JPH11190022A - Working method for foundation pile - Google Patents
Working method for foundation pileInfo
- Publication number
- JPH11190022A JPH11190022A JP9359085A JP35908597A JPH11190022A JP H11190022 A JPH11190022 A JP H11190022A JP 9359085 A JP9359085 A JP 9359085A JP 35908597 A JP35908597 A JP 35908597A JP H11190022 A JPH11190022 A JP H11190022A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- pile
- pipe pile
- tip
- casing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Piles And Underground Anchors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、強大な支持力と
耐久性に優れ、コスト的にも有利な基礎杭の施工法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a foundation pile, which has excellent bearing capacity and durability, and is advantageous in cost.
【０００２】[0002]
【従来の技術】日本列島の活断層は、北海道から九州ま
で全国に分布しており、主なものだけでも約１５００箇
所あるといわれている。2. Description of the Related Art Active faults in the Japanese archipelago are distributed nationwide from Hokkaido to Kyushu, and it is said that there are about 1,500 active faults alone.
【０００３】活断層の活動で起きた最近の地震では、福
井地震、伊豆大島近海地震、ごく最近の阪神淡路大震災
があり、阪神淡路大震災では、鉄筋、鉄骨コンクリート
の建造物の基礎構造が不完全なため、大小の建物や構造
物が崩壊している。[0003] Recent earthquakes caused by the activity of active faults include the Fukui earthquake, the Izu-Oshima coastal earthquake, and the very recent Hanshin-Awaji earthquake. In the Great Hanshin-Awaji earthquake, the basic structure of steel bars and steel-framed concrete structures is incomplete. For this reason, large and small buildings and structures have collapsed.
【０００４】今回の阪神淡路大震災後の調査によると、
ＰＨＣコンクリート杭による基礎杭や場所打ちコンクリ
ート杭の基礎杭では、強力地震エネルギーには、中高層
建物や一般高架高速道路でも、強度不足である結果が現
れているという事実が多く判明した。これからは、中高
層建物や一般高架高速道路は勿論、特に高層建物には地
震エネルギーに十分耐えられる基礎杭が不可欠である。According to a survey after the Great Hanshin-Awaji Earthquake,
It has become clear that the strong seismic energy of the foundation pile made of the PHC concrete pile and the cast-in-place concrete pile has a result that the strength is insufficient even in middle-high-rise buildings and general elevated expressways. From now on, foundation piles that can withstand earthquake energy are indispensable for high-rise buildings as well as middle- and high-rise buildings and general elevated expressways.
【０００５】従来、鋼管杭を用いた基礎杭の施工法は、
鋼管杭を地中に挿入し、鋼管杭の先端が支持層に侵入し
てから先端掘削ヘッドで拡掘し、鋼管杭内に挿入したト
レミー管で拡掘した部分に根固めセメントミルクを注入
し、先端支持力の増大を図った後、鋼管杭内をコンクリ
ートで埋めるようにしていた。Conventionally, a method of constructing a foundation pile using a steel pipe pile is as follows.
After inserting the steel pipe pile into the ground, the tip of the steel pipe pile penetrates into the support layer, then excavate with the tip excavation head, and inject the cement milk into the part excavated with the tremy pipe inserted into the steel pipe pile. After increasing the bearing capacity at the tip, the inside of the steel pipe pile was filled with concrete.
【０００６】[0006]
【発明が解決しようとする課題】ところで、上記のよう
な、従来の施工法による基礎杭は、根固めのためのセメ
ントミルクが、地下水の浸透などで十分な大きさに固ま
らず、強固な先端支持力が得られないと共に、鋼管杭の
地中への挿入によって発生する残土の排出量が多く、そ
の処理コストが高くつき、しかも、鋼管杭の外周面は直
接土砂に接触するので、腐食の発生が甚だしく、耐久性
に劣るという問題がある。In the above-mentioned foundation pile made by the conventional construction method, cement milk for consolidation does not harden to a sufficient size due to infiltration of groundwater or the like. In addition to the lack of bearing capacity, the amount of residual soil generated when the steel pipe pile is inserted into the ground is large, and the disposal cost is high.Moreover, since the outer peripheral surface of the steel pipe pile is in direct contact with soil, corrosion There is a problem that the occurrence is extremely large and the durability is poor.
