JP3701280B2

JP3701280B2 - Yamadome support

Info

Publication number: JP3701280B2
Application number: JP2002365024A
Authority: JP
Inventors: 嘉一西山; 亮木村
Original assignee: 株式会社データ・トゥ
Priority date: 2002-12-17
Filing date: 2002-12-17
Publication date: 2005-09-28
Anticipated expiration: 2022-12-17
Also published as: CN1508362A; KR100715563B1; KR20040053764A; CN100336980C; JP2004197358A

Description

【０００１】
【発明の属する技術分野】
本発明は、水中に於いて構造物を構築する際の鋼管矢板による締切工や掘削山留めを行う場合などに使用する山留支保工に関するものである。
【０００２】
【従来の技術】
締切り工や土止め・山留工に使用される山留支保工としては、下記特許文献１にも記載されているが、図８〜図１０に示すように鋼管矢板１は鋼管２の左右周側に継手３を形成したものであり、この継手３同士を接続することで順次連続させる。なお、この継手３の形状は、ボックス形とＴ字形、Ｃ字形相互、Ｃ字形とＴ字形等組み合わせなど様々であり、図示は一例である。
【０００３】
【特許文献１】
特公平４−６３１６７号公報
【特許文献２】
特開２０００−２２０１３５公報
【０００４】
また、前記鋼管矢板１はディーゼルパイルハンマによる打設（杭打）機で打ち込む場合もあるが、これは打設にともなう騒音振動が大きく建設公害となる。そこで、アースオーガ掘削により嵌入抵抗を低減しながら、油圧ジャッキやバイブロハンマにより圧入する方法も採用されるが、いずれの場合も鋼管２を一本ずつセットしていくものである。
【０００５】
このように１本ずつ鋼管２を掘削孔に挿入したり、打設したりして締切り工が施工するのでは非常に手間がかかるとともに、施工の際に継手３の部分の挿入抵抗が多いので曲がりやすく鋼管矢板１自体の垂直精度の確保が困難である。さらに前記のごとくアースオーガ掘削を先行させて掘削孔内に鋼管矢板１をセットする場合に、このアースオーガに多軸のオーガ機を使用すれば掘削孔については一度に複数のものが同時形成できるが、鋼管矢板１の配置に関しては前記のように１本ずつ行うことを原則としているので、工数の削減にはならない。
【０００６】
また、軟弱地盤の場合は水深１０ｍ、堅固な地盤の場合は水深１５ｍを越えると、該工法による施工が技術的に困難であると言われている。
【０００７】
これに対して、発明者は先に特願２００１−１９８１１２号として、鋼管矢板としては、従来の鋼管矢板よりも強度を増すことになり、その結果、密閉空間が止水効果を発揮し、止水工による水質汚染が縮小され、経済効果も増し環境対策となる鋼管矢板による締切り工を提案した。
【０００８】
これは、図１２に示すように鋼管矢板１は並列させる鋼管２の相互を各鋼管２の周面に端縁が結合するＨ形のつなぎ材（板）としてＨ鋼４でこのＨ鋼４の幅分だけ間隔を存して一体的に連結し、また、かかる相互連結と反対側には継手３を設けるようにした。
【０００９】
このＨ鋼４は形鋼によるものでもまた、適宜溶接により工場等で独自に組み立てたものでもよい。形鋼を利用する場合はフランジ４ａの左右端縁を鋼管周面に溶接することになり、これら平行するフランジ４ａと鋼管２、２とで四方を囲撓した密閉空間５を形成する。図中４ｂはウエブである。
【００１０】
鋼管２、２の前記Ｈ鋼４での相互連結側と反対側には継手３を設けて二連タイプの鋼管矢板１とする。前記継手３は図８〜図１０に示す従来例と同じく種々のタイプが考えられ、特に限定はなく、本実施形態の例は図９と同一で、スリット３ａを有する環体であるＣ字形を横断面とした管体を鋼管２の周面に溶接して取り付けた。継手３は鋼管２の真横に設けるが、このスリット３ａは継手３の真横でなく、斜め方向に開口するもので、継手３が相互に対向する場合はスリット３ａは対象的向きに開口し、スリット３ａを介して継手３が互いにお互いの中に入り込むように噛み合う。
【００１１】
なお、継手３は図示の例に限定されず、他の実施形態として一方の雄部は一枚の片で、これが他方の２枚の間隔を有する２枚の片による雌部に挿入されるような単純形のものでもよい。また、図示は省略するが、並列させたフランジ４ａを湾曲もしくは屈曲させることで鋼管２を角度をもって結合させることもできる。このようにすれば、鋼管矢板１をリングビーム等の円形で小径の円形に接続配置するのに好適なものとなる。なお、鋼管矢板１をリングビーム等の円形で比較的大径の場合は継手３の噛み合わせ角度のみの調整でも可能である。
