JP2001027087A - Preboring method and auger used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new preboring method capable of realizing efficient and stabilized boring without being influenced on an excavated ground such as the soil or the like, and an auger having a new structure to be used therefor. SOLUTION: This preboring method is so constituted that an auger head is put on the outside of the front end of an excavation driving shaft section, at the same time, an auger monolithically formed by projecting a pair of wing bodies 3 and 3 having stroking edges so as to make linear arrangement passing through the axial center with a flat section to a specific range of the outside upward therefrom makes excavation while making forward driving, earth and sand pushed up with the same auger head, excavation liquid or the like are rubbed on the wall surface of an excavated hole 6 dug in advance with the stroking edges of the rotational wing bodies 3 and 3 to compress into the circumferential wall surface in a pile hole in a state to daub the wall surface with the earth and sand, excavation liquid or the like, and after the excavation is made up to the required depth, a sufficient quantity of foot protection liquid is poured into the bottom of the pile hole through a milk injection section 5, and successively, the auger is pulled out from the pile hole by rising while making the auger reversely rotate and drive to bury the separately prepared existing pile into the excavated hole 6.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の目的】この発明は、既成コンクリート杭の埋め
込み工法、およびそれに関連する技術に関するものであ
って、特に、ボーリングの対象となる地質の硬軟に左右
されることなく、効率的且つ安定した穿孔を実現可能と
することができる新規な構成からなるプレボーリング工
法、およびそれに使用する新規な構造からなるオーガを
提供しようとするものである。The present invention relates to a method of embedding an existing concrete pile and a technique related thereto, and more particularly, to an efficient and stable drilling without being affected by the hardness of the geology to be drilled. The present invention aims to provide a pre-boring method having a novel structure capable of realizing the above-described method, and an auger having a novel structure used for the method.

【０００２】[0002]

【従来の技術】超高層ビルをはじめとする各種ビルディ
ングや橋梁といった各種建造物は、その自重を支えるだ
けでなく、建築物内に収容される重量物や、架橋上を走
行する車両等によって加わる外部荷重についても確実に
支持できる強度が確保されていなければならない上、地
震や風圧によって生じる複雑な外力に対しても充分な安
全が維持できるようになっていなければならず、各種建
造物の躯体構造が所定の設計強度以上のものに建設され
てなければならないと同時に、それを支える地下地盤の
地質や支持耐力等を充分に検討した上で、堅牢な基礎構
造部および基礎杭形成のための基礎工事を行う必要があ
る。2. Description of the Related Art Various buildings, such as skyscrapers and various buildings and bridges, not only support their own weight, but also are added by heavy objects accommodated in the buildings and vehicles running on bridges. It must have sufficient strength to support external loads, and must be able to maintain sufficient safety against complex external forces caused by earthquakes and wind pressure. The structure must be constructed to a design strength or higher, and at the same time, the geology and bearing capacity of the underground ground that supports it must be carefully examined before the formation of a robust foundation structure and foundation pile. It is necessary to perform foundation work.

【０００３】これまで長年に渡って基礎杭工事の多く
は、ディーゼルパイルハンマやバイブロハンマ等を使用
して大きな振動や騒音を発生してしまう工法が主流をな
してきていたが、近年では、周辺住民への悪影響が大き
な社会問題となったことから、市街地から充分離れた海
岸線や海上等、振動や騒音を問題としない地域を除き、
低騒音、低振動での施工が義務（騒音防止条例）付けら
れ、それに対応する工法として、杭の打設箇所にオーガ
を使用して先堀りし、予め地盤を緩めるか空洞状とし、
セメントミルクを注入した後、既成杭を埋設するように
した、既成杭埋込み工法の一つであるプレボーリング工
法による施工が盛んに行われるようになってきている。[0003] For many years, most pile piles have been constructed using diesel pile hammers, vibratory hammers, etc., which generate large vibrations and noises. Because the adverse impact on the city became a major social problem, except for areas where vibration and noise are not a problem, such as coastlines and seas that are sufficiently far away from urban areas,
Mandatory construction with low noise and low vibration (Noise Prevention Ordinance) is attached. As a corresponding method, excavation is first performed using an auger at the place where piles are driven, and the ground is loosened or hollowed out in advance.
After injecting cement milk, the pre-boring method, one of the pre-built pile embedding methods, in which pre-built piles are buried, has been actively performed.

