JP3514183B2 - Embedded pile and its construction method - Google Patents
Embedded pile and its construction methodInfo
- Publication number
- JP3514183B2 JP3514183B2 JP24526299A JP24526299A JP3514183B2 JP 3514183 B2 JP3514183 B2 JP 3514183B2 JP 24526299 A JP24526299 A JP 24526299A JP 24526299 A JP24526299 A JP 24526299A JP 3514183 B2 JP3514183 B2 JP 3514183B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- tip
- solidified material
- prefabricated
- excavation
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【発明の属する技術分野】本願発明は、市街地等での杭
基礎工事に多用される埋込み杭について、鋼管杭等の先
端が開放された中空既成杭を使用し、支持力設計上、固
定が必要となる先端部と杭外周部だけを固化させた中掘
り工法による埋込み杭およびその施工方法に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a hollow prefabricated pile, such as a steel pipe pile, whose tip is open, for embedded piles frequently used for pile foundation work in urban areas, etc. Medium excavation with only the tip and the outer periphery of the pile solidified
Ri is relates to embedded pile and its construction how by the method.
【０００２】[0002]
【従来の技術】 杭の施工方法としては、大きく分け
て、打撃工法、場所打ちコンクリート杭工法、埋込み杭
工法等があるが、市街地等では低振動、低騒音で、かつ
狭いスペースで施工できる工法として、埋込み杭工法を
適用さぜるを得ない場合が多い。2. Description of the Related Art Pile construction methods can be broadly divided into impact construction method, cast-in-place concrete pile construction method, embedded pile construction method, etc. However, construction methods with low vibration, low noise and narrow space can be used in urban areas. As a result, the embedded pile method is often applied.
【０００３】埋込み杭工法には、さらに先掘り工法、中
掘り工法、回転圧入工法等があり、このような埋込み杭
工法によって形成される埋込み杭の代表的な形態として
ソイルセメント合成鋼管杭等がある。The embedded pile construction method further includes a pre-digging method, a medium excavation construction method, and a rotary press-in construction method. As a typical form of the embedded pile formed by such an embedded pile construction method, a soil cement synthetic steel pipe pile or the like is used. is there.
【０００４】先掘り工法は、既成杭を建て込むための孔
をスパイラルオーガーあるいは先端に掘削ヘッドを設け
た掘削ロッド等の掘削装置で先掘りし、通常、掘削ヘッ
ド部分等からセメントミルク等の固化材を注入し、土砂
と攪拌・混合したソイルセメント等の中へ既成杭を沈設
して行くものであり、ソイルセメント等の固化により既
成杭を掘削孔中に固定し、支持力を得る。In the pre-digging method, holes for building prefabricated piles are pre-digged with a drilling device such as a spiral auger or a drilling rod having a drilling head at the tip, and usually cement milk or the like is solidified from the drilling head portion or the like. The material is poured and the precast piles are sunk into soil cement or the like that is stirred and mixed with earth and sand. The precast piles are fixed in the excavation hole by solidifying the soil cement or the like to obtain bearing capacity.
【０００５】なお、下端については、支持層における先
端支持力を増すため、オーガーあるいは掘削ロッドの掘
削ヘッドを拡径して拡大掘削し、富配合のセメントミル
クあるいはモルタル等を充填して既成杭を建て込み、根
固め部を形成することも多い。At the lower end, in order to increase the supporting force at the tip of the support layer, the diameter of the auger or the excavating head of the excavating rod is expanded and enlarged, and the precast pile is filled with a rich mixture of cement milk or mortar. In many cases, it is built and a root consolidation part is formed.
【０００６】また、中掘り工法は、鋼管杭あるいは中空
コンクリート杭、鋼コンクリート複合パイル等の中空の
既成杭を用い、中空部を通したオーガーあるいは掘削ロ
ッド先端の掘削ヘッドの回転により掘削を行いつつ、中
空の既成杭を建て込んで行くものである。[0006] In addition, in the medium excavation method, hollow precast piles such as steel pipe piles, hollow concrete piles, and steel concrete composite piles are used, and excavation is performed by rotating the auger through the hollow portion or the excavating head at the tip of the excavating rod. , Hollow prefabricated piles will be built.
【０００７】掘削ロッドに取り付けられる掘削ヘッドに
は、通常、掘削ビットや拡縮可能な攪拌翼、共回り防止
翼等が設けられ、水等の掘削液やセメントミルク等の固
化材を注入しながら掘削、攪拌・混合を行なえるように
なっている。The excavating head attached to the excavating rod is usually provided with an excavating bit, an expandable / contractible stirring blade, a co-rotation preventing blade, etc., and excavates while pouring a drilling liquid such as water or a solidifying material such as cement milk. , Can be stirred and mixed.
【０００８】中掘り工法の場合も、必要に応じて、先端
根固め部を形成し、先端支持力を高めることができる。
また、回転圧入工法は、杭自体をドリル形状にして杭を
回転させながら地盤中にねじ込むものであり、支持力を
発揮させるためにセメントミルク等で先端根固めを行っ
ている。Also in the case of the intermediate digging method, the tip root consolidation portion can be formed to enhance the tip supporting force, if necessary.
In the rotary press-fitting method, the pile itself is formed into a drill shape and screwed into the ground while rotating the pile, and the tip is consolidated with cement milk or the like in order to exert a supporting force.
【０００９】なお、排土量、残土処理量を減らすために
は、先掘り工法や回転圧入工法の場合も、埋込み杭用の
既成杭として鋼管杭等の先端が開放された中空杭を用い
るのが有利であり、鋼管杭を用いた埋込み杭やその施工
方法としては、例えば特開昭６３−９７７１１号公報や
特開昭６４−７５７１５号公報に記載されたものがあ
る。In order to reduce the amount of discharged soil and the amount of residual soil to be treated, even in the case of the digging method or the rotary press-fitting method, hollow piles with open ends such as steel pipe piles are used as precast piles for embedded piles. As an embedded pile using a steel pipe pile and a construction method thereof, there are those described in, for example, JP-A-63-97711 and JP-A-64-75715.