【００１２】
この特願２００１−１９８１１２号の鋼管矢板によれば、鋼管矢板としては、鋼管とで四方を囲繞した密閉空間を形成する。つまり、鋼管と鋼管をＨ鋼の４点の端部で溶接された形状であり、Ｈ鋼で継ぐ事で複数の鋼管からなる、一体化した鋼管矢板となるので、その分強度を増す事が出来、短軸方向のみならず長軸方向の耐力を受ける事が出来る。従来の両端に継手を持つ鋼管矢板の継手間は、設計上その剛性を考慮しないが、２本の鋼管をＨ鋼で継ぐ事で剛性を十二分に考慮でき、短軸方向の二次モーメントが増える。
【００１３】
従来の施工本数に対して、継手間が単純に半分以下になるため、止水工（モルタル注入や薬注) も半分以下で済み、経済的効果が大きく、又注入量が減ることから水質汚染が減少し、環境にやさしい（環境対策）工事となる。さらに、１本ずつ打設するより、２本同時に打設する方が有利であり、施工時間は大幅に短縮出来、海洋工事等に見られる台船使用期間の大幅な短縮は、経済的に陸上工事に比べて大きな有利となる。しかも、２本が定められた精度で継がれているために、その施工精度も高く、鉛直精度も向上する。
【００１４】
【発明が解決しようとする課題】
ところで、軟弱地盤等で、掘削平面が大きく、例えば一辺が長大になる場合とか、河川、海等に近接した地域、または傾斜地等で片側に土圧を受けるような場合、従来から水平切梁工法、地盤アンカー工法、アイランド工法が用いられている。
【００１５】
従来から用いられている水平切梁工法は、一辺が長大の掘削面積の場合とか、河川、海等に近接した地域又は傾斜地等で片側から土圧を受けるような場合、最早水平切梁によって軸力を支承することが困難となり、軸力のばらつきも多く山留め壁の品質保証が出来なくなる。また、このような条件の下で採用される斜め地盤アンカー工法は、敷地条件に制約を受け採用困難な場合が多い。
【００１６】
そこでこのような場合は、アイランド工法が採用されるが、この工法は分割工事になることから工期が長期にわたり、建設コストも嵩み好まれないのが現状である。
【００１７】
そこで泥水処理が不要で、排出泥土も他の場所打ちＲＣ山留め工法に比べて少なく、工期も短く経済性の高いソイルセメント柱列山留め壁が考えられるが、ソイルセメント柱列山留め壁単独では、土圧に対して自立山留め壁としての強度及び剛性の不足により、安定した山留め壁の品質が期待できない。
【００１８】
また、鋼管矢板井筒基礎工法においては、掘削深度が深く、鋼管矢板に作用する土圧が大きい場合には、井筒内に設置される切梁やそれらを支える支持杭の配置計画は充分な検討が必要とされ、従来は井筒内の鋼管矢板の一部を中間支持杭として利用する等工夫が必要であった。
【００１９】
本発明の目的は前記従来例の不都合を解消し、鋼管矢板としては、従来の鋼管矢板よりも強度を増すことになり、その結果、密閉空間が止水効果を発揮し、止水工による水質汚染が縮小され、経済効果も増し環境対策となるもので、このような鋼管矢板を支保工単位部材として利用し、自立性が極めて高く、その結果として切梁等が省略できる山留支保工を提供することにある。
【００２０】
【課題を解決するための手段】
本発明は前記目的を達成するため、第１に、支保工単位部材としては、並列させた鋼管相互を各鋼管の周面に端縁が結合する横断面形がＨ形のつなぎ材で一体的に連結し、かつ、鋼管に継手を設けた二連タイプの鋼管矢板であり、この支保工単位部材を継手相互の結合で横向きに連結して山留壁を形成する場合に、つなぎ材およびその先の鋼管が山留壁背後に配設されるように縦向きにした支保工単位部材を適宜間隔で介在させること、第２に、縦向きにした支保工単位部材のつなぎ材に横貫通孔を形成し、この横貫通孔に通して鋼材による横架材を山留壁背後に設置することを要旨とするものである。
【００２１】
請求項１記載の本発明によれば、まず、鋼管矢板としては、特願２００１−１９８１１２号と同じ作用が得られるものであり、つまり、鋼管と鋼管をＨ鋼の４点の端部で溶接された形状であり、Ｈ鋼で継ぐ事で複数の鋼管からなる、一体化した鋼管矢板となるので、その分強度を増す事が出来、短軸方向のみならず長軸方向の耐力を受ける事が出来る。２本の鋼管をＨ鋼で継ぐ事で剛性を十二分に考慮でき、短軸方向の二次モーメントが増える。
【００２２】
従来の施工本数に対して、継手間が単純に半分以下になるため、止水工（モルタル注入や薬注) も半分以下で済み、経済的効果が大きく、又注入量が減ることから水質汚染が減少し、環境にやさしい（環境対策）工事となる。また、連結するＨ鋼の形状を変えることにより、あらゆる曲率を持つ形状部の施工が可能となる。しかも、１本ずつ打設するより、２本同時に打設する方が有利であり、施工時間は大幅に短縮出来、海洋工事等に見られる台船使用期間の大幅な短縮は、経済的に陸上工事に比べて大きな有利となる。しかも、２本が定められた精度で継がれているために、その施工精度も高く、鉛直精度も向上する。