【０００４】アースオーガを用いたプレボーリング工法
は、クローラ杭打機のリーダにミルク注入部を兼用する
オーガを装着し、ミルク注入部を通じてオーガヘッドの
先端側から掘削液を噴出させながら、同オーガを回転駆
動することによって地面を掘削し、回転するオーガの螺
旋状翼部に沿って掘削した土砂や掘削液等を上昇、排出
し、掘削孔内から地表に土砂を排出させ、所定深さまで
掘削した後、ミルク注入部を通じて同掘削孔中にセメン
トミルクを注入しながら抜き去り、既成杭を所定深さに
埋設してしまうようにする工事となるが、オーガの上下
略全長に渡って形成された螺旋状翼部によって上昇させ
た土砂や掘削液等は、掘削箇所の地上部周辺に排出させ
てしまうため、特に、掘削孔から溢れ出した掘削液は、
そのまま野放しにされて新たな公害源になることから、
「廃棄物の処理および清掃に関する法律」や「水質汚泥
防止法」その他各都道府県の条例等によって厳しく規制
されていて、その対策に苦慮しなければならないことに
なる。In the pre-boring method using an earth auger, an auger serving also as a milk injection unit is mounted on a leader of a crawler pile driving machine, and drilling liquid is ejected from a tip side of an auger head through the milk injection unit, and the auger is used. Excavates the ground by rotating and driving up the excavated soil and drilling fluid along the spiral wings of the rotating auger, and discharges it. After that, cement milk is injected into the drilling hole through the milk injection section and extracted, and the existing pile is buried at a predetermined depth, but it is formed over almost the entire length of the auger up and down The earth and sand, drilling fluid, etc. raised by the spiral wings are discharged around the ground above the drilling site.
Because it is left unchecked and becomes a new source of pollution,
It is strictly regulated by the Waste Management and Public Cleansing Law, the Water Sludge Prevention Law, and other ordinances of each prefecture, and you must struggle with such measures.

【０００５】また、施工段階の問題としても、このオー
ガは、所定の掘削を終え、抜き去る作業に移行した段階
に、その螺旋状翼部の間に土砂等を目詰まりしたままと
なっている場合には、その部分が掘削孔壁面全周に密着
して密閉状の栓のような作用を及ぼし、引上げようとす
ると、それより下の空間が減圧状態となってしまってオ
ーガの効率的な引き抜き作業に支障を来すという難点を
有する上、施工箇所が湿地や砂地等の軟弱な地質の場合
には、オーガを抜き去り、既成杭を打ち込むまでの間
に、掘削孔がその形状を維持しきれずに崩れてしまい、
既成杭の埋設が不可能となったり、所望する深さまで打
ち込むことができなくなり、再び掘削をやり直さなけれ
ばならないようなケースも出てくる等といった、工事の
効率化に直接係わってくる課題も残されている。[0005] In addition, as a problem in the construction stage, the auger is still clogged with earth and sand between the spiral wing portions at the stage when the predetermined excavation is completed and the operation shifts to the extraction operation. In such a case, the portion closely adheres to the entire circumference of the borehole wall and acts like a closed plug, and when trying to pull it up, the space below it is depressurized and the auger is efficiently In addition to the drawbacks that hinder the pulling operation, if the construction site is of weak geology such as wetland or sandy ground, the excavation hole maintains its shape until the auger is pulled out and the existing pile is driven. It collapsed without being able to do it,
There are still issues directly related to the efficiency of construction, such as the inability to bury existing piles, the inability to drive to the desired depth, and the need to redo the excavation in some cases. Have been.

