形態の全てを含むものである。なお、添付図面においては、説明の簡略化のために構造物の上部構造を省略している。   In the following, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and satisfies the requirements described in the claims. All of the embodiments are included. In the accompanying drawings, the upper structure of the structure is omitted for simplification of description.

図１は本発明の実施の形態に係る既設杭基礎構造物の耐震補強構造を示す平面図である。図において、既設杭基礎構造物の基礎１１の周囲を取り囲む、地盤Ｇの表層部を改良してなる地盤改良体１が、地中はり１３を支持する基礎フーチング１２，…から外方向に離間させて配設され、地盤改良体１と基礎フーチング１２，…とを連結する複数の連結部材２，…が、基礎１１の周方向に離間させて横設され、基礎１１、連結部材２，…及び地盤改良体１が一体化される。なお、地盤改良体１の幅は１ｍ〜２ｍ程度、地盤改良体１の深さは２ｍ〜４ｍ程度とすればよい。また、地盤改良体１の平面形状は、図１に示すような矩形に限定されるものではなく、既設杭基礎構造物の平面形状に合わせた適宜の形状を選択することができる。 FIG. 1 is a plan view showing a seismic reinforcement structure for an existing pile foundation structure according to an embodiment of the present invention. In the figure, the ground improvement body 1 which improves the surface layer part of the ground G surrounding the periphery of the foundation 11 of the existing pile foundation structure is spaced outward from the foundation footings 12 supporting the underground beam 13. A plurality of connecting members 2,... For connecting the ground improvement body 1 and the foundation footing 12,... Are spaced apart in the circumferential direction of the foundation 11, and the foundation 11, the connecting members 2,. The ground improvement body 1 is integrated. The width of the ground improvement body 1 may be about 1 m to 2 m, and the depth of the ground improvement body 1 may be about 2 m to 4 m. Moreover, the planar shape of the ground improvement body 1 is not limited to a rectangle as shown in FIG. 1, The suitable shape according to the planar shape of the existing pile foundation structure can be selected.

図２〜図６は本発明の実施の形態に係る既設杭基礎構造物の耐震補強構造を構築する工法を示す部分縦断面図であり、図２は地盤改良体用及び連結部材用の掘削を行った状態を、図３は下部地盤改良体を形成した状態を、図４は連結部材を基礎フーチングに固定した状態を、図５は上部地盤改良体を形成した状態を、図６は図１に相当する完成状態を示している。また、図７はホールインアンカーを基礎フーチングに打ち込んで配筋をした状態を示す部分拡大斜視図であり、図８は同じく平面図である。なお、図７及び図８において型枠は省略している。 2 to 6 are partial longitudinal sectional views showing a construction method for constructing a seismic reinforcement structure for an existing pile foundation structure according to an embodiment of the present invention, and FIG. 2 shows excavation for ground improvement bodies and connection members. 3 shows a state where the lower ground improvement body is formed, FIG. 4 shows a state where the connecting member is fixed to the foundation footing, FIG. 5 shows a state where the upper ground improvement body is formed, and FIG. The completed state is shown. FIG. 7 is a partially enlarged perspective view showing a state where the hole-in anchor is driven into the basic footing and the reinforcement is arranged, and FIG. 8 is also a plan view. In addition, the formwork is abbreviate | omitted in FIG.7 and FIG.8.

杭地業２１は、例えば杭２２，…、割栗石２３及び捨てコンクリート２４からなり、杭２２，…を打った後、割栗石２３を敷設し転圧にて地盤を強化し、捨てコンクリート２４を打設して構築される。捨てコンクリート２４，…上には基礎フーチング１２，…が設けられ、該基礎フーチング１２，…が地中はり１３を支持している。本実施の形態では、構造物を支持する基礎１１が多数の独立した基礎フーチング１２，…等からなるが、基礎フーチングはこのような独立したものではなく連続したものであってもよい。   The pile land industry 21 is composed of, for example, piles 22,..., Split stones 23 and discarded concrete 24. After hitting the piles 22,... Constructed by casting. .. Are disposed on the discarded concrete 24,..., And the foundation footing 12,. In the present embodiment, the foundation 11 that supports the structure includes a large number of independent foundation footings 12,..., But the foundation footing may be continuous rather than independent.

本発明に係る既設杭基礎構造物の耐震補強を行うために、先ず、図２に示すように、地盤Ｇの地表面ＧＬから下の表層部において、地盤改良体用掘削箇所Ｄ１及び連結部材用掘削箇所Ｄ２の掘削を、例えばバックホウによる鋤取りにより行う（該掘削箇所Ｄ１及びＤ２の平面位置は図８参照）。
In order to perform seismic reinforcement of the existing pile foundation structure according to the present invention, first, as shown in FIG. 2, in the surface layer portion below the ground surface GL of the ground G, the ground improvement body excavation point D1 and the connection member drilling drilling locations D2, for example, performed by a plow-up by the backhoe (planar position of該掘cutting portions D1 and D2 refer to FIG. 8).