【００２３】
また、支保工単位部材を継手相互の結合で横向きに連結して山留壁を形成する場合に、つなぎ材およびその先の鋼管が山留壁背後に配設されるようにしたので、この部分がバットレス支持杭としての役割を発揮できる。このようにして、縦向きにした支保工単位部材を適宜間隔で介在させることで、土圧を受ける際の抗力を向上させ、強度及び剛性を上げることができる。
【００２４】
請求項２記載の本発明によれば、前記作用に加えて、縦向きにした支保工単位部材のＨ鋼材で継がれている形状を有効に利用して、腹起し材としての鋼材による横架材を簡単にかつ迅速に山留壁背後に設置することができ、この横架材が閂的な役割を発揮し、これにより受ける土圧荷重を支保工単位部材を横向きに連結してなる山留壁の全体に均一的に掛けて安定度・強度及び剛性を上げることができる。
【００２５】
【発明の実施の形態】
以下、図面について本発明の実施の形態を詳細に説明する。図１は本発明の山留支保工の第１実施形態を示す平面図、図２は同上斜視図で、本発明で使用する支保工単位部材としての鋼管矢板１も、前記特願２００１−１９８１１２号と同じく、並列させる鋼管２の相互を各鋼管２の周面に端縁が結合するＨ形のつなぎ材（板）としてＨ鋼４でこのＨ鋼４の幅分だけ間隔を存して一体的に連結し、また、かかる相互連結と反対側には継手３を設けるようにした。
【００２６】
このＨ鋼４は形鋼によるものでもまた、適宜溶接により工場等で独自に組み立てたものでもよい。形鋼を利用する場合はフランジ４ａの左右端縁を鋼管周面に溶接することになり、これら平行するフランジ４ａと鋼管２、２とで四方を囲撓した密閉空間５を形成する。図中４ｂはウエブである。
【００２７】
鋼管２、２の前記Ｈ鋼４での相互連結側と反対側には継手３を設けて二連タイプの鋼管矢板１とする。前記継手３は図８〜図１０に示す従来例と同じく種々のタイプが考えられ、特に限定はなく、本実施形態の例は図９と同一で、スリット３ａを有する環体であるＣ字形を横断面とした管体を鋼管２の周面に溶接して取り付けた。継手３は鋼管２の真横に設けるが、このスリット３ａは継手３の真横でなく、斜め方向に開口するもので、継手３が相互に対向する場合はスリット３ａは対象的向きに開口し、スリット３ａを介して継手３が互いにお互いの中に入り込むように噛み合う。
【００２８】
本発明は基本的にはこの支保工単位部材としての鋼管矢板１を継手３を介して横一列に連結していくものであるが、その間に介在させるものは、前記Ｈ形のつなぎ材（板）としてＨ鋼４で並列させる鋼管２を連結した二連タイプの鋼管矢板１を縦向きにしたものである。
【００２９】
前記介在させる縦向きの鋼管矢板１は、並列させる鋼管２のうち１つの鋼管にはＨ鋼４が接合する方向と直角の方向の左右に継手３を設け、この継手３により横向きにした鋼管矢板１と接合する。
【００３０】
その結果、介在させる縦向きの鋼管矢板１は、つなぎ材であるＨ鋼４およびその先の鋼管２が山留壁背後に配設されるようになる。
【００３１】
図１に示す第１実施形態では、横向きの鋼管矢板１同士を２個単位で接続し、その間に縦向きにした鋼管矢板１を介在させるようにしたが、第２に実施形態として図４に示すように横向きの鋼管矢板１と縦向きにした鋼管矢板１を交互に接続していく場合や第３実施形態として図５に示すように横向きの鋼管矢板１同士を３個単位で接続し、その間に縦向きにした鋼管矢板１を介在させるようにした場合等が選択できる。さらに、これら第１〜３実施形態を適宜組み合わせてもよく、また、横向きの鋼管矢板１同士を３個以上とし、その間に縦向きにした鋼管矢板１を介在させるようにしてもよい。
【００３２】
本発明は前記縦向きにした鋼管矢板１のつなぎ材であるＨ鋼４に横貫通孔１０を形成し、この横貫通孔１０に通して鋼材による横架材としてＨ鋼１１を山留壁背後に設置した。該横貫通孔１０はこの箇所にはつなぎ材であるＨ鋼４を設けないでおくことで、結果的には上下のＨ鋼４間に横貫通孔１０用の空間を確保して簡単に形成できる。
【００３３】
また、横架材としてＨ鋼１１はいわゆる腹起しとしてのものであり、そのフランジが山留壁を形成する鋼管２に接合するように水平方向に強軸方向を合わせた。このようにして横架材としてＨ鋼１１はつなぎ材であるＨ鋼４で支承することで支承のためのブラケット等を用いずとも安定して設置することができる。
【００３４】
図１１は本発明の山留支保工の支保工単位部材の強度を説明するもので、鋼管矢板１を鋼管２をφ600 、Ｈ鋼４を400 Ｈとした場合で、横向きとした場合（α）の断面２次モーメントは長さｈ30ｍでは123,000 ｃm^４／m となり、縦向きにした場合（β）の断面２次モーメントは817,479 ｃm^４／m となる。このように横向きの鋼管矢板１に対して縦向きにした鋼管矢板１は約７倍弱の断面２次モーメントを発揮できるものであり、横向きの鋼管矢板１同士の接続に、適宜縦向きにした鋼管矢板１を介在させることで強度を飛躍的に向上させることができることが判る。