【００１０】特開昭６３−９７７１１号公報に記載され
たものは、先掘り工法によって形成されたソイルセメン
ト柱に鋼管杭を建て込む場合において、鋼管杭の外周面
のほぼ全長および鋼管杭の先端部や頭部の内面に突起を
設け、ソイルセメントとの付着力を高め、杭先端部の閉
塞効果、水平抵抗増大効果、摩擦耐力の向上を図ったも
のである。The one described in Japanese Patent Laid-Open No. 63-97711 discloses that when a steel pipe pile is built in a soil cement column formed by a digging method, almost the entire length of the outer peripheral surface of the steel pipe pile and the tip of the steel pipe pile. The protrusions are provided on the inner surface of the portion and the head to increase the adhesive force with the soil cement, to achieve the effect of closing the tip of the pile, the effect of increasing the horizontal resistance, and the improvement of the friction resistance.
【００１１】また、特開昭６４−７５７１５号公報に記
載されたものは、先掘り工法によってセメントミルク等
の固化材の注入、攪拌・混合を行いながら、鋼管杭や中
空コンクリート杭を埋込み杭として建て込んで行く際、
先端部手前で固化材をより高い圧縮強度が得られる固化
材に切り替え、先端根固め部における先端支持力の増大
を図り、また建て込まれる既成杭の外周面にスパイラル
翼を設けることで、ソイルセメント中への既成杭の回転
圧入が容易となるようにしたものである。Further, the one disclosed in Japanese Patent Laid-Open No. 64-75715 discloses a steel pipe pile or a hollow concrete pile as an embedded pile while pouring, stirring and mixing a solidifying material such as cement milk by a digging method. When building,
By switching the solidified material to a solidified material that can obtain higher compressive strength in front of the tip part, increasing the tip support force at the tip root consolidation part, and by installing spiral wings on the outer peripheral surface of the built-up pile to be built, soil It is designed to facilitate the rotational press-fitting of existing piles into cement.
【００１２】[0012]
【発明が解決しようとする課題】鋼管杭等の先端が開放
された中空既成杭の場合、掘削土砂が既成杭の中空部に
残ることで排土量、掘削残土の処理が少なくなるという
利点があるが、従来の施工方法においては、先端の根固
めや杭周面の固定（周面摩擦力の向上）のために用いる
固化材を攪拌・混合してなるソイルセメント等が中空既
成杭の中空部内にも充填された状態となるため、その
分、固化材の使用量、排土量およびコストが増すことに
なる。In the case of a hollow prefabricated pile such as a steel pipe pile whose tip is open, excavated sediment remains in the hollow part of the prefabricated pile, which has the advantage of reducing the amount of excavated soil and the processing of excavated residual soil. However, in the conventional construction method, soil cement etc. made by stirring and mixing solidifying material used for root consolidation of the tip and fixing of the pile peripheral surface (improvement of peripheral frictional force) is hollow. Since the inside of the part is also filled, the amount of the solidifying material used, the amount of soil discharged, and the cost increase accordingly.
【００１３】一方、杭の支持力の算定において重要な要
素となるのは、先端支持力と周面摩擦力である。従っ
て、中空部内のソイルセメント等については、固化材が
無駄になっている。On the other hand, the tip supporting force and the peripheral frictional force are important factors in calculating the supporting force of the pile. Therefore, the solidifying material is wasted for soil cement and the like in the hollow portion.
【００１４】本願発明は、上述のような課題の解決を図
ったものであり、中空既成杭を用いた埋込み杭工法にお
ける固化材の使用を杭先端部および杭外周部に限定する
ことで、固化材の使用量、残土処理量が少なくて済み、
コスト低減が可能な埋込み杭およびその施工方法を提供
することを目的としている。The present invention is intended to solve the above-mentioned problems, and solidifies the solidified material by limiting the use of the solidified material in the embedded pile construction method using hollow prefabricated piles to the pile tip portion and the pile outer peripheral portion. The amount of material used and the amount of residual soil treated are small,
It is an object of the present invention to provide a buried pile capable of reducing costs and a construction method thereof.
【００１５】[0015]
【課題を解決するための手段】本願の請求項１に係る埋
込み杭は、中掘り工法によって建て込まれた埋込み杭で
あって、先端が開放された中空の既成杭の杭先端部と杭
一般部外周が固化材または固化材を混合した土砂で固定
され、前記杭一般部の中空部内には実質的に固化材を含
まない土砂または充填材が充填されていることを特徴と
するものである。The embedded pile according to claim 1 of the present application is an embedded pile built by the medium excavation method.
There are, fixed with sediment which pile tip and pile general outer periphery of the prefabricated pile hollow tip is opened mixed with the solidifying material or solidified material
It is, in the hollow portion of the pile general portion and is characterized in that the sediment or filler is substantially free of solidified material is filled.
【００１６】先端が開放された中空の既成杭としては、
鋼管杭、中空コンクリート杭、鋼コンクリート複合パイ
ル等が挙げられるが、埋込み杭として施工可能なもので
あれば材質等は特に限定されない。As a hollow prefabricated pile with an open tip,
Examples include steel pipe piles, hollow concrete piles, and steel-concrete composite piles, but the material and the like are not particularly limited as long as they can be constructed as embedded piles.
【００１７】杭先端部は、通常、ある程度の支持力を発
揮できる支持地盤に到達するように施工され、先端根固
め部を形成することで先端支持力を確保することができ
る。ただし、施工条件等によっては、これに限定されな
い。The pile tip portion is usually constructed so as to reach the support ground capable of exhibiting a certain degree of support force, and the tip support portion can be secured by forming the tip root consolidation portion. However, it is not limited to this depending on the construction conditions.
【００１８】固化材としては、セメントミルクが一般的
であり、その場合、掘削土砂と攪拌・混合することでソ
イルセメントとなるが、必ずしもセメントミルク等に限
定する必要はない。また、先端根固め部を形成する場合
には、富配合としたセメントミルクあるいはモルタル
等、杭外周面の固化材に比べ、より高い強度の得られる
ものを用いることが望ましい。Cement milk is generally used as a solidifying material. In this case, soil cement is obtained by stirring and mixing with excavated soil, but it is not necessarily limited to cement milk or the like. Further, when forming the tip root-consolidating portion, it is desirable to use cement milk, mortar, or the like having a high content, which has higher strength than the solidifying material on the outer peripheral surface of the pile.