【０００６】そのため、例えば、特開平７−６８８３８
号公報に記載された、外周面を平断面四角形状に形成さ
れたオーガロッドの下方に、螺旋状翼を有するオーガヘ
ッドを一体に連結してなるオーガの例に見る発明のよう
に、特に、オーガを抜き取った後の掘削孔の崩壊に対処
しようとする提案もなされているが、この既に提案済み
の発明では、四角断面のオーガロッドの四隅の角を丸
め、回転過程でその部分を掘削孔内周面に押し付け、当
該内周面を強化して崩壊に備えるには、掘削箇所の土質
が粘土質のような比較的弾力性のある掘削現場に限ら
れ、砂礫質のような弾力性のない箇所での掘削では殆ど
効果が期待できないだけではなく、掘削孔内周面と四角
断面のオーガロッドとの間に確保できる空間がかなり小
さ目のものであって、掘り上げられてくる土砂の逃げ場
として不十分なものになり、円滑な回転作動に支障を来
してしまう虞もある等といった実用上での不都合を残し
たままのものでしかなかった。For this reason, for example, Japanese Patent Application Laid-Open No. 7-68838
In particular, as in the invention described in the example of an auger in which an auger head having a spiral wing is integrally connected below an auger rod whose outer peripheral surface is formed in a square cross section in a flat shape described in Japanese Patent Application Publication No. There have been proposals to deal with the collapse of the drilling hole after the auger was removed, but in this already proposed invention, the four corners of the auger rod with a square cross section were rounded, and that part was drilled during the rotation process. In order to press against the inner peripheral surface and strengthen the inner peripheral surface to prepare for collapse, the soil at the excavation site is limited to a relatively elastic excavation site such as clay, Not only is there little effect expected from excavation where there is no excavation, but the space that can be secured between the inner peripheral surface of the borehole and the auger rod with a square cross section is quite small, and a refuge for excavated earth and sand As inadequate as Ri, was only intended remain leaving a disadvantage in practical use such like are also feared that disturbed the smooth rotation operation.

【０００７】この発明は、上述したようなプレボーリン
グ工法の実情に鑑み、これまでの諸々の問題点を解決し
て基礎杭工事の効率化と無公害化とが果たせないないも
のかとの判断から、逸速くその開発、研究に着手し、長
期に渡る試行錯誤と幾多の試作、実験とを繰り返してき
た結果、今回、遂に新規なプレボーリング工法、および
それに使用する新規な構造のオーガを実現化することに
成功したものであり、以下では、図面に示すこの発明を
代表する実施例と共に、その構成を詳述することとす
る。The present invention has been made in view of the above-mentioned situation of the pre-boring method, and it has been determined whether or not various problems can be solved to improve the efficiency of the foundation pile construction and eliminate pollution. As a result of a lot of trial and error, many trial productions, and many experiments, we have finally realized a new pre-boring method and a new structure auger to be used for it. In the following, the structure will be described in detail together with an embodiment representative of the present invention shown in the drawings.

【０００８】[0008]