【００３５】
また、横架材としてＨ鋼１１を付加することで、さらに強度は向上する。なお、前記本発明の鋼管矢板１はソイルセメント連続壁工法での芯材として建込む場合にも利用できる。その場合はソイルセメント杭の表面を削って内部の鋼管２を露出させて、Ｈ鋼１１を接合させればよい。
【００３６】
図６は本発明の第４実施形態を示すもので、支保工単位部材としての鋼管矢板１を図７にも示すように、並列させる鋼管２の相互を各鋼管２の周面にフランジ端縁が結合するＨ形のつなぎ部材としてＨ鋼４でこのＨ鋼４の幅分だけ間隔を存して一体的に連結した点は前記第１〜３実施形態と同じであるが、かかる相互連結と反対側には雄継手７、雌継手８を設けるようにした。
【００３７】
雄継手７、雌継手８は鋼管２の相互のつなぎ部材と同じく、横断面形がＨ形のものとしてフランジ７ａ、８ａとウエブ７ｂ、８ｂの組み合わせからなり、フランジ７ａ、８ａの端縁が鋼管２の周面に結合するものである。雄継手７は雌継手８に対して多少小振りなものとする。
【００３８】
雄継手７と雌継手８との嵌合は、雌継手８のフランジ８ａ間に雄継手７のフランジ７ａが入り込み、さらにフランジ７ａの先端は雌継手８のウエブ８ｂに近接し、フランジ７ａ、８ａ、ウエブ７ｂ、８ｂで囲繞された密閉空間が形成できるので、ここにトレミー管を用いてコンクリートやモルタル等の充填材９を充填することもできる。さらに、必要に応じて鉄筋をこの密閉空間に配設することも可能である。
【００３９】
縦向きの鋼管矢板１も並列させる鋼管２のうち１つの鋼管にはＨ鋼４が接合する方向と直角の方向の左右に雄継手７と雌継手８を設け、この雄継手７と雌継手８により横向きにした鋼管矢板１と接合する。
【００４０】
この第４実施形態の場合は、継手も横断面形がＨ形として継ぐ事でウエブの存在で強度を増す事が出来、短軸方向のみならず長軸方向の耐力を受ける事が出来る。すなわち、せん断力は、略管軸方向に作用するので、管軸方向に沿ってウエブという補強部材を設けることで、有効に補強することができる。また、継手同士はフランジ端を重ねるようにするだけで嵌合でき、一方の継手のフランジ先端が他方の継手のウエブに衝合するように近接して堅牢な密閉空間を得ることができる。
【００４１】
図６において、鋼管矢板１の鋼管２の外側の円はソイルセメント杭の外径を示し、多軸掘削機で掘削孔を掘削し、掘削軸の先端の掘削ヘッドからセメントミルク、ベントナイト液等、目的に適応した固結材を吐出させて土中において原位置土とミキシングし、１エレメントの壁状の削孔混練を行い、原位置にソイルセメント壁を造成する。そしてこれに芯材として鋼管矢板１を建込む。鋼管矢板１は先行エレメントに先に建込んだ本発明の鋼管矢板１に対して同様の鋼管矢板１を雄継手７と雌継手８の嵌合で連続させるように建込み、以後、同様に連続的な一体の壁体を延設していき、鋼管矢板１も延ばしていく。
【００４２】
【発明の効果】
以上述べたように本発明の山留支保工は、鋼管矢板としては、従来の鋼管矢板よりも強度を増すことになり、その結果、密閉空間が止水効果を発揮し、止水工による水質汚染が縮小され、経済効果も増し環境対策となるもので、このような鋼管矢板を支保工単位部材として利用し、自立性が極めて高く、その結果として切梁等が省略できるものである。
【図面の簡単な説明】
【図１】本発明の山留支保工の第１実施形態を示す平面図である。
【図２】本発明の山留支保工の第１実施形態を示す斜視図である。
【図３】本発明の山留支保工の縦向きにした鋼管矢板の側面図である。
【図４】本発明の山留支保工の第２実施形態を示す平面図である。
【図５】本発明の山留支保工の第３実施形態を示す平面図である。
【図６】本発明の山留支保工の第４実施形態を示す平面図である。
【図７】第４実施形態での支保工単位部材の平面図である。
【図８】従来の鋼管矢板の第１例を示す平面図である。
【図９】従来の鋼管矢板の第２例を示す平面図である。
【図１０】従来の鋼管矢板の第３例を示す平面図である。
【図１１】本発明の支保工単位部材の説明図である。
【図１２】Ｈ鋼による連結鋼管の鋼管矢板の平面図である。
【符号の説明】
１…鋼管矢板２…鋼管
３…継手３ａ…スリット
４…Ｈ鋼４ａ…フランジ
４ｂ…ウエブ５…密閉空間
６…係合溝
７…雄継手８…雌継手
７ａ、８ａ…フランジ７ｂ、８ｂ…ウエブ
９…充填材１０…横貫通孔
１１…Ｈ鋼[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a mountain retaining work used when a steel pipe sheet pile is used for construction of a structure in water or when excavation is stopped.