【００１９】なお、実質的に固化材を含まない土砂また
は充填材というのは、若干の固化材の混入が避けられな
い場合や、通常の固化材でなく、例えば土砂に流動性を
与えるために掘削装置の掘削ヘッド部分等から吐出され
る掘削水にベントナイトあるいはセルロースなどを配合
しておき、これを土砂と混合する場合、あるいは土砂以
外の充填材を用いる場合等を含む趣旨である。Note that the earth and sand or the filler which does not substantially contain the solidifying material means that mixing of a small amount of the solidifying material is unavoidable, or that it is not an ordinary solidifying material, for example, to give fluidity to the earth and sand. This is intended to include cases in which bentonite, cellulose, or the like is mixed with the drilling water discharged from the drilling head portion of the drilling device and the mixture is mixed with earth or sand, or a filler other than earth and sand is used.
【００２０】本願の請求項２に係る埋込み杭は、中掘り
工法によって建て込まれた埋込み杭であって、先端が開
放された中空の既成杭の杭先端部と杭一般部外周が固化
材または固化材を混合した土砂で固定され、前記杭一般
部の中空部内には前記杭一般部外周とは異なる貧配合の
固化材または固化材を混合した土砂を充填してあること
を特徴とするものである。The embedded pile according to claim 2 of the present application is a medium dug
A buried piles which Tatekoma by method is fixed in the sediment pile tip and pile general outer periphery of the prefabricated pile hollow tip is opened is mixed with solidifying material or solidified material, the hollow of the pile general portions The inside of the pile is filled with a poorly mixed solidifying material different from the outer circumference of the pile general portion or earth and sand mixed with the solidifying material.
【００２１】杭の支持力に関しては、先端支持力と周面
摩擦力から算定され、請求項１に係る発明では、杭一般
部の中空部内は実質的に固化材を含まない土砂または充
填材を充填するという構成になっているが、中空部内の
土砂の処理として杭一般部外周とは異なる貧配合の固化
材または固化材を混合した土砂を充填することが考えら
れる。The supporting force of the pile is calculated from the tip supporting force and the circumferential surface friction force. In the invention according to claim 1, the hollow portion of the general portion of the pile is filled with earth or sand or a filler which does not substantially contain a solidifying material. Although it is configured that the filling, it is conceivable to fill the soil mixed with the solidifying material or solidified material of a poor formulation that is different from the pile generally outer periphery as a process of sediment in the hollow portion.
【００２２】なお、この場合の中空部内への固化材の充
填方法としては、掘削装置の掘削ロッドの先端あるいは
掘削ヘッドの中央部から、杭一般部外周の固化材と異な
る配合の固化材を吐出する方法等が考えられる。In this case, as a method of filling the solidified material into the hollow portion, a solidified material having a different composition from the solidified material on the outer periphery of the general pile is discharged from the tip of the excavating rod of the excavator or the central portion of the excavating head. A method of doing so can be considered.
【００２３】請求項３は、請求項１または２に係る埋込
み杭について、既成杭が下端部に拡径部を有する鋼管杭
の場合を限定したものである。下端部に拡径部を有する
拡底鋼管杭は、具体的には杭一般部を構成する通常の鋼
管杭の先端に、より径の大きい短尺の鋼管を連結鋼材等
を介して溶接するか、あるいは連結鋼材部分を含め鋳物
等の形で一体化したものを溶接する等して形成すること
ができる。A third aspect of the present invention is the embedded pile according to the first or second aspect, which is limited to the case where the prefabricated pile is a steel pipe pile having a diameter-expanded portion at the lower end. The bottom expanded steel pipe pile having the expanded diameter portion at the lower end, specifically, welds a short steel pipe having a larger diameter to the tip of an ordinary steel pipe pile forming a general portion of the pile via a connecting steel material, or It can be formed, for example, by welding an integrated product such as a casting including the connecting steel material portion.
【００２４】また、鋼管杭の場合、中空コンクリート杭
や鋼コンクリート複合パイルに比べ、管厚あるいは壁厚
が薄いため、特に排土量が少なくて済むという利点があ
る。請求項４は、請求項１、２または３に係る埋込み杭
の中掘り工法による施工方法であり、下端に掘削ヘッド
を取り付けた掘削ロッドあるいはオーガーを前記既成杭
の中空部に通し、掘削ヘッドの最外周部が既成杭の外径
以上となるように拡径させて中掘り工法により地盤の掘
削および既成杭の沈設を行うに当り、拡径させた前記掘
削ヘッドの径方向先端部に設けた吐出口より、固化材を
既成杭の外径より外側に吐出しつつ攪拌し、前記吐出口
から既製杭の外径より外側に吐出した固化材が実質的に
既成杭の中空部内に入らないようにして既成杭の沈設を
行うことを特徴とする。Further, in the case of the steel pipe pile, since the pipe thickness or the wall thickness is thinner than that of the hollow concrete pile or the steel concrete composite pile, there is an advantage that especially the amount of discharged soil is small. A fourth aspect of the present invention is a method for constructing a buried pile according to the first, second or third aspect, in which a drilling rod or an auger having a drilling head attached to a lower end thereof is passed through a hollow portion of the ready-made pile to form a drilling head. It was installed on the radial tip of the expanded drilling head when expanding the diameter so that the outermost circumference was larger than the outer diameter of the existing pile and excavating the ground by the underground excavation method and digging the existing pile. From the discharge port, stir the solidified material while discharging it outside the outer diameter of the prefabricated pile so that the solidified material discharged from the discharge port outside the outer diameter of the prefabricated pile does not substantially enter the hollow part of the prefabricated pile. The feature is that the existing piles are sunk.