すなわち、地盤改良体用掘削箇所Ｄ１は、基礎フーチング１２，…から外方向に離間し、基礎１１の周囲を取り囲む位置であり、基礎フーチング１２，…の下面よりも深く掘削される（底面位置Ｌ参照）。また、連結部材用掘削箇所Ｄ２，…は、地盤改良体１と基礎フーチング１２，…とを連結する各連結部材２，…を設けるための空間を確保することができればよいので、平面位置においては、基礎フーチング１２，…と地盤改良体１との間を全て掘削せずに、図７及び図８に示すように各連結部材２，…の近傍のみを、深さ位置においては例えば基礎フーチング１２，…の下面位置程度の深さまで掘削される（底面位置Ｈ参照）。   That is, the ground improvement body excavation point D1 is a position that is spaced outward from the foundation footing 12,... And surrounds the periphery of the foundation 11, and is excavated deeper than the lower surface of the foundation footing 12,. reference). Moreover, since the excavation location D2, ... for a connection member should just ensure the space for providing each connection member 2, ... which connects the ground improvement body 1 and the foundation footing 12, ..., in a planar position, .., And the ground improvement body 1 are not excavated all, but only the vicinity of each connecting member 2, as shown in FIGS. 7 and 8, in the depth position, for example, the foundation footing 12. , ... are excavated to a depth of about the lower surface position (see bottom surface position H).

以上のような地盤改良体用掘削箇所Ｄ１及び連結部材用掘削箇所Ｄ２の掘削は、特許文献１ないし３における場合のような、既設杭基礎構造物の周囲の地盤の比較的深い位置まで土留壁を設けるために行う掘削及び土留壁と基礎との間の地盤改良部等のための掘削と比較して排土量を少なくすることができるため、該掘削にかかる時間と費用を削減することができる。 The excavation of the ground improvement body excavation point D1 and the connection member excavation point D2 as described above is carried out to a relatively deep position of the ground around the existing pile foundation structure as in Patent Documents 1 to 3. Compared to excavation to provide a pit and excavation for the ground improvement part between the retaining wall and the foundation, the amount of soil discharged can be reduced, so that the time and cost for the excavation can be reduced. it can.

次に、図３に示すように、下部地盤改良体１Ａを、前記のとおり掘削した土に、二酸化けい素、酸化アルミニウム、酸化カルシウム及び三酸化イオウ等の成分からなるセメント系固化材等の固化材を添加混合して埋め戻して敷き均し、重機及びローラー等により締め固めることにより、その上面位置が連結部材用掘削箇所Ｄ２の底面の高さ位置Ｈと略同一となるように、容易に形成することができる（図７も参照）。   Next, as shown in FIG. 3, solidification of cement-based solidified material or the like composed of components such as silicon dioxide, aluminum oxide, calcium oxide and sulfur trioxide on the soil excavated from the lower ground improvement body 1A as described above. By adding and mixing materials, backfilling and leveling, and compacting with heavy machinery and rollers, etc., the top surface position can be easily set to be substantially the same as the height position H of the bottom surface of the connecting member excavation point D2. Can also be formed (see also FIG. 7).

次に、図４及び図７に示すように、基礎フーチング１２，…の外側面にホールインアンカー４，…を打ち込み、型枠を入れ、鉄筋５，…を組み立てて下部地盤改良体１Ａの上側まで配設し、コンクリート６，…を打設した後に型枠を脱型することにより前記連結部材２，…となる鉄筋コンクリート３，…を形成する。なお、前記型枠は脱型せずに地中に残したままとしてもよい。また、ホールインアンカー４，…に代えて差筋等を用いてもよい。このようにして、連結部材２，…（鉄筋コンクリート３，…）の内側端が基礎フーチング１２，…に固定されて、連結部材２，…と基礎フーチング１２，…が一体化される。そして、連結部材２，…は、基礎１１の周方向に離間した状態で各々水平方向に延び、その外側部分が下部地盤改良体１Ａの上側に載置される。   Next, as shown in FIGS. 4 and 7, hole-in anchors 4, ... are driven into the outer surface of the foundation footings 12, ..., a formwork is inserted, rebars 5, ... are assembled, and the upper side of the lower ground improvement body 1A is assembled. , And after placing the concrete 6,..., The mold is removed to form the reinforced concrete 3,. The formwork may be left in the ground without being removed. Further, a differential line or the like may be used instead of the hole-in anchors 4. In this way, the inner ends of the connecting members 2,... (Reinforced concrete 3,...) Are fixed to the foundation footings 12,... And the connecting members 2,. And the connection members 2, ... are each extended in the horizontal direction in a state of being spaced apart in the circumferential direction of the foundation 11, and the outer portions thereof are placed on the upper side of the lower ground improvement body 1A.