【発明の構成】図面に示すこの発明を代表する実施例か
らも明確に理解されるように、この発明に包含されるプ
レボーリング工法は、基本的に次のような構成から成り
立っている。即ち、ミルク注入部を兼用する掘削駆動軸
部の先端外側にオーガヘッドが装着されると共に、それ
より上方外側所定範囲に渡り、一対の押撫縁付き翼体部
が平断面で軸心を通る直線状配置となるようにして突
設、一体化されてなるオーガを、正回転駆動しながら先
端オーガヘッドで掘削、穿孔すると共に、該オーガヘッ
ドによって上昇、排除される土砂および掘削液等を、オ
ーガヘッドと共に同心状に回転する翼体部の各押撫縁
で、先行形成されていく掘削孔壁面に擦り付けて孔壁面
に圧縮、塗着状としながら、目的深さまで掘削した後、
ミルク注入部を通じて孔底に充分な量の根固め液を注入
し、続いて、オーガを逆回転駆動しながら上昇させて掘
削孔中から抜き去り、別途準備された既成杭を掘削孔中
に埋設するようにする構成を要旨とするものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS As will be clearly understood from the embodiments of the present invention shown in the drawings, the pre-boring method included in the present invention basically has the following configuration. That is, an auger head is mounted on the outer side of the tip of the excavation drive shaft that also serves as the milk injection unit, and a pair of winged wings with a flattened edge passes through the axis in a flat cross section over a predetermined range above and outside. The auger, which is protruded and integrated so as to have a shape-like arrangement, is excavated and drilled with the tip auger head while being driven in the forward direction, and the auger removes earth and sand and drilling liquid that are lifted and removed by the auger head. After digging to the target depth while rubbing against the excavation hole wall that is formed in advance and compressing and applying it to the hole wall surface at each stroke edge of the wing body part that rotates concentrically with the head,
Inject a sufficient amount of consolidation liquid into the bottom of the hole through the milk injection part, then raise the auger while driving it in reverse rotation, remove it from the borehole, and bury a separately prepared existing pile in the borehole The gist of the present invention is a configuration for performing the above.

【０００９】この基本的な構成を、より具体的な構成で
示すと、ミルク注入部を兼用する掘削駆動軸部の先端外
側にオーガヘッドが装着されると共に、それより上方外
側で、掘削する孔深さの１／２〜２／３程度の長さ範囲
に渡り、一対の押撫縁付き翼体部が平断面で軸心を通る
直線状配置となるようにして突設、一体化されてなるオ
ーガを、正回転駆動しながら先端オーガヘッドで掘削、
穿孔すると共に、該オーガヘッドによって上昇、排除さ
れる土砂および掘削液等を、オーガヘッドと共に同心状
に回転する翼体部の各押撫縁で、先行形成されていく掘
削孔壁面に擦り付けて孔壁面に圧縮、塗着状とする一
方、それ以外の更に上方に上昇、排除される土砂および
掘削液等については、翼体部上端よりも上方に確保され
ていく充分な容積の掘削孔内に留められ、掘削孔から溢
れ出してしまうことがないようにしながら、目的深さま
で掘削した後、ミルク注入部を通じて孔底に充分な量の
根固め液を注入し、続いて、オーガを逆回転駆動しなが
ら上昇させて掘削孔中から抜き去り、別途準備された既
成杭を掘削孔中に埋設する如くした構成を要旨とするプ
レボーリング工法となる。ものである。More specifically, the basic configuration is shown in a more specific configuration. An auger head is mounted on the outer side of the tip of a digging drive shaft that also serves as a milk injection section, and a hole to be digged above the auger head. Over a length range of about 1/2 to 2/3 of the depth, a pair of winged wings with a stroked edge is projected and integrated so as to have a flat cross section and a linear arrangement passing through the axis. Excavating the auger with the tip auger head while driving it forward,
While drilling, the soil and drilling liquid that are raised and removed by the auger head are rubbed against the wall surface of the previously formed drill hole at each stroked edge of the wing body rotating concentrically with the auger head. While the wall surface is compressed and coated, other soil and excavated liquid that rises and is removed further upwards should be placed in a borehole with a sufficient volume secured above the upper end of the wing body. After drilling to the target depth while preventing it from overflowing from the drill hole, a sufficient amount of consolidation liquid is injected into the hole bottom through the milk injection part, and then the auger is driven in reverse rotation The pre-boring method has a configuration in which the pile is lifted up and removed from the borehole, and a separately prepared existing pile is buried in the borehole. Things.