【００２５】すなわち、中掘り工法で施工を行うに当
り、掘削ヘッドの径方向先端部からセメントミルク等の
固化材を注入することで、中空既製杭の外側に吐出する
固化材が既成杭の中空部内に入らないように工夫したも
のである。That is, when performing the construction by the medium excavation method, by injecting a solidifying material such as cement milk from the radial tip of the excavating head, the solidifying material discharged to the outside of the hollow prefabricated pile is the hollow of the prefabricated pile. It was designed so that it would not enter the department.
【００２６】中掘り工法で用いられる掘削ロッドあるい
はオーガーは、通常、掘削ヘッド部分に掘削ビットや攪
拌翼あるいは螺旋翼等が設けられ、攪拌翼等が土圧等に
より拡縮できるようになっているものが多く、本願発明
でもそのような拡縮可能なものを用い、建て込まれる既
成杭の外径以上の径の掘削を行い、杭一般部については
固化材を既成杭の外径より外側に吐出する。The excavating rod or auger used in the medium excavation method is usually provided with an excavating bit, a stirring blade, a spiral blade or the like at the excavating head portion, and the stirring blade or the like can be expanded or contracted by earth pressure or the like. In many cases, the present invention also uses such expandable / contractible material, excavates a diameter greater than the outer diameter of the built-in pile to be built, and discharges the solidified material to the outside of the outer diameter of the existing pile in the general pile area. .
【００２７】請求項５は、請求項４に係る埋込み杭の施
工方法において、固化材の吐出を、掘削ヘッドを構成す
る攪拌翼の先端に上向きに設けた吐出口より行う場合を
限定したものである。A fifth aspect of the method for constructing a buried pile according to the fourth aspect limits the case where the solidified material is discharged from a discharge port provided upward at the tip of a stirring blade constituting the excavation head. is there.
【００２８】吐出口は、攪拌翼以外に設ける場合も考え
られるが、比較的既成杭の先端に近い位置に設けられる
攪拌翼の先端に上向きに設けることで、杭外周部に限定
した固化材の注入が容易となる。The discharge port may be provided in a place other than the stirring blade. However, by providing the discharge port upward at the tip of the stirring blade provided relatively close to the tip of the prefabricated pile, the solidifying material limited to the peripheral portion of the pile is provided. Easy to inject.
【００２９】請求項１、２または３に係る埋込み杭を施
工するための埋込み杭用施工装置としては、例えば掘削
ロッドの先端に１または複数段の拡径式の攪拌翼を設け
るとともに、前記掘削ロッドに沿って固化材注入手段を
設け、固化材を注入した掘削地盤内に中空の既成杭を建
て込むための埋込み杭施工装置において、前記攪拌翼の
先端に該攪拌翼を拡径させた状態で、前記掘削ロッド内
を通して送り込んだ固化材を前記既成杭の径より外側に
吐出するための翼部吐出口を設けたものを用いることが
できる。 Examples of the embedded pile for construction device for applying a buried piles according to 請 Motomeko 1, 2 or 3, provided with one or more stages stirring blade diameter type at the tip of the example drill rod, wherein In the embedded pile construction device for providing the solidified material injection means along the excavation rod and for building the hollow prefabricated pile in the excavated ground into which the solidified material is injected, the diameter of the stirring blade was expanded at the tip of the stirring blade. In this state, it is possible to use the one provided with a wing portion discharge port for discharging the solidified material fed through the inside of the excavating rod to the outside of the diameter of the existing pile.
it can.
【００３０】この埋込み杭用施工装置は、従来の中掘り
工法、先掘り工法などに用いられているオーガーなどの
掘削装置に相当するものである。中掘り工法の場合は、
掘削ロッドを既成杭の中空部に通した状態で掘削を行
い、翼部吐出口から固化材を既成杭の径より外側に吐出
することになる。 The buried piles for construction apparatus This digging in the conventional method, which corresponds to a drilling device such as an auger which is used like the previously digging method. In the case of the medium digging method,
The drill rod subjected to drilling in the state passed through the hollow portion of the ready-made pile, ing to be discharged outside the diameter of the prefabricated pile solidified material from the blade unit discharge port.
【００３１】請求項６は、請求項４に係る埋込み杭の施
工方法で、固化材の吐出口を掘削ヘッド部分に設けてい
たのに対し、既成杭側に注入管を設ける等して、既成杭
の杭先端部または杭外面に設けた吐出口より、固化材を
既成杭の外径より外側に吐出しつつ攪拌し、前記吐出口
から既製杭の外径より外側に吐出した固化材が実質的に
既成杭の中空部内に入らないようにして既成杭の沈設を
行うことを特徴とするものであり、固化材を杭外周部に
限定して注入する機構が比較的簡単な構造となる。[0031] A sixth aspect of the present invention is a method for constructing an embedded pile according to the fourth aspect, in which a discharge port for the solidified material is provided in the excavation head portion, while an injection pipe is provided on the side of the existing pile. From the pile tip part of the pile or the discharge port provided on the outer surface of the pile, the solidified material is stirred while discharging the solidified material to the outside of the outer diameter of the ready-made pile, and the solidified material discharged from the discharge port to the outside of the outer diameter of the ready-made pile is substantially It is characterized in that the precast pile is sunk so that it does not enter the hollow portion of the precast pile, and the mechanism for injecting the solidified material only into the peripheral portion of the pile has a relatively simple structure.
【００３２】請求項７は、請求項４、５または６に係る
埋込み杭の施工方法において、既成杭の外面に攪拌翼を
設け、既成杭の攪拌翼によって既成杭の外側に吐出され
た固化材の攪拌を行う場合を限定したものである。According to a seventh aspect of the present invention, in the method for constructing a buried pile according to the fourth, fifth or sixth aspect , a stirrer is provided on the outer surface of the prefabricated pile, and the solidifying material discharged to the outside of the prefabricated pile by the stirrer of the prefabricated pile. The case where the stirring is performed is limited.
【００３３】従来、既成杭の回転圧入を容易にする目的
で、杭外周面に螺旋状の突起等を設けたものがあるが、
請求項７では杭外周部に限定して注入された固化材を掘
削土砂と攪拌・混合する目的で既成杭の外面に攪拌翼を
設けたものである。Conventionally, for the purpose of facilitating the rotational press-fitting of the existing pile, there is one in which a spiral projection or the like is provided on the outer peripheral surface of the pile.