【０００７】そこで、この発明の課題は、強固な先端支
持力が得られると共に、残土の排出量が少なく、かつ、
鋼管杭の腐食発生を完全に防止できる基礎杭の施工法を
提供することにある。Therefore, an object of the present invention is to provide a strong tip supporting force, a small amount of residual soil discharged, and
An object of the present invention is to provide a method for constructing a foundation pile that can completely prevent corrosion of steel pipe piles.
【０００８】[0008]
【課題を解決するための手段】上記のような課題を解決
するため、請求項１の発明は、地中に鋼管ケーシングを
所定深度に達するまで挿入する工程と、地中に挿入した
鋼管ケーシング内の土砂を排土する工程と、下部先端に
拡大部と周壁に通孔を有する鋼管杭を、排土後の鋼管ケ
ーシング内に上記下部先端の拡大部が所定深度まで達す
るように挿入する工程と、鋼管ケーシングを所定量引き
抜くと共に、鋼管杭内にスクリュー式の充填機を挿入
し、鋼管杭の先端部内側および通孔を介して外側にコン
クリートを所定高さまで充填する工程と、鋼管ケーシン
グを引き抜くと共に、鋼管杭の内外を埋め戻す工程とを
経る構成を採用したものである。In order to solve the above-mentioned problems, the invention of claim 1 comprises a step of inserting a steel pipe casing into the ground until a predetermined depth is reached, and a step of inserting the steel pipe casing into the ground. Removing the earth and sand, and inserting a steel pipe pile having an enlarged portion at the lower end and a through hole in the peripheral wall, so that the enlarged portion at the lower end reaches a predetermined depth in the steel pipe casing after the earth discharging. A step of extracting the steel pipe casing by a predetermined amount, inserting a screw-type filling machine into the steel pipe pile, filling concrete to a predetermined height inside the tip end of the steel pipe pile and outside through the through hole, and pulling out the steel pipe casing. In addition, a configuration is adopted in which a step of backfilling the inside and outside of the steel pipe pile is performed.
【０００９】ここで、鋼管ケーシングの地中への挿入
は、地上に設置した圧入機によって行い、鋼管ケーシン
グ内の排土は、クレーンにつり下げたバケットで掘り出
すと共に、鋼管杭の外側は砂とセメント溶液の混合物
で、同じく内側は掘削土とセメント溶液の混合物で埋め
戻すことにより、鋼管杭の内外を覆って該鋼管杭の腐食
発生を完全に防止する。[0009] Here, the steel pipe casing is inserted into the ground by a press-fitting machine installed on the ground, and the soil in the steel pipe casing is excavated by a bucket suspended by a crane. The mixture of the cement solution, which is also backfilled with the mixture of the excavated soil and the cement solution, covers the inside and outside of the steel pipe pile and completely prevents the corrosion of the steel pipe pile.
【００１０】[0010]
【発明の実施の形態】以下、この発明の実施の形態を図
示例と共に説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１１】この発明の施工法には、鋼管ケーシング１
と、この鋼管ケーシング１を地中に圧入する圧入機２
と、鋼管ケーシング１内に挿入する鋼管杭３と、鋼管ケ
ーシング１内の土砂を排土するためのバケット４と、鋼
管杭３内にコンクリートを投入するためのスクリュー式
の充填機５と、これらの各部材を吊り下げるためのクレ
ーン６とが用いられる。[0011] In the construction method of the present invention, the steel pipe casing 1
And a press-fitting machine 2 for press-fitting the steel pipe casing 1 into the ground.
A steel pipe pile 3 inserted into the steel pipe casing 1, a bucket 4 for discharging earth and sand in the steel pipe casing 1, a screw-type filling machine 5 for putting concrete into the steel pipe pile 3, And a crane 6 for suspending each member.