【００１０】上記のとおりの構成を要旨とするこの発明
のプレボーリング工法には、掘削中に所定深さまで達し
た段階に、予め折り畳まれるか、あるいは縮小されてい
たオーガヘッドの翼部を展開あるいは伸長させて正回転
駆動掘削を継続し、それまで掘削してきた掘削孔径を拡
大した掘削をしながら、目的深さまで掘削し、ミルク注
入して拡大根固めし、オーガを逆回転駆動しながら上昇
させて掘削孔中から抜き去る前の段階には、オーガヘッ
ドの翼部を再度折り畳むか、あるいは縮小するかする構
成を付加した工法を包含する外、一対の翼体部における
各押撫縁間の寸法が、オーガヘッドによって上昇、排除
されてくる土砂および掘削液等の掘削孔壁面への所望塗
着厚に応じた分だけ、オーガヘッドの径よりも小さく設
定され、孔壁への土砂および掘削液等の圧縮、塗着を促
進しながら掘削するようにした構成からなる工法も包含
されている。In the pre-boring method according to the present invention having the above-described structure, the wing portion of the auger head which has been folded or reduced in advance is expanded or cut when reaching a predetermined depth during excavation. Extend the drilling in the forward rotation and continue drilling, drilling to the target depth while drilling with the drilling hole diameter drilled so far, injecting milk to expand the roots, and raising the auger while driving the auger in reverse rotation In the stage before pulling out from the excavation hole, the method includes a method of re-folding or shrinking the wings of the auger head. The dimension is set smaller than the diameter of the auger head by an amount corresponding to the desired coating thickness of the soil and drilling fluid that are raised and removed by the auger head on the wall surface of the drilling hole. Sand and drilling fluid compression such, are also encompassed method having the configuration which is adapted to excavate while promoting the coating.

【００１１】上記のとおりの構成によって実施されるこ
の発明のプレボーリング工法において、オーガの正回転
駆動、逆回転駆動、および昇降移動等の作動は、従前か
らスパイラルオーガ装着用として使用されているクロー
ラ杭打機がそのまま使用可能であって、リーダ上端に装
備したオーガモータによる回転駆動、およびその昇降作
動によって実施されると共に、工事の進行に際しても、
オーガ先端からの掘削液の噴出、所定深度掘削後の根固
め液の注入、その後必要に応じて実施される杭周固定液
の充填等、従前からのスパイラルオーガによる掘削およ
び既成杭の建て込みに併用されてきた一連の施工円滑化
手段はそのままか、あるいは適宜応用するかして実施す
ることができる。In the pre-boring method of the present invention implemented by the above-described configuration, the operations such as the forward rotation drive, the reverse rotation drive, and the vertical movement of the auger are performed by the crawler conventionally used for mounting the spiral auger. The pile driver can be used as it is, and it is carried out by the rotation drive by the auger motor mounted on the upper end of the reader and its raising and lowering operation.
For excavation of drilling fluid from the tip of the auger, injection of consolidation fluid after drilling at a predetermined depth, and then filling of pile surrounding fixation fluid as needed A series of construction facilitating means that have been used in combination can be implemented as they are, or by appropriately applying them.