In claim 7 , the stirring blade is provided on the outer surface of the existing pile for the purpose of stirring and mixing the solidified material injected only in the outer peripheral portion of the pile with the excavated soil.
【００３４】この既成杭の攪拌翼による攪拌・混合は、
通常、既成杭を掘削装置の掘削ロッド等と逆向きに回転
させて行われるが、その場合に限定されず、掘削ロッド
と同じ向きに回転させる場合や、攪拌翼の形状によって
は既成杭側は回転させずに攪拌・混合を行う場合もあ
る。Stirring / mixing by the stirring blade of this ready-made pile is
Usually, it is performed by rotating the precast pile in the opposite direction to the excavation rod of the excavator, but not limited to that case, depending on the case of rotating in the same direction as the excavation rod or depending on the shape of the stirring blade, the precast pile side In some cases, stirring and mixing are performed without rotating.
【００３５】請求項８は、請求項４、５、６または７に
係る埋込み杭の施工方法において、既成杭の杭先端部に
ついて、杭一般部外周に使用される固化材より固化強度
の高い固化材を使用して、先端根固め部を形成させる場
合を限定したものである。The eighth aspect of the present invention is the method for constructing a buried pile according to the fourth, fifth, sixth or seventh aspect, in which the pile tip portion of the prefabricated pile has a higher solidification strength than the solidifying material used on the outer periphery of the general pile portion. The case where the tip root consolidation portion is formed using the material is limited.
【００３６】[0036]
【発明の実施の形態】図１は、本願の請求項１、３に係
る埋込み杭、請求項４〜８に係る施工方法の一実施形態
における施工手順を示したものである。Figure 1 DETAILED DESCRIPTION OF THE INVENTION, embedded pile according to claim 1 and 3 of this application shows the construction process of an embodiment of a construction how according to claim 4-8.
【００３７】この例では、中空の既成杭として、鋼管１
ａの先端部に拡径部１ｂを有する拡底鋼管杭１を用い、
中掘り工法によって埋込み杭としての施工を行ってい
る。以下、施工手順に沿って説明する。In this example, the steel pipe 1 is used as a hollow precast pile.
Using the expanded steel pipe pile 1 having the expanded diameter portion 1b at the tip of a,
It is constructed as a buried pile by the medium excavation method. Hereinafter, the construction procedure will be described.
【００３８】(1) 一般部掘削時（図１(a) 参照）
先端に掘削ヘッド３を取り付けた掘削ロッド２を、鋼管
杭１の中空部に挿入し、掘削ヘッド３を構成する掘削ビ
ット３ａ、上下の攪拌翼３ｂ，３ｃ、共回り防止翼３ｄ
等を拡径した状態で、掘削ロッド２を回転させ、地盤を
掘削しながら鋼管杭１を建て込んで行く。(1) When excavating a general portion (see FIG. 1 (a)) The excavating rod 2 having the excavating head 3 attached to the tip thereof is inserted into the hollow portion of the steel pipe pile 1 to constitute the excavating head 3 and the excavating bit 3a. , Upper and lower stirring blades 3b, 3c, co-rotation prevention blade 3d
In the state where the diameter of the steel pipe is expanded, the excavating rod 2 is rotated to build the steel pipe pile 1 while excavating the ground.
【００３９】この例では掘削ロッド２の先端部より掘削
水ａを地盤に注入しながら掘削を行っている。また、固
化材としてのセメントミルクｂを上側の攪拌翼３ｃの先
端上面側に設けた吐出口（図示せず）より、上方に向け
て吐出することで、セメントミルクｂが直接鋼管杭１内
に入り込まないようにしている。In this example, excavation is carried out while pouring the excavating water a from the tip of the excavating rod 2 into the ground. In addition, the cement milk b as the solidifying material is discharged upward from a discharge port (not shown) provided on the tip upper surface side of the upper stirring blade 3c, so that the cement milk b directly enters the steel pipe pile 1. I try not to get in.
【００４０】さらに、上側の攪拌翼３ｃの上方には鋼管
杭１の拡径部１ｂの内径とほぼ等しい径に拡径可能な付
着防止翼４が設けられており、杭一般部を構成する鋼管
１ａと拡径部１ｂとをつなぐ部分の隅角部に掘削土砂等
が付着し、後の先端根固め部Ａの形成に支障が生じない
ようにしている。Further, above the upper stirring blade 3c, there is provided an adhesion preventing blade 4 capable of expanding the diameter to a diameter substantially equal to the inner diameter of the expanded diameter portion 1b of the steel pipe pile 1, and the steel pipe forming the general portion of the pile. The excavated soil and the like adhere to the corner portion of the portion connecting the 1a and the enlarged diameter portion 1b, so that the formation of the tip root consolidation portion A later will not be hindered.
【００４１】この他、この例では鋼管杭１自体の外周面
に、予めガイド兼用の攪拌翼６が取り付けられており、
鋼管杭１を掘削孔の中央にガイドしつつ、上側の攪拌翼
３ｃの先端から上方に吐出されたセメントミルクｂを掘
削土砂と攪拌・混合し、杭外周部に均一なソイルセメン
ト７の固化体が形成されるようにしている。Besides, in this example, the stirring blade 6 also serving as a guide is previously attached to the outer peripheral surface of the steel pipe pile 1 itself,
While guiding the steel pipe pile 1 to the center of the excavation hole, the cement milk b discharged upward from the tip of the upper stirring blade 3c is stirred and mixed with the excavated earth and sand, and a solidified body of the soil cement 7 is uniformly formed on the peripheral portion of the pile. Are formed.
【００４２】なお、本実施形態においては、攪拌翼６を
設けた鋼管杭１を、掘削ロッド２と逆方向に回転させな
がら建て込みを行っているが、前述したように鋼管杭１
を掘削ロッド２と同方向に回転させたり、あるいは鋼管
杭１自体は回転させずに建て込む場合もある。また、図
中、５はこの種の施工において、従来から用いられてい
るスタビライザーである。In this embodiment, the steel pipe pile 1 provided with the stirring blades 6 is built while rotating in the direction opposite to the direction of the excavating rod 2.