【００１２】図１は、鋼管杭３の先端構造を示し、厚肉
で大口径の鋼管杭３の先端部外周面に拡大シュー７が電
弧溶接によって強固に固定され、この鋼管杭３の先端内
部に拡大シュー７と略等しい高さの補強板８が十字状等
に設けてある。FIG. 1 shows the tip structure of the steel pipe pile 3. An enlarged shoe 7 is firmly fixed to the outer peripheral surface of the tip of the thick steel pipe pile 3 by electric arc welding. A reinforcing plate 8 having a height substantially equal to that of the enlarged shoe 7 is provided in a cross shape or the like.
【００１３】上記拡大シュー７は、鋼管杭３の外周面で
四箇所の位置に固定し、拡大シュー７の外径Ｄは、鋼管
杭３の外径ｄに対し、Ｄ＝ｄ×（１．２５〜１．３）が
適当であり、高さは２ｄとする。The enlarged shoes 7 are fixed at four positions on the outer peripheral surface of the steel pipe pile 3, and the outer diameter D of the enlarged shoes 7 is D = d × (1. 25-1.3) is appropriate, and the height is 2d.
【００１４】また、鋼管杭３の周壁で先端から２．５ｄ
〜３ｄの位置に通孔９が設けられ、この通孔９の周囲は
溶接した鋼板１０で補強してある。なお、拡大シュー７
の数や外径、高さ等は支持層地盤の条件によって適宜選
択すればよい。Further, 2.5 d from the tip of the peripheral wall of the steel pipe pile 3.
A through hole 9 is provided at a position of ~ 3d, and the periphery of the through hole 9 is reinforced with a welded steel plate 10. In addition, the expansion shoe 7
, The outer diameter, the height, etc. may be appropriately selected depending on the conditions of the ground of the support layer.
【００１５】鋼管ケーシング１は、拡大シュー７の外径
に対して内径が約１５〜３０cm程度大径の鋼管を用い、
継ぎ足すための連結部分がねじれに対して十分な強度を
有する構造になっている。この鋼管ケーシング１を地中
に圧入する圧入機２は、図示詳細を略したが、鋼管ケー
シング１を強固にチャッキングし、該ケーシング１に全
回転又は半回転を与えると同時に、これを地中に押し込
み又は引き抜く周知の機能と構造を有するものである。The steel pipe casing 1 uses a steel pipe having an inner diameter of about 15 to 30 cm with respect to the outer diameter of the enlarged shoe 7.
The connecting portion for adding is configured to have sufficient strength against torsion. The press-fitting machine 2 for press-fitting the steel pipe casing 1 into the ground, which is not shown in the drawings, firmly chucks the steel pipe casing 1 and gives the casing 1 a full rotation or a half rotation, and simultaneously presses the casing 1 under the ground. It has a well-known function and structure for pushing or pulling it out.
【００１６】上記スクリュー式の充填機５は、鋼管杭３
内に挿入するケーシング１１の内部にピッチの大きいス
クリュー１２を組み込み、ケーシング１１の上端にホッ
パー１３を設け、ケーシング１１の上部にスクリュー１
２を回転させる減速モータ１４を取り付けた構造になっ
ている。The screw-type filling machine 5 includes a steel pipe pile 3
A screw 12 having a large pitch is incorporated into a casing 11 inserted into the casing 11, a hopper 13 is provided at an upper end of the casing 11, and a screw 1 is provided at an upper part of the casing 11.
2 is equipped with a deceleration motor 14 for rotating the motor 2.
【００１７】次に、この発明の施工法を図２と図３を用
いて説明する。Next, the construction method of the present invention will be described with reference to FIGS.
【００１８】先ず、図２（Ａ）のように、地上に圧入機
２を設置し、クレーン６で吊り込んだ鋼管ケーシング１
を圧入機２にセットし、圧入機２の作動で鋼管ケーシン
グ１を地中に圧入し、該ケーシング１の圧入と継ぎ足し
を繰り返すことにより、図２（Ｂ）の如く、鋼管ケーシ
ング１の下部先端が支持地盤１５に達するように圧入す
る。First, as shown in FIG. 2A, a press-fitting machine 2 is installed on the ground, and a steel pipe casing 1 suspended by a crane 6.