【００１２】オーガは、必要とする杭孔深さに対応でき
るよう、ミルク注入部を兼用する掘削駆動軸部のオーガ
モータ装着側の部分と、それよりも下方の一対の押撫縁
付き翼体部形成部分、先端側のオーガヘッド部分とは適
宜着脱自在構造で接続、一体化可能に形成され、必要が
あれば押撫縁付き翼体部形成部分自体も、その全長の調
節と取扱い性や製造性等との兼ね合いから、定長に形成
したものを適宜継ぎ足し可能となるようにしたものとす
ることができ、オーガモータに直接か、あるいは定長の
掘削駆動軸部を介して押撫縁付き翼体部を接続し、その
下端にオーガヘッドを装着し、掘削の進行に従って先の
押撫縁付き翼体部の上に更に押撫縁付き翼体部を継ぎ足
すか、あるいは定長の掘削駆動軸部だけを継ぎ足してい
くかは、杭孔の深さや土質等を考慮した上で最適な組み
合わせ構造となるようにすべきであり、特に押撫縁付き
翼体部の杭孔深さ内で占める長さ割合は、掘削液や根固
め液、そして必要に際して使用することなる杭周固定液
等の地上部への溢出を極力防止できるようにするため
に、掘削する杭孔深さの１／２〜２／３程度の長さ範囲
に止めるような組み合わせ構造とするのが望ましい。The auger has a digging drive shaft portion also serving as a milk injection portion on the side where the auger motor is mounted, and a pair of wing portions having a pair of squeezed edges below the auger drive shaft portion so as to correspond to a required pile hole depth. And the auger head on the tip side can be connected and integrated as appropriate with a detachable structure as appropriate, and if necessary, the wing body forming part with a stroked edge itself can also be adjusted for its full length, handleability, manufacturability, etc. In consideration of the above, it is possible to appropriately add the one formed to the fixed length so that the wing body with the stroked edge can be directly added to the auger motor or via the fixed length excavation drive shaft part. Connect the auger head to the lower end of the wing, and add a winged body with a stroked edge on the winged body with a stroked edge as the excavation progresses, or add only a fixed length excavation drive shaft. The depth of the pile hole The optimum combination structure should be considered in consideration of soil and soil properties, and especially the proportion of the winged body with the stroked edge in the depth of the pile hole depends on the drilling fluid, In order to minimize the leakage of the fixed liquid around the pile, which will be used at the time of the pile, to the ground part, the combination should be limited to a length range of about 1/2 to 2/3 of the depth of the pile hole to be excavated. It is desirable to have a structure.

【００１３】所定深さの杭孔掘削工程を終え、根固め液
やセメントミルク等を注入しながらオーガを引き抜く工
程では、押撫縁付き翼体部の押撫縁で形成した孔壁強化
面を破壊してしまうことがないようにするため、オーガ
は、その回転を停止したままや正回転しながら実施して
はならず、必ず掘削段階の回転とは逆回転となるように
し、両押撫縁付き翼体部の押撫縁間の距離に等しいかそ
れよりもやや大きく設定するオーガヘッドの掘削縁が、
孔壁強化面に螺旋を描いて抜け出してくるような施工を
実施するようにしなければならない。[0013] In the step of pulling out the auger while injecting a consolidation liquid, cement milk, or the like after excavating the pile hole having a predetermined depth, the hole wall reinforcing surface formed by the stroking edge of the wing body portion with the stroking edge is destroyed. The auger must not be run with its rotation stopped or rotating forward to prevent it from rotating. The digging edge of the auger head, which is set equal to or slightly larger than the distance between the stroking edges of the wing,
It is necessary to carry out construction that draws a spiral on the hole wall reinforcement surface and comes out.

【００１４】[0014]

【関連する発明】上記したプレボーリング工法に関連
し、この発明には、そのプレボーリング工法に使用する
オーガも包含しており、その構成の要旨は、基本的に次
のとおりのものである。即ち、ミルク注入部を兼用する
掘削駆動軸部の先端外側に、回転軸芯を中心とする螺旋
状翼部、または複数枚に分断され、螺旋状配置とした翼
部、あるいは、掘削方向に略直交状となり、掘削面に鉤
状爪部を有する円盤状翼部、または同一平面内に属し、
複数枚に分断され、掘削面に鉤状爪部を有する板状翼部
等からなるオーガヘッドを装着すると共に、それより上
方外側所定範囲に渡り、夫々の平断面形状が、掘削する
孔断面の内径に略達する長径をもつ楕円形状、長円形
状、または対角線の中の長尺な一方を、同孔断面の内径
に達するようにした菱形状、あるいは、略頂角に丸みを
付けた略三角形や台形、将棋形等の多角形状等とした一
対の押撫縁付き翼体部を、平断面で軸心を通る直線状配
置となるようにして突設、一体化してなる構成を要旨と
するオーガである。[Related Invention] In relation to the above pre-boring method, the present invention also includes an auger used in the pre-boring method, and the gist of the configuration is basically as follows. That is, on the outer side of the tip of the excavation drive shaft that also serves as the milk injection unit, a spiral wing around the rotation axis, or a wing that is divided into a plurality of pieces and has a spiral arrangement, or substantially in the excavation direction. Become orthogonal, belonging to the disc-shaped wing part having a hook-shaped claw part on the excavation surface, or in the same plane,
Attached with an auger head composed of a plate-like wing portion or the like having a hook-shaped claw portion on the excavation surface, and over a predetermined range above and outside thereof, each of the cross-sectional shapes of the excavation hole is An elliptical shape with a major axis almost reaching the inside diameter, an elliptical shape, or a long one of the diagonal lines, a rhombus shape that reaches the inside diameter of the same hole cross section, or a substantially triangular shape with a rounded apex angle The auger has a structure in which a pair of wings with a stroked edge, such as a polygonal shape such as a sword, a trapezoid, or a shogi, is protruded and integrated into a linear configuration that passes through the axis in a flat cross section. It is.