次に、図５に示すように、下部地盤改良体１Ａの上側に上部地盤改良体１Ｂを、前記のとおり掘削した土に、前記固化材を添加混合して埋め戻して敷き均し、重機及びローラー等により締め固めることにより、その上面位置が地表面ＧＬとなるように形成する。このようにして、連結部材２，…（鉄筋コンクリート３，…）の外側部分が地盤改良体１中に埋没され、連結部材２，…は地盤改良体１と嵌合して強固に連結されて一体化する。   Next, as shown in FIG. 5, the upper ground improvement body 1B is placed on the upper side of the lower ground improvement body 1A, the solidified material is added and mixed in the soil excavated as described above, backfilled, leveled, By compacting with a roller or the like, the upper surface position is formed to be the ground surface GL. In this way, the outer portions of the connecting members 2,... (Reinforced concrete 3,...) Are buried in the ground improvement body 1, and the connecting members 2,. Turn into.

次に、図６に示すように、連結部材用掘削箇所Ｄ２，…に土７を上面位置が地表面ＧＬとなるように埋め戻すことにより、本実施の形態に係る耐震補強の施工が完成する。   Next, as shown in FIG. 6, the construction of the seismic reinforcement according to the present embodiment is completed by backfilling the soil 7 in the excavation points D2, ... for the connecting member so that the upper surface position is the ground surface GL. .

以上のような構成の既設杭基礎構造物の耐震補強構造によれば、土留壁を設ける必要がない簡素な構成により、地盤改良体１、連結部材２，…及び基礎フーチング１２，…が強固に連結されて一体化され、地震力等の水平力が地盤改良体１により負担されるため、強固な耐震補強が可能となるとともに施工の容易化及びコスト低減化を図ることができる。 According to the seismic reinforcement structure of the existing pile foundation structure having the above configuration, the ground improvement body 1, the connecting members 2,... And the foundation footing 12,. Since they are connected and integrated and a horizontal force such as seismic force is borne by the ground improvement body 1, strong seismic reinforcement can be achieved and construction can be facilitated and costs can be reduced.

以上の説明においては、連結部材２，…が鉄筋コンクリート３，…である場合を示したたが、連結部材２，…は鉄筋コンクリート３，…に限定されるものではない。例えば、連結部材２，…として、単又は複数の型鋼、鋼板若しくは鋼管からなる鋼材を用い、該鋼材の内側端を基礎フーチング１２，…に固定するとともに、前記鋼材の外側部分を地盤改良体１中に埋没させるようにしてもよい。このように連結部材２，…として鋼材を用いる構成とすると、前記のとおりの強固な耐震補強を可能としながら、さらに施工の容易化及びコスト低減化を図ることができる。   In the above description, the connecting members 2,... Are reinforced concrete 3,..., But the connecting members 2,. For example, as the connecting members 2,..., A steel material made of a single or a plurality of mold steels, steel plates, or steel pipes is used, and the inner ends of the steel materials are fixed to the foundation footings 12,. You may make it bury in. Thus, when it is set as the structure which uses steel materials as the connection members 2, ..., the construction can be further facilitated and the cost can be reduced while enabling the strong earthquake-proof reinforcement as described above.

また、以上の説明においては、図１に示すように最外側の基礎フーチング１２，…の全てと地盤改良体１とを、基礎１１の周方向に離間させて横設された複数の連結部材２，…により連結する場合を示したが、最外側の基礎フーチング１２，…の一部と地盤改良体１とを連結部材２，…により連結してもよい。   Moreover, in the above description, as shown in FIG. 1, a plurality of connecting members 2 that are laterally provided with all of the outermost foundation footings 12,... And the ground improvement body 1 spaced apart in the circumferential direction of the foundation 11. However, a part of the outermost basic footings 12,... And the ground improvement body 1 may be connected by connecting members 2,.