[0002]
[Prior art]
As a mountain retaining work used for the cut-off work, earth retaining and mountain retaining work, it is also described in the following Patent Document 1, but the steel pipe sheet pile 1 is the left and right circumference of the steel pipe 2 as shown in FIGS. The joint 3 is formed on the side, and the joints 3 are sequentially connected to each other. The joint 3 has various shapes such as a box shape and a T shape, a C shape, a combination of a C shape and a T shape, and the like is an example.
[0003]
[Patent Document 1]
Japanese Patent Publication No. 4-63167 [Patent Document 2]
Japanese Patent Laid-Open No. 2000-220135
Further, the steel sheet pile 1 may be driven by a driving (pile driving) machine using a diesel pile hammer, but this causes a large noise vibration and a construction pollution. Accordingly, a method of press-fitting with a hydraulic jack or a vibro hammer while reducing the insertion resistance by earth auger excavation is also employed, but in either case, the steel pipes 2 are set one by one.
[0005]
In this way, it is very time-consuming to insert the steel pipe 2 into the excavation hole one by one, or to place the steel pipe 2 into the excavation hole, and the insertion resistance of the joint 3 portion is large during the construction. It is easy to bend and it is difficult to ensure the vertical accuracy of the steel pipe sheet pile 1 itself. Further, when the steel auger 1 is set in the excavation hole in advance of the earth auger excavation as described above, if a multi-axis auger machine is used for the earth auger, a plurality of excavation holes can be simultaneously formed. However, since the steel pipe sheet piles 1 are arranged one by one as described above, the number of man-hours is not reduced.
[0006]
In addition, it is said that construction by the construction method is technically difficult when the water depth exceeds 10 m in the case of soft ground and exceeds 15 m in the case of solid ground.
[0007]
On the other hand, the inventor previously described Japanese Patent Application No. 2001-198112 as a steel pipe sheet pile, which increases the strength compared to the conventional steel pipe sheet pile. As a result, the sealed space exhibits a water stop effect and stops. Water pollution caused by waterworks has been reduced, and economic effects have been increased.
[0008]
As shown in FIG. 12, the steel pipe sheet pile 1 is made of H steel 4 as an H-shaped connecting material (plate) in which the edges of the steel pipes 2 to which the steel pipes 2 are arranged are joined to the peripheral surfaces of the steel pipes 2. They are integrally connected with an interval corresponding to the width, and a joint 3 is provided on the opposite side of the interconnection.
[0009]
The H steel 4 may be a shape steel, or may be independently assembled at a factory or the like by appropriate welding. When using the shape steel, the left and right end edges of the flange 4a are welded to the peripheral surface of the steel pipe, and the parallel flange 4a and the steel pipes 2 and 2 form a sealed space 5 that is bent in all directions. In the figure, 4b is a web.
[0010]
A joint 3 is provided on the opposite side of the steel pipes 2 and 2 with the H steel 4 to provide a double-type steel pipe sheet pile 1. Various types of the joint 3 are conceivable as in the conventional examples shown in FIGS. 8 to 10, and there is no particular limitation. The example of this embodiment is the same as FIG. 9, and has a C-shape that is an annulus having a slit 3 a. A tubular body having a transverse cross section was attached to the peripheral surface of the steel pipe 2 by welding. The joint 3 is provided directly beside the steel pipe 2, but the slit 3a is not beside the joint 3 but opens in an oblique direction. When the joints 3 face each other, the slit 3a opens in a target direction. The joints 3 mesh with each other so as to enter each other through 3a.
[0011]
In addition, the coupling 3 is not limited to the illustrated example, and as another embodiment, one male part is a single piece, and this is inserted into the female part by the two pieces having a distance between the other two pieces. A simple one may be used. Moreover, although illustration is abbreviate | omitted, the steel pipe 2 can also be combined with an angle by curving or bending the parallel flange 4a. If it does in this way, it will become a suitable thing for connecting and arranging the steel pipe sheet pile 1 in circular and small diameter circles, such as a ring beam. In addition, when the steel pipe sheet pile 1 is circular and has a relatively large diameter such as a ring beam, it is possible to adjust only the engagement angle of the joint 3.
[0012]
According to the steel pipe sheet pile of this Japanese Patent Application No. 2001-198112, as the steel pipe sheet pile, a sealed space surrounding the four sides with the steel pipe is formed. In other words, the steel pipe and the steel pipe are welded at the four ends of the H steel, and by joining with the H steel, it becomes an integrated steel pipe sheet pile consisting of multiple steel pipes, so the strength can be increased accordingly. Yes, it can receive the strength in the long axis direction as well as the short axis direction. The rigidity between conventional steel pipe sheet pile joints with joints at both ends is not considered in design, but the rigidity can be fully considered by joining two steel pipes with H steel, and the secondary moment in the short axis direction Will increase.