【００１５】また、この基本的な構成からなるオーガに
は、ミルク注入部を兼用する掘削駆動軸部の外側所定箇
所に装着または一体化されてなるオーガヘッドと一対の
押撫縁付き翼体部とが、夫々対応する掘削駆動軸部分に
おけるオーガヘッド側は上端と、同押撫縁付き翼体部側
は下端とにおいて着脱自在構造で連結されてなるように
したもの、および／または、ミルク注入部を兼用する掘
削駆動軸部の外側所定箇所に一体化されてなる一対の押
撫縁付き翼体部が、その上下方向長さ寸法を、掘削する
孔深さの１／２〜２／３程度のものに規制して設定され
てなるものとし、一対の押撫縁付き翼体部よりも上方と
なる掘削駆動軸部周りの掘削孔内に、オーガヘッドによ
って上昇、排除される土砂および掘削液等を一時的に収
容したままとすることが可能となるような構成にしたオ
ーガを包含しており、更にまた、それらは、一対の翼体
部における各押撫縁間の寸法が、オーガヘッドによって
上昇、排除されてくる土砂および掘削液等の掘削孔壁面
への所望塗着厚に応じた分だけ、オーガヘッドの径より
も小さく設定してなるものに構成されるようにするのが
望ましい。The auger having this basic configuration includes an auger head mounted or integrated at a predetermined position outside a drilling drive shaft also serving as a milk injection unit, and a pair of wings with a stroked edge. However, the auger head side of the corresponding excavation drive shaft portion is connected to the upper end, and the winged body side with the stroked edge is connected to the lower end with a detachable structure. A pair of winged wings with a stroked edge, which are integrated at a predetermined location outside the excavating drive shaft, also have a vertical dimension of about 1/2 to 2/3 of the depth of the hole to be excavated. In the excavation hole around the excavation drive shaft part that is above the pair of stroked wings, sediment, excavation liquid, etc., which are raised and eliminated by the auger head, are temporarily set. To be kept And the auger head is configured to allow the auger head to raise and remove the dirt and digging between the stroking edges of the pair of wings. It is desirable that the diameter of the auger head is set to be smaller than the diameter of the auger head by an amount corresponding to a desired coating thickness of the liquid or the like on the wall surface of the borehole.