本発明の実施の形態に係る既設杭基礎構造物の耐震補強構造を示す平面図である。It is a top view which shows the earthquake-proof reinforcement structure of the existing pile foundation structure which concerns on embodiment of this invention. 本発明の実施の形態に係る既設杭基礎構造物の耐震補強構造を構築する工法を示す部分縦断面図であり、地盤改良体用及び連結部材用の掘削を行った状態を示している。It is a fragmentary longitudinal cross-sectional view which shows the construction method which constructs the earthquake-proof reinforcement structure of the existing pile foundation structure which concerns on embodiment of this invention, and has shown the state which excavated for the ground improvement body and the connection member. 同じく部分縦断面図であり、下部地盤改良体を形成した状態を示している。It is a partial longitudinal cross-sectional view similarly, and has shown the state which formed the lower ground improvement body. 同じく部分縦断面図であり、連結部材を基礎フーチングに固定した状態を示している。It is a fragmentary longitudinal cross-sectional view similarly, and has shown the state which fixed the connection member to the foundation footing. 同じく部分縦断面図であり、上部地盤改良体を形成した状態を示している。It is a fragmentary longitudinal cross-sectional view similarly, and has shown the state which formed the upper ground improvement body. 同じく部分縦断面図であり、完成状態を示している。Similarly, it is a partial longitudinal sectional view, showing a completed state. ホールインアンカーを基礎フーチングに打ち込んで配筋をした状態を示す部分拡大斜視図である。It is a partial expansion perspective view which shows the state which laid the hole-in anchor in the basic footing and arranged the bar. 同じく平面図である。It is also a plan view.

符号の説明Explanation of symbols

１ 地盤改良体
１Ａ 下部地盤改良体
１Ｂ 上部地盤改良体
２ 連結部材
３ 鉄筋コンクリート
４ ホールインアンカー
５ 鉄筋
６ コンクリート
７ 土
１１ 基礎
１２ 基礎フーチング
１３ 地中はり
２１ 杭地業
２２ 杭
２３ 割栗石
２４ 捨てコンクリート
Ｇ 地盤
ＧＬ 地表面
Ｄ１ 地盤改良体用掘削箇所
Ｄ２ 連結部材用掘削箇所
Ｌ 地盤改良体用掘削箇所底面の高さ位置
Ｈ 連結部材用掘削箇所底面の高さ位置
DESCRIPTION OF SYMBOLS 1 Ground improvement body 1A Lower ground improvement body 1B Upper ground improvement body 2 Connecting member 3 Reinforced concrete 4 Hole-in anchor 5 Reinforcement 6 Concrete 7 Soil 11 Foundation 12 Foundation footing 13 Underground beam 21 Pile ground work 22 Pile 23 Cracking stone 24 Abandoned concrete G Ground GL Ground surface D1 Ground improvement body excavation site D2 Connection member excavation site L Ground improvement body excavation site bottom height position H Connection member excavation site bottom surface height position

Claims (3)

構造物、基礎及び杭地業からなる既設杭基礎構造物において、
前記基礎の周囲を取り囲む、鋤取りにより掘削した地盤の表層部の土に固化材を添加混合したものを埋め戻して敷き均し、締め固めてなる、地盤改良体を、基礎フーチングから外方向に離間させて配設し、前記地盤改良体と前記基礎フーチングとを強固に連結する複数の連結部材を、前記基礎の周方向に離間させて横設してなることを特徴とする既設杭基礎構造物の耐震補強構造。 In the existing pile foundation structure consisting of structure, foundation and pile land industry,
The ground improvement body that surrounds the periphery of the foundation, backfilled with a mixture of solidification material added to the soil of the surface layer of the ground excavated by dredging, laid and compacted, outward from the foundation footing An existing pile foundation structure characterized in that a plurality of connecting members that are arranged apart from each other and that firmly connect the ground improvement body and the foundation footing are separated from each other in the circumferential direction of the foundation. Seismic reinforcement structure for objects. 前記連結部材が鉄筋コンクリートであり、該鉄筋コンクリートの内側端を前記基礎フーチングに固定するとともに、前記鉄筋コンクリートの外側部分を前記地盤改良体中に埋没させてなることを特徴とする請求項１記載の既設杭基礎構造物の耐震補強構造。   2. The existing pile according to claim 1, wherein the connecting member is reinforced concrete, the inner end of the reinforced concrete is fixed to the foundation footing, and the outer portion of the reinforced concrete is buried in the ground improvement body. Seismic reinforcement structure for foundation structures. 前記連結部材が単又は複数の型鋼、鋼板若しくは鋼管からなる鋼材であり、該鋼材の内側端を前記基礎フーチングに固定するとともに、前記鋼材の外側部分を前記地盤改良体中に埋没させてなることを特徴とする請求項１記載の既設杭基礎構造物の耐震補強構造。   The connecting member is a steel material made of one or a plurality of steel shapes, steel plates, or steel pipes, and the inner end of the steel material is fixed to the foundation footing, and the outer portion of the steel material is buried in the ground improvement body. The earthquake-proof reinforcement structure of the existing pile foundation structure of Claim 1 characterized by these.
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