[0013]
Since the space between joints is simply less than half compared to the number of conventional constructions, water stoppage (mortar injection and chemical injection) can be reduced to less than half. Will be reduced and environmentally friendly (environmental measures) construction. In addition, it is more advantageous to place two at the same time than to place one by one, and the construction time can be greatly reduced. This is a great advantage over construction. In addition, since the two are connected with a predetermined accuracy, the construction accuracy is high and the vertical accuracy is also improved.
[0014]
[Problems to be solved by the invention]
By the way, in the case of soft ground, etc., when the excavation plane is large, for example, when one side is long, or when it is subjected to earth pressure on one side in an area close to a river, the sea, etc. The ground anchor method and the island method are used.
[0015]
Conventionally, the horizontal beam method used is the longest horizontal beam in the case of a long excavation area or when receiving earth pressure from one side in an area close to a river, the sea, etc. It becomes difficult to support the force, and there are many variations in the axial force, making it impossible to guarantee the quality of the retaining wall. In addition, the oblique ground anchor method employed under such conditions is often difficult to adopt due to restrictions on site conditions.
[0016]
In such a case, the island method is adopted. However, since this method is divided work, the construction period is long, and the construction cost is high and is not preferred.
[0017]
Therefore, no muddy water treatment is required, and the drained mud is less than other cast-in-place RC mountain retaining methods, and the soil cement column retaining wall with a short construction period and high economic efficiency can be considered. Due to the lack of strength and rigidity as a self-supporting retaining wall against pressure, stable retaining wall quality cannot be expected.
[0018]
Also, in the steel pipe sheet pile well foundation method, when the excavation depth is deep and the earth pressure acting on the steel pipe sheet pile is large, the layout plan of the cut beams installed in the well and the support piles that support them will be sufficiently examined. Conventionally, it has been necessary to devise such as utilizing a part of the steel pipe sheet pile in the well as an intermediate support pile.
[0019]
The object of the present invention is to eliminate the inconvenience of the conventional example, and as a steel pipe sheet pile, the strength is increased as compared with the conventional steel pipe sheet pile, and as a result, the sealed space exhibits a water stop effect, and the water quality by the water stop work. Contamination is reduced and economic effects are increased, which is an environmental measure. Such steel pipe sheet piles are used as support unit members, and as a result, it is possible to provide a mountain retaining work that is extremely self-supporting, and as a result, cut beams can be omitted. It is to provide.
[0020]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, according to the present invention, first, as a support unit member, a cross-sectional shape in which end edges are connected to the peripheral surfaces of the steel pipes connected in parallel with each other is integrally formed by an H-shaped connecting material. And a steel pipe sheet pile with a joint on the steel pipe, and when connecting the support unit members laterally by connecting the joints to form a retaining wall, Insert the support unit members that are vertically oriented so that the steel pipe is placed behind the mountain retaining wall at appropriate intervals, and secondly, the through holes in the connecting material of the support unit members that are vertically oriented The gist is to install a horizontal member made of steel behind the mountain retaining wall through the horizontal through hole.
[0021]
According to the first aspect of the present invention, first, as a steel pipe sheet pile, the same action as in Japanese Patent Application No. 2001-198112 can be obtained, that is, the steel pipe and the steel pipe are welded at the four end portions of H steel. Because it is an integrated steel pipe sheet pile consisting of multiple steel pipes joined by H steel, the strength can be increased by that amount, and the strength in the long axis direction as well as the short axis direction can be received. I can do it. By joining two steel pipes with H steel, the rigidity can be fully considered, and the secondary moment in the minor axis direction increases.
[0022]
Since the space between joints is simply less than half compared to the number of conventional constructions, water stoppage (mortar injection and chemical injection) can be reduced to less than half. Will be reduced and environmentally friendly (environmental measures) construction. In addition, by changing the shape of the H steel to be connected, it is possible to construct a shape portion having any curvature. Moreover, it is more advantageous to place two at the same time than to place them one by one, and the construction time can be greatly shortened. This is a great advantage over construction. In addition, since the two are connected with a predetermined accuracy, the construction accuracy is high and the vertical accuracy is also improved.
[0023]
In addition, when connecting the support unit members sideways by connecting the joints to form the retaining wall, the connecting material and the steel pipe ahead of it are arranged behind the retaining wall. Can play a role as a buttress support pile. Thus, by interposing the supporting unit members oriented vertically at appropriate intervals, it is possible to improve the drag when receiving earth pressure and increase the strength and rigidity.
[0024]
According to this invention of Claim 2, in addition to the said effect | action, the shape succeeded by the H steel material of the support unit member made into the vertical direction is utilized effectively, and the horizontal by the steel material as a flank material The frame can be installed easily and quickly behind the mountain retaining wall, and this horizontal material can play a role, and the earth pressure load received by this is connected to the support unit in the horizontal direction. The stability, strength and rigidity can be increased by evenly hanging the entire mountain wall.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing a first embodiment of a mountain retaining structure of the present invention, FIG. 2 is a perspective view of the same, and a steel pipe sheet pile 1 as a supporting unit member used in the present invention is also disclosed in Japanese Patent Application No. 2001-198112. As in the case of No. 1, the steel pipes 2 to be arranged in parallel are made of H steel 4 as an H-shaped connecting material (plate) in which the edges are joined to the peripheral surface of each steel pipe 2 with an interval corresponding to the width of the H steel 4. In addition, the joint 3 is provided on the side opposite to the interconnection.