Is set in the press-fitting machine 2, the steel pipe casing 1 is press-fitted into the ground by the operation of the press-fitting machine 2, and the press-fitting and adding of the casing 1 are repeated, as shown in FIG. Is press-fitted so as to reach the support ground 15.
【００１９】図２（Ｂ）の如く、地中に鋼管ケーシング
１の圧入が完了すると、クレーン６にバケット４をセッ
トし、鋼管ケーシング１内の土壌や荒石土、大径の玉石
を砕きながら鋼管ケーシング１の外部に排土する。As shown in FIG. 2 (B), when the press-fitting of the steel pipe casing 1 into the ground is completed, the bucket 4 is set on the crane 6, and the steel pipe is crushed while crushing the soil, rubble soil and large-diameter cobblestone in the steel pipe casing 1. The soil is discharged outside the casing 1.
【００２０】鋼管ケーシング１内の底部における残存土
壌を入念にかきだし、排土が完了すると、図２（Ｃ）の
如く、クレーン６に鋼管杭３をセットし、該鋼管杭３の
下部先端の拡大シュー７が支持地盤１５に達するよう
に、鋼管ケーシング１内に鋼管杭３を挿入する。When the residual soil at the bottom of the steel pipe casing 1 is carefully scraped out and the discharge is completed, the steel pipe pile 3 is set on the crane 6 as shown in FIG. The steel pipe pile 3 is inserted into the steel pipe casing 1 so that the shoe 7 reaches the support ground 15.
【００２１】次に、図３（Ａ）のように、鋼管杭３の内
部に充填機５をケーシング１１の下端が補強板８に近接
するように挿入し、この状態で、軟状セメントをホッパ
ー１３に投入し、スクリュー１２の回転でこれを鋼管杭
３の拡底部分に送りこむ。Next, as shown in FIG. 3A, the filling machine 5 is inserted into the steel pipe pile 3 such that the lower end of the casing 11 is close to the reinforcing plate 8, and in this state, the soft cement is put into the hopper. The steel pipe pile 3 is fed into the steel pipe pile 3 by the rotation of the screw 12.
【００２２】充填機５は、ケーシング１１の内部にピッ
チの大きなスクリュー１２を組み込み、これを回転させ
て軟状セメントを送るので、従来のトレミー管に比べ
て、軟状セメントを分離することのないよう、円滑かつ
迅速に拡底部に送り込むことができる。The filling machine 5 incorporates a screw 12 having a large pitch inside the casing 11 and rotates the screw 12 to feed the soft cement, so that the soft cement is not separated as compared with the conventional tremy tube. As a result, it is possible to smoothly and promptly feed into the expanded bottom portion.
【００２３】図３（Ｂ）のように、軟状セメントは、鋼
管杭３の内部に拡底部から４ｄの高さ程度まで打ち込
み、このとき、鋼管ケーシング１を拡底から４ｄの高さ
程度まで引き抜くことにより、軟状セメントは通孔９を
通って鋼管杭３の外部にも流出し、鋼管杭３と土壌の間
を拡底部から４ｄの高さ程度まで埋めることになり、こ
れによって、軟状セメントの硬化で鋼管杭３の先端に杭
頭ができる。As shown in FIG. 3 (B), the soft cement is driven into the inside of the steel pipe pile 3 to a height of about 4 d from the expanded bottom, and at this time, the steel pipe casing 1 is pulled out to a height of about 4 d from the expanded bottom. As a result, the soft cement flows out of the steel pipe pile 3 through the through-hole 9 and fills the space between the steel pipe pile 3 and the soil to a height of about 4d from the expanded bottom, whereby the soft cement is softened. A pile head is formed at the tip of the steel pipe pile 3 by hardening of the cement.