May be rotated in the same direction as the excavation rod 2, or the steel pipe pile 1 itself may be built without rotating. Further, in the figure, 5 is a stabilizer that has been conventionally used in this type of construction.
【００４３】(2) 支持層掘削時（図１(b) 参照）
鋼管杭１の下端が支持地盤面Ｎに達したら、掘削水ａ、
および必要に応じセメントミルクｂを固化強度の高いセ
メントミルクｃに置き替えて先端根固め部の掘削を行
う。この例では杭一般部と杭先端部で掘削孔の径を同一
としているが、先端根固め部Ａについて拡大掘削を行う
場合もある。(2) When excavating the support layer (see FIG. 1 (b)) When the lower end of the steel pipe pile 1 reaches the support ground surface N, the excavation water a,
And, if necessary, the cement milk b is replaced with the cement milk c having a high solidifying strength, and the tip root consolidation portion is excavated. In this example, the diameter of the excavation hole is the same in the pile general portion and the pile tip portion, but there is also a case where the tip excavation portion A is enlarged and excavated.
【００４４】(3) 施工終了時（図１(c) 参照）
掘削が完了し、鋼管杭１の先端が支持地盤面Ｎ以下の所
定の深度に達したら、掘削ヘッド３を土圧等を利用して
径方向に縮小させ、鋼管杭１の中空部から回転させなが
ら徐々に引き上げる。(3) At the end of construction (see Fig. 1 (c)) When the excavation is completed and the tip of the steel pipe pile 1 reaches a predetermined depth below the supporting ground surface N, the excavation head 3 is used for earth pressure or the like. Then, the steel pipe pile 1 is reduced in the radial direction and gradually pulled up while rotating from the hollow portion of the steel pipe pile 1.
【００４５】なお、掘削ヘッド３を径方向に縮小させる
方法としては、鋼管杭１との接触を利用してヒンジ部分
等の回転により縮小させる方法や、油圧機構その他メカ
ニカルな縮小機構を利用して縮小させる方法もある。As a method of reducing the diameter of the excavating head 3 in the radial direction, a method of reducing the diameter by rotating the hinge portion or the like by utilizing contact with the steel pipe pile 1 or a hydraulic mechanism or other mechanical reducing mechanism is used. There is also a way to reduce it.
【００４６】以上の施工手順により、拡底鋼管杭１の先
端部が比較的高強度のソイルセメント８で固定され、一
般部の外周が比較的低強度のソイルセメント７で固定さ
れ、中空部に実質的に固化材を含まない土砂（未改良
土）９が充填された埋込み杭が形成される。By the above construction procedure, the tip end of the expanded steel pipe pile 1 is fixed with the soil cement 8 having a relatively high strength, the outer periphery of the general portion is fixed with the soil cement 7 having a relatively low strength, and the hollow portion is substantially fixed. A buried pile filled with soil (unmodified soil) 9 that does not contain solidifying material is formed.
【００４７】なお、以上の施工において掘削水ａとし
て、ベントナイトあるいはセルロース等を混入させたも
のを用い、土砂に流動性を与え、掘削および鋼管杭１の
建込みを容易にすることも考えられる。In the above-mentioned construction, it may be possible to use bentonite, cellulose, or the like as the excavation water a to impart fluidity to the earth and sand to facilitate excavation and installation of the steel pipe pile 1.
【００４８】また、本願の請求項２に係る埋込み杭に関
しては、掘削水ａの代わりに、例えばセメントミルクｂ
よりもセメント量の少ない貧配合のセメントミルクを吐
出し、鋼管杭１一般部の内部に低強度の固化体を形成す
ることが考えられる。Further, in the embedded pile according to claim 2 of the present application, for example, cement milk b is used instead of the drilling water a.
It is conceivable to discharge a poorly mixed cement milk having a smaller amount of cement than that to form a low-strength solidified body inside the general portion of the steel pipe pile 1.
【００４９】図２は、埋込み杭用既成杭としての拡底鋼
管杭１の具体的な形状の一例を示したものである。図示
した例は、拡底鋼管杭１の外周面に、鋼材からなる複数
の攪拌翼６を溶接等に取り付けたものであり、径方向の
反対側に位置する上下の攪拌翼６と、これと直交する径
方向の中間の高さに設けた攪拌翼６の合計６個の攪拌翼
６が設けられている。[0049] Figure 2 is a diagram showing an example of a specific shape of拡底steel pipe pile 1 as piles for prefabricated pile narrowing embedded. In the illustrated example, a plurality of stirring blades 6 made of steel are attached to the outer peripheral surface of the expanded steel pipe pile 1 by welding or the like, and the upper and lower stirring blades 6 located on the opposite side in the radial direction, and the orthogonal stirring blades 6 A total of six stirring blades 6 are provided, which are provided at an intermediate height in the radial direction.
【００５０】攪拌翼６の形状や配置、個数は特に限定さ
れないが、拡底鋼管杭１を回転させながら建て込んで行
く際に、鋼管杭１の外周部に注入されたセメントミルク
等の固化材と土砂の攪拌・混合ができるだけ均一に行な
えるような形状・配置が望ましい。The shape, arrangement and number of the stirring blades 6 are not particularly limited, but when the expanded bottom steel pipe pile 1 is being built while being rotated, a solidifying material such as cement milk injected into the outer peripheral portion of the steel pipe pile 1 is used. It is desirable that the shape and arrangement be such that the sand and sand can be stirred and mixed as uniformly as possible.