[0026]
The H steel 4 may be a shape steel, or may be independently assembled at a factory or the like by appropriate welding. When using the shape steel, the left and right end edges of the flange 4a are welded to the peripheral surface of the steel pipe, and the parallel flange 4a and the steel pipes 2 and 2 form a sealed space 5 that is bent in all directions. In the figure, 4b is a web.
[0027]
A joint 3 is provided on the opposite side of the steel pipes 2 and 2 with the H steel 4 to provide a double-type steel pipe sheet pile 1. Various types of the joint 3 are conceivable as in the conventional examples shown in FIGS. 8 to 10, and there is no particular limitation. The example of this embodiment is the same as FIG. 9, and has a C-shape that is an annulus having a slit 3 a. A tubular body having a transverse cross section was attached to the peripheral surface of the steel pipe 2 by welding. The joint 3 is provided directly beside the steel pipe 2, but the slit 3a is not beside the joint 3 but opens in an oblique direction. When the joints 3 face each other, the slit 3a opens in a target direction. The joints 3 mesh with each other so as to enter each other through 3a.
[0028]
In the present invention, the steel pipe sheet piles 1 as the support unit members are basically connected in a horizontal row through the joints 3, and what is interposed therebetween is the H-shaped connecting material (plate ) Is a double-type steel pipe sheet pile 1 in which steel pipes 2 connected in parallel with H steel 4 are connected vertically.
[0029]
The longitudinal steel pipe sheet pile 1 to be interposed is provided with a joint 3 on the left and right of the direction perpendicular to the direction in which the H steel 4 is joined to one of the steel pipes 2 to be juxtaposed. 1 is joined.
[0030]
As a result, in the vertically oriented steel pipe sheet pile 1 to be interposed, the H steel 4 as the connecting material and the steel pipe 2 ahead are arranged behind the mountain retaining wall.
[0031]
In the first embodiment shown in FIG. 1, the steel pipe sheet piles 1 in the horizontal direction are connected in units of two, and the steel pipe sheet pile 1 in the vertical direction is interposed therebetween, but the second embodiment is shown in FIG. 4. As shown in FIG. 5 as a case where the horizontal steel pipe sheet pile 1 and the vertical steel pipe sheet pile 1 are connected alternately as shown in FIG. 5, the horizontal steel pipe sheet piles 1 are connected in units of three, The case where the steel pipe sheet pile 1 made into the vertical direction between them can be selected. Furthermore, these first to third embodiments may be combined as appropriate, or three or more horizontal steel pipe sheet piles 1 may be provided, and a vertical steel pipe sheet pile 1 may be interposed therebetween.
[0032]
In the present invention, a horizontal through hole 10 is formed in the H steel 4 which is a connecting material of the steel pipe sheet pile 1 in the vertical direction, and the H steel 11 is passed through the horizontal through hole 10 as a horizontal member made of steel material behind the mountain retaining wall. Installed. The horizontal through-hole 10 is formed simply by securing a space for the horizontal through-hole 10 between the upper and lower H-steel 4 by leaving no H steel 4 as a connecting material at this location. it can.
[0033]
Further, the H steel 11 as a horizontal member is a so-called bulge, and the strong axis direction is aligned in the horizontal direction so that the flange is joined to the steel pipe 2 forming the retaining wall. In this way, the H steel 11 as a horizontal member can be stably installed without using a bracket or the like for supporting by supporting the H steel 11 as a connecting material.
[0034]
FIG. 11 explains the strength of the support unit member of the Yamadome support of the present invention. When the steel pipe sheet pile 1 is set to φ600 for the steel pipe 2 and 400 H for the H steel 4, it is set to the horizontal direction (α). The cross sectional secondary moment is 123,000 cm ⁴ / m when the length is 30 m, and the cross sectional secondary moment when it is in the vertical direction (β) is 817,479 cm ⁴ / m. In this way, the steel pipe sheet pile 1 that is oriented vertically with respect to the horizontal steel pipe sheet pile 1 can exhibit a sectional moment of about 7 times less, and is appropriately oriented to connect the horizontal steel pipe sheet piles 1 to each other. It can be seen that the strength can be dramatically improved by interposing the steel pipe sheet pile 1.
[0035]
Moreover, strength is further improved by adding H steel 11 as a horizontal member. The steel pipe sheet pile 1 of the present invention can also be used when built as a core material in a soil cement continuous wall construction method. In that case, the surface of the soil cement pile may be shaved to expose the internal steel pipe 2 and the H steel 11 may be joined.
[0036]
FIG. 6 shows a fourth embodiment of the present invention. As shown in FIG. 7, the steel pipe sheet piles 1 as the support unit members are arranged in parallel on the peripheral surface of each steel pipe 2 with flange edges. The H-shaped connecting member to which H is coupled is the same as in the first to third embodiments in that the H steel 4 and the H steel 4 are integrally connected with an interval corresponding to the width of the H steel 4. A male joint 7 and a female joint 8 were provided on the opposite side.