【００２４】この後、鋼管ケーシング１と鋼管杭３の間
の隙間に良質の砂を充填しつつ、鋼管ケーシング１を引
き抜くと共に、鋼管杭３の内部には先に掘削排土した残
土をユンボ等の重機を用いて充填する。上記砂と残土に
は適量のセメント溶液を混合しておき、図３（Ｃ）の如
く、鋼管杭３の内外をセメント硬化物で覆って施工を完
了し、基礎杭を完成する。After that, while filling the gap between the steel pipe casing 1 and the steel pipe pile 3 with good-quality sand, the steel pipe casing 1 is pulled out, and the excavated and excavated soil is removed into the inside of the steel pipe pile 3 by a dumbbell or the like. Using a heavy machine. An appropriate amount of a cement solution is mixed in the sand and the residual soil, and as shown in FIG. 3 (C), the inside and outside of the steel pipe pile 3 is covered with a hardened cement to complete the construction, thereby completing the foundation pile.
【００２５】上記のように構築された基礎杭の先端は、
強靱な厚肉鋼管杭とその先端拡大シュー７及び先端部内
外のコンクリート塊が堅固に支持地盤１５にセットさ
れ、先端は強大な支持力を発揮し、かつ、基礎杭の周辺
は完全にセメントミルクで覆われ、強力なフリクション
効果を発揮する。The tip of the foundation pile constructed as described above is
The tough steel pipe pile, its tip-enlarged shoe 7 and the concrete mass inside and outside the tip are firmly set on the supporting ground 15, the tip exerts a strong supporting force, and the periphery of the foundation pile is completely cement milk. Covered with a powerful friction effect.
【００２６】また、基礎杭の内外は、セメントミルクで
固められた永久腐食のない状態となり、強大な地震エネ
ルギーに最も適した強力な基礎杭となる。In addition, the inside and outside of the foundation pile are in a state without permanent corrosion hardened with cement milk, and become a strong foundation pile most suitable for strong earthquake energy.
【００２７】[0027]
【発明の効果】以上のように、この発明によると、地中
に鋼管ケーシングを所定深度に達するまで挿入した後内
部の土砂を排土し、下部先端に拡大部と周壁に通孔を有
する鋼管杭を、排土後の鋼管ケーシング内に上記下部先
端の拡大部が所定深度まで達するように挿入し、この
後、鋼管ケーシングを所定量引き抜くと共に、鋼管杭内
にスクリュー式の充填機を挿入し、鋼管杭の先端部内側
および通孔を介して外側にコンクリートを所定高さまで
充填し、鋼管ケーシングを引き抜くと共に、鋼管杭の内
外を埋め戻すようにしたので、完成した基礎杭は、強靱
な厚肉の鋼管杭とその先端拡大シュー及び先端部内外の
コンクリート塊が堅固に支持層にセットされ、強固な先
端支持力が得られると共に、基礎杭の周辺は完全なセメ
ントミルクにより覆われ、鋼管杭の腐食発生を完全に防
止できる。As described above, according to the present invention, after inserting a steel pipe casing into the ground until the steel pipe reaches a predetermined depth, the inside of the steel pipe is discharged, and the steel pipe having an enlarged portion at the lower end and a through hole in the peripheral wall is provided. The pile is inserted into the steel pipe casing after discharging so that the enlarged portion at the lower end reaches a predetermined depth, and thereafter, the steel pipe casing is pulled out by a predetermined amount, and a screw-type filling machine is inserted into the steel pipe pile. The concrete was filled to the specified height inside and outside through the steel pipe pile tip and through the through hole, the steel pipe casing was pulled out, and the inside and outside of the steel pipe pile were backfilled. The meat steel pipe pile, its tip expansion shoe, and the concrete mass inside and outside the tip are firmly set on the support layer to obtain a strong tip support force, and the periphery of the foundation pile is covered with complete cement milk. It is, completely prevent corrosion occurrence of the steel pipe pile.
【００２８】また、鋼管ケーシング内の掘削で生じた排
土は、鋼管杭内に埋め戻し使用するので、残土の発生が
少ないと共に、残土は汚泥化されていないので、処理コ
ストも少なくてすむ。Further, since the earth removal generated by excavation in the steel pipe casing is backfilled in the steel pipe pile, the generation of the remaining soil is small, and the remaining soil is not sludge, so that the processing cost can be reduced.