【００５１】[0051]
【発明の効果】(1) 本願の請求項１に係る埋込み杭で
は、固化材の使用が中空既成杭の先端部と杭一般部外周
に限定されているため、既成杭の固定に必要とする固化
材の使用量が少なくて済み、経済的である。また、請求
項２に係る埋込み杭では、固化材を用いるものの貧配合
とすることで経済的な埋込み杭を施工することができ
る。EFFECTS OF THE INVENTION (1) In the embedded pile according to claim 1 of the present application, since the use of the solidifying material is limited to the tip of the hollow precast pile and the outer periphery of the general pile portion, it is necessary to fix the precast pile. It is economical because it requires less solidifying material. Further, in the embedded pile according to the second aspect, it is possible to construct an economical embedded pile by using a solidifying material but using a poor mixture.
【００５２】(2) 中空既成杭の内部は実質的に固化材を
含まない掘削土砂あるいは埋戻し土砂等が充填されてい
るため、最終的な排土量、残土処理量も少なくて済み、
特に鋼管杭の場合には無排土に近い施工が可能である。(2) Since the inside of the hollow precast pile is filled with excavated earth or backfilled earth that does not substantially contain solidifying material, the final amount of discharged soil and the amount of residual soil to be treated are small.
Especially in the case of steel pipe piles, it is possible to perform construction close to non-removal soil.
【００５３】(3) 本願の請求項４〜６に係る埋込み杭の
施工方法によれば、固化材の掘削地盤への注入が杭外周
部等に限定され、中空既成杭の内部には実質的に固化材
が注入されないため、上記(1)、(2)の効果を有する埋込
み杭を効率よく施工することができる。(3) According to the method for constructing an embedded pile according to claims 4 to 6 of the present application, the injection of the solidified material into the excavated ground is limited to the outer periphery of the pile, etc. Since the solidifying material is not injected into, the embedded pile having the above effects (1) and (2) can be efficiently constructed.
【００５４】(4) 本願の請求項７に係る埋込み杭の施工
方法によれば、既成杭の外面にも攪拌翼が設けられ、こ
の攪拌翼で杭外周部に限定されて注入された固化材を掘
削土砂と混合・攪拌することができ、かつソイルセメン
ト等として攪拌・混合された硬化材料が中空既成杭の内
部に浸入する恐れが少ない。[0054] (4) According to the construction <br/> how the embedded pile according to claim 7 of the present application, the stirring blade is also provided on the outer surface of the ready-made pile, is limited to the pile outer peripheral portion in this stirring blade The injected solidification material can be mixed and stirred with the excavated earth and sand, and the hardened material that is stirred and mixed as soil cement or the like is less likely to enter the inside of the hollow precast pile.
【図１】 本願の請求項１、３に係る埋込み杭、請求項
４〜８に係る施工方法の一実施形態における施工手順を
示す鉛直断面図である。1 is a buried pile according to claims 1 and 3 of the present application;
It is a vertical sectional view showing the construction process of an embodiment of a construction how according to 4-8.
【図２】 埋込み杭用既成杭の具体的な形状の一例を示
したもので、(a) は平面図、(b) は鉛直断面図である。 [Figure 2] shows an example of a specific shape of the pile for prefabricated pile narrowing embedded, (a) shows the plan view, (b) Ru vertical sectional view der.
Ｎ…支持地盤面、Ａ…先端根固め部
ａ…掘削水、ｂ…セメントミルク、ｃ…セメントミルク
（富配合）
１…鋼管杭、１ａ…鋼管、１ｂ…拡径部、１ｃ…連結
部、２…掘削ロッド、３…掘削ヘッド、３ａ…掘削ビッ
ト、３ｂ…攪拌翼（下側）、３ｃ…攪拌翼（上側）、３
ｄ…共回り防止翼、４…付着防止翼、５…スタビライザ
ー、６…攪拌翼（鋼管杭側）、７…ソイルセメント（低
強度）、８…ソイルセメント（高強度）、９…土砂（未
改良土） N ... Supporting ground surface, A ... Tip consolidation part a ... Drilling water, b ... Cement milk, c ... Cement milk (rich mixture) 1 ... Steel pipe pile, 1a ... Steel pipe, 1b ... Expanded part, 1c ... Connection part, 2 ... Drilling rod, 3 ... Drilling head, 3a ... Drilling bit, 3b ... Stirring blade (lower side), 3c ... Stirring blade (upper side), 3
d ... Co-rotation prevention blade, 4 ... Adhesion prevention blade, 5 ... Stabilizer, 6 ... Stirring blade (steel pipe pile side), 7 ... Soil cement (low strength), 8 ... Soil cement (high strength), 9 ... Sediment (not yet) (Improved soil )
───────────────────────────────────────────────────── フロントページの続き (72)発明者 吉澤 幸仁 大阪府大阪市中央区北浜４丁目５番33号 住友金属工業株式会社内 (72)発明者 田中 宏征 大阪府大阪市中央区北浜４丁目５番33号 住友金属工業株式会社内 (56)参考文献 特開 平10−46573（ＪＰ，Ａ) 特開 平７−292664（ＪＰ，Ａ) 特開 昭51−94615（ＪＰ，Ａ) 特公 昭47−20146（ＪＰ，Ｂ１) 特公 昭58−17849（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) E02D 7/00 - 7/28 E02D 5/28 E02D 5/46 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor, Yoshihito Yoshizawa, 4-53 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries, Ltd. (72) Hiroyuki Tanaka, 4-chome, Kitahama, Chuo-ku, Osaka City, Osaka Prefecture No. 33 in Sumitomo Metal Industries, Ltd. (56) Reference JP 10-46573 (JP, A) JP 7-292664 (JP, A) JP 51-94615 (JP, A) JP 47-20146 (JP, B1) JP-B-58-17849 (JP, B2) (58) Fields investigated (Int.Cl. 7 , DB name) E02D 7 /00-7/28 E02D 5/28 E02D 5 / 46
Claims (8)
杭であって、先端が開放された中空の既成杭の杭先端部
と杭一般部外周が固化材または固化材を混合した土砂で
固定され、前記杭一般部の中空部内には実質的に固化材
を含まない土砂または充填材が充填されていることを特
徴とする埋込み杭。[1] An embedding built by a medium excavation method
A pile is fixed in the sediment pile tip and pile general outer periphery of the prefabricated pile hollow tip is opened is mixed with solidifying material or solidified material, substantially solidified in the hollow portion of the pile general portions embedded pile sediment or filler contains no wood is characterized in that it is filled.