[0037]
The male joint 7 and the female joint 8 are the same as the connecting members of the steel pipe 2, and the cross-sectional shape is H-shaped, and is a combination of the flanges 7a, 8a and the webs 7b, 8b. The edges of the flanges 7a, 8a are steel pipes. It couple | bonds with 2 surrounding surfaces. The male joint 7 is slightly smaller than the female joint 8.
[0038]
In fitting the male joint 7 and the female joint 8, the flange 7a of the male joint 7 enters between the flanges 8a of the female joint 8, and the tip of the flange 7a is close to the web 8b of the female joint 8, and the flanges 7a, 8a Since a sealed space surrounded by the webs 7b and 8b can be formed, a filler 9 such as concrete or mortar can be filled here using a tremy tube. Furthermore, it is also possible to arrange reinforcing bars in this sealed space as required.
[0039]
A male pipe 7 and a female joint 8 are provided on the left and right of the direction perpendicular to the direction in which the H steel 4 is joined to one of the steel pipes 2 in which the vertical steel pipe sheet piles 1 are also arranged in parallel. It joins with the steel pipe sheet pile 1 turned sideways.
[0040]
In the case of the fourth embodiment, the joint can also have an H-shaped cross section, whereby the strength can be increased by the presence of the web, and the strength in the major axis direction as well as the minor axis direction can be received. That is, since the shearing force acts substantially in the tube axis direction, it can be effectively reinforced by providing a reinforcing member called a web along the tube axis direction. In addition, the joints can be fitted by simply overlapping the flange ends, and a tight sealed space can be obtained close to each other so that the flange end of one joint abuts the web of the other joint.
[0041]
In FIG. 6, the outer circle of the steel pipe 2 of the steel pipe sheet pile 1 indicates the outer diameter of the soil cement pile, the drilling hole is excavated with a multi-axis excavator, cement milk, bentonite liquid, etc. from the excavation head at the tip of the excavation axis. The caking material suitable for the purpose is discharged and mixed with the in-situ soil in the soil, and the wall-shaped drilling and kneading of one element is performed to form the soil cement wall in the in-situ position. And the steel pipe sheet pile 1 is built in as a core material. The steel pipe sheet pile 1 is constructed so that the similar steel pipe sheet pile 1 is continuously formed by fitting the male joint 7 and the female joint 8 with respect to the steel pipe sheet pile 1 of the present invention previously built in the preceding element. A typical integral wall body is extended, and the steel pipe sheet pile 1 is also extended.
[0042]
【The invention's effect】
As described above, the Yamadome support work of the present invention, as a steel pipe sheet pile, will increase the strength compared to the conventional steel pipe sheet pile, as a result, the sealed space exhibits a water stop effect, the water quality by the water stop work Contamination is reduced, economic effects are increased, and environmental measures are taken. Such a steel pipe sheet pile is used as a supporting unit member, and is extremely self-supporting. As a result, it is possible to omit beams and the like.
[Brief description of the drawings]
FIG. 1 is a plan view showing a first embodiment of a mountain retaining work of the present invention.
FIG. 2 is a perspective view showing a first embodiment of a mountain retaining structure according to the present invention.
FIG. 3 is a side view of a steel pipe sheet pile in a vertical orientation of the mountain retaining work of the present invention.
FIG. 4 is a plan view showing a second embodiment of the mountain retaining structure of the present invention.
FIG. 5 is a plan view showing a third embodiment of the mountain retaining work of the present invention.
FIG. 6 is a plan view showing a fourth embodiment of the mountain retaining structure of the present invention.
FIG. 7 is a plan view of a support unit member according to a fourth embodiment.
FIG. 8 is a plan view showing a first example of a conventional steel pipe sheet pile.
FIG. 9 is a plan view showing a second example of a conventional steel pipe sheet pile.
FIG. 10 is a plan view showing a third example of a conventional steel pipe sheet pile.
FIG. 11 is an explanatory view of a support unit member of the present invention.
FIG. 12 is a plan view of a steel pipe sheet pile of a connecting steel pipe made of H steel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Steel pipe sheet pile 2 ... Steel pipe 3 ... Joint 3a ... Slit 4 ... H steel 4a ... Flange 4b ... Web 5 ... Sealed space 6 ... Engaging groove 7 ... Male joint 8 ... Female joint 7a, 8a ... Flange 7b, 8b ... Web 9 ... Filler 10 ... Lateral through hole 11 ... H steel

Claims

As the support unit member, two parallel pipes in which the steel pipes arranged in parallel are integrally connected to each other by a connecting member having an H-shaped cross section where the edges are joined to the peripheral surfaces of the steel pipes. It is a type of steel pipe sheet pile, and when this support unit member is connected side by side with joints to form a retaining wall, the connecting material and the steel pipe ahead of it are arranged behind the retaining wall. Yamadome support construction characterized by interposing support unit members vertically oriented at appropriate intervals.

The mountain retaining structure according to claim 1, wherein a horizontal through hole is formed in a connecting member of the support unit members that are vertically oriented, and a steel horizontal member is installed behind the mountain retaining wall through the horizontal through hole.