【図１】（Ａ）は鋼管杭の下部構造を示す正面図、
（Ｂ）は同上の横断平面図FIG. 1A is a front view showing a lower structure of a steel pipe pile,
(B) is a cross-sectional plan view of the above.
【図２】（Ａ）乃至（Ｃ）は基礎杭の構築法の前半の工
程を順番に示す説明図FIGS. 2A to 2C are explanatory diagrams sequentially showing the first half steps of a method for constructing a foundation pile.
【図３】（Ａ）乃至（Ｃ）は基礎杭の構築法の後半の工
程を順番に示す説明図FIGS. 3A to 3C are explanatory diagrams sequentially showing the second half of the steps of the method for constructing a foundation pile.
１ 鋼管ケーシング ２ 圧入機 ３ 鋼管杭 ４ バケット ５ 充填機 ６ クレーン ７ 拡大シュー ８ 補強板 ９ 通孔 １０ 鋼板 １１ ケーシング １２ スクリュー １３ ホッパー １４ 減速モータ REFERENCE SIGNS LIST 1 steel pipe casing 2 press-fitting machine 3 steel pipe pile 4 bucket 5 filling machine 6 crane 7 magnifying shoe 8 reinforcing plate 9 through hole 10 steel plate 11 casing 12 screw 13 hopper 14 deceleration motor
Claims (1)
るまで挿入する工程と、地中に挿入した鋼管ケーシング
内の土砂を排土する工程と、下部先端に拡大部と周壁に
通孔を有する鋼管杭を、排土後の鋼管ケーシング内に上
記下部先端の拡大部が所定深度まで達するように挿入す
る工程と、鋼管ケーシングを所定量引き抜くと共に、鋼
管杭内にスクリュー式の充填機を挿入し、鋼管杭の先端
部内側および通孔を介して外側にコンクリートを所定高
さまで充填する工程と、鋼管ケーシングを引き抜くと共
に、鋼管杭の内外を埋め戻す工程とを経ることを特徴と
する基礎杭の施工法。1. A step of inserting a steel pipe casing into the ground until a predetermined depth is reached, a step of discharging earth and sand in the steel pipe casing inserted into the ground, and an enlarged portion at a lower end and a through hole in a peripheral wall. A step of inserting the steel pipe pile into the steel pipe casing after discharging so that the enlarged portion at the lower end reaches a predetermined depth, and withdrawing the steel pipe casing by a predetermined amount, and inserting a screw-type filling machine into the steel pipe pile. A step of filling concrete to the predetermined height inside and outside through the tip end of the steel pipe pile and a step of pulling out the steel pipe casing and backfilling the inside and outside of the steel pipe pile, Construction method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9359085A JPH11190022A (en) | 1997-12-26 | 1997-12-26 | Working method for foundation pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9359085A JPH11190022A (en) | 1997-12-26 | 1997-12-26 | Working method for foundation pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11190022A true JPH11190022A (en) | 1999-07-13 |
Family
ID=18462671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9359085A Pending JPH11190022A (en) | 1997-12-26 | 1997-12-26 | Working method for foundation pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11190022A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040048710A (en) * | 2002-12-04 | 2004-06-10 | 주식회사 스마텍엔지니어링 | End Tip Apparatus for Reducing Opening Cross Section of Pipe Pile |
| JP2012112163A (en) * | 2010-11-24 | 2012-06-14 | Takenaka Komuten Co Ltd | Pile construction method in contaminated soil |
| JP2015137472A (en) * | 2014-01-21 | 2015-07-30 | 株式会社技研製作所 | Steel pipe pile and press-in method for the same |
-
1997
- 1997-12-26 JP JP9359085A patent/JPH11190022A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040048710A (en) * | 2002-12-04 | 2004-06-10 | 주식회사 스마텍엔지니어링 | End Tip Apparatus for Reducing Opening Cross Section of Pipe Pile |
| JP2012112163A (en) * | 2010-11-24 | 2012-06-14 | Takenaka Komuten Co Ltd | Pile construction method in contaminated soil |
| JP2015137472A (en) * | 2014-01-21 | 2015-07-30 | 株式会社技研製作所 | Steel pipe pile and press-in method for the same |
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