杭であって、先端が開放された中空の既成杭の杭先端部
と杭一般部外周が固化材または固化材を混合した土砂で
固定され、前記杭一般部の中空部内には前記杭一般部外
周とは異なる貧配合の固化材または固化材を混合した土
砂を充填してあることを特徴とする埋込み杭。2. An embedding built by the medium excavation method.
A pile, pile tip of a hollow prefabricated pile tip is opened and the pile generally outer periphery is fixed in a sand mixed with solidifying material or solidified material, in the hollow portion of the pile general part the pile general portions An embedding pile characterized by being filled with a solidified material or a mixed sand of a solidified material of a poor composition different from the outer circumference.
管杭である請求項１または２記載の埋込み杭。3. The embedded pile according to claim 1, wherein the prefabricated pile is a steel pipe pile having an expanded diameter portion at a lower end portion.
ドあるいはオーガーを前記既成杭の中空部に通し、掘削
ヘッドの最外周部が既成杭の外径以上となるように拡径
させて中掘り工法により地盤の掘削および既成杭の沈設
を行うに当り、拡径させた前記掘削ヘッドの径方向先端
部に設けた吐出口より、固化材を既成杭の外径より外側
に吐出しつつ攪拌し、前記吐出口から既製杭の外径より
外側に吐出した固化材が実質的に既成杭の中空部内に入
らないようにして既成杭の沈設を行うことを特徴とする
請求項１、２または３記載の埋込み杭の施工方法。4. A medium excavation method in which an excavation rod or an auger having an excavation head attached to its lower end is passed through the hollow portion of the precast pile, and the diameter of the outermost periphery of the excavation head is increased to be equal to or greater than the outer diameter of the precast pile. When excavating the ground and sinking the existing pile by, from the discharge port provided in the radial tip of the expanded drilling head, the solidified material is stirred while discharging to the outside of the outer diameter of the existing pile, The precast pile is laid down so that the solidified material discharged from the discharge port to the outside of the outer diameter of the precast pile does not substantially enter the hollow portion of the precast pile. Construction method for embedded piles.
攪拌翼の先端に上向きに設けた吐出口より行う請求項４
記載の埋込み杭の施工方法。5. The discharge of the solidified material is performed from a discharge port provided upward at the tip of a stirring blade constituting the excavation head.
Construction method of the embedded pile described.
ドあるいはオーガーを前記既成杭の中空部に通し、掘削
ヘッドの最外周部が既成杭の外径以上となるように拡径
させて中掘り工法により地盤の掘削および既成杭の沈設
を行うに当り、前記既成杭の杭先端部または杭外面に設
けた吐出口より、固化材を既成杭の外径より外側に吐出
しつつ攪拌し、前記吐出口から既製杭の外径より外側に
吐出した固化材が実質的に既成杭の中空部内に入らない
ようにして既成杭の沈設を行うことを特徴とする請求項
１、２または３記載の埋込み杭の施工方法。6. A medium excavation method in which an excavation rod or an auger having an excavation head attached to the lower end is passed through the hollow portion of the precast pile, and the diameter of the outermost periphery of the excavation head is increased to be equal to or greater than the outer diameter of the precast pile. When excavating the ground and digging the prefabricated pile by the method, the solidified material is agitated while ejecting the solidified material to the outside of the outer diameter of the prefabricated pile from the ejection port provided on the tip of the prefabricated pile or the outer surface of the pile, The embedding of the prefabricated pile is performed so that the solidified material discharged to the outside of the outer diameter of the prefabricated pile from the outlet does not substantially enter the hollow portion of the prefabricated pile. Pile construction method.
攪拌翼によって既成杭の外側に吐出された固化材の攪拌
を行う請求項４、５または６記載の埋込み杭の施工方
法。7. The method for constructing an embedded pile according to claim 4, 5 or 6 , wherein a stirring blade is provided on the outer surface of the existing pile, and the solidified material discharged to the outside of the existing pile is stirred by the stirring blade of the existing pile.
周に使用される固定材より固化強度の高い固化材を使用
して、先端根固め部を形成させる請求項４、５、６また
は７記載の埋込み杭の施工方法。For pile tip of 8. prefabricated pile, using a high solidifying material of solidified strength than the fixed material to be used in the pile generally outer periphery, claim 4 and 5 to form the distal root consolidated unit, 6 also <br/> is the method for constructing the embedded pile described in 7 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24526299A JP3514183B2 (en) | 1998-09-18 | 1999-08-31 | Embedded pile and its construction method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10-264750 | 1998-09-18 | ||
| JP26475098 | 1998-09-18 | ||
| JP24526299A JP3514183B2 (en) | 1998-09-18 | 1999-08-31 | Embedded pile and its construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000154540A JP2000154540A (en) | 2000-06-06 |
| JP3514183B2 true JP3514183B2 (en) | 2004-03-31 |
Family
ID=26537134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24526299A Expired - Fee Related JP3514183B2 (en) | 1998-09-18 | 1999-08-31 | Embedded pile and its construction method |
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| Country | Link |
|---|---|
| JP (1) | JP3514183B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4471509B2 (en) * | 2001-02-01 | 2010-06-02 | 住友金属工業株式会社 | Steel pipe soil cement pile, its construction method and construction equipment |
| JP3706354B2 (en) * | 2002-03-28 | 2005-10-12 | 秀隆 小野寺 | Construction method of soil cement pile |
| JP5718432B1 (en) * | 2013-11-08 | 2015-05-13 | 日本ジオス株式会社 | Stable liquid solidification method |
| CN106638595A (en) * | 2015-10-28 | 2017-05-10 | 上海十三冶建设有限公司 | Concrete prefabricated pile rapid sinking method |
| JP6661456B2 (en) * | 2016-04-25 | 2020-03-11 | 株式会社テノックス | Drilling agitation head for steel pipe soil cement pile construction |
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1999
- 1999-08-31 JP JP24526299A patent/JP3514183B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000154540A (en) | 2000-06-06 |
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