【００１６】掘削駆動軸部は、従前からスパイラルオー
ガ装着用として使用されているクローラ杭打機のリーダ
に装備したオーガモータによる回転駆動力を受け、後述
の一対の押撫縁付き翼体部およびてオーガヘッドを回転
させる軸棒としての機能、および掘削液を始めとする各
種注入液を送り込むための導管としての機能を果たすも
のであり、オーガモータの回転力取出し軸に接続する部
分、一対の押撫縁付き翼体部を平断面で直線状配置に取
着する部分、およびオーガヘッドの軸心となる部分とを
基本的に有していると共に、それらの軸心部分には、上
下に連通する管路状のミルク注入部が形成されるように
したものとしなければならず、しかも、掘削すべき杭孔
長への対応や、取扱い性、製造性等との兼ね合いから、
各部が着脱自在構造となるようにしたものとするのが望
ましく、押撫縁付き翼体部を取着した掘削駆動軸部とは
別に、オーガモータの回転力取出し軸に接続する機能だ
けの掘削駆動軸部を用意し、オーガモータの回転力取出
し軸と押撫縁付き翼体部を取着した掘削駆動軸部との間
に当該掘削駆動軸部を介在、接続するようにする場合
も、当該掘削駆動軸部が、定長のものを着脱自在に接続
できて所定深さの杭孔掘削が可能になるようにする。The excavating drive shaft portion receives a rotational driving force from an auger motor mounted on a leader of a crawler pile driving machine, which has been conventionally used for mounting a spiral auger, and receives a pair of winged wing portions having a stroked edge and a front auger described later. It functions as a shaft rod for rotating the head and as a conduit for feeding various infusions such as drilling fluid.It has a portion connected to the auger motor's rotational output shaft and a pair of stroked edges. It has basically a portion for attaching the wing body portion in a linear arrangement in a plane cross section, and a portion serving as the axis of the auger head. Milk injection part must be formed.Moreover, in consideration of the length of the pile hole to be excavated, handling, and manufacturability,
It is desirable that each part has a detachable structure, and apart from the excavation drive shaft part to which the wing body part with the stroked edge is attached, the excavation drive shaft only has a function of connecting to the rotational force extraction shaft of the auger motor. When the excavation drive shaft is interposed and connected between the rotational force extraction shaft of the auger motor and the excavation drive shaft attached with the wing body portion with the stroked edge, the excavation drive shaft is also provided. The part can detachably connect a fixed-length one, so that a pile hole of a predetermined depth can be excavated.

【００１７】なお、オーガモータと掘削駆動軸部、掘削
駆動軸部同士の着脱自在構造は、掘削駆動軸部に伝達さ
れる回転駆動力が、押撫縁付き翼体部やオーガヘッドに
確実に伝達可能となるよう充分な強度で連結できる構造
にすると共に、ミルク注入部の掘削液やセメントミルク
の注入機能を損ねることのない構造としなければなら
ず、例えば、押撫縁付き翼体部とオーガヘッドとの互い
の連結部の中の何れか一方を円柱状のものに形成し、他
方を該円柱状部を嵌合する円柱状凹欠部とした上、双方
を嵌合、連結し、側面からボルトまたはピン等を挿入し
て連結、仮固定できるように構成したものとする外、回
転駆動により、双方の抜け止め機能を果たすボルトまた
はピン等への曲げあるいは剪断負担を軽減するため、中
心部に同心状に突出する四角柱状または六角柱状等の多
角柱状のものに形成し、同他方を、多角柱状部分が嵌合
する多角形凹欠部にして連結、仮固定できるようにすれ
ば、極めて好都合のものとすることができる。The detachable structure between the auger motor, the excavation drive shaft, and the excavation drive shaft allows the rotational drive force transmitted to the excavation drive shaft to be reliably transmitted to the wing body with the stroked edge and the auger head. In addition to a structure that can be connected with sufficient strength so that it becomes, it must be a structure that does not impair the function of injecting the drilling fluid or cement milk at the milk injection part, for example, a wing body with a stroked edge and an auger head One of the connecting portions is formed into a cylindrical shape, and the other is formed into a cylindrical concave portion into which the cylindrical portion is fitted. In addition, it is designed to be able to connect and temporarily fix by inserting pins etc.In addition, it is necessary to reduce the bending or shearing load on bolts or pins etc. Concentrically project It is extremely convenient if it is formed in a polygonal prismatic shape such as a square pillar shape or hexagonal pillar shape, and the other is made into a polygonal concave portion in which the polygonal pillar portion fits so that it can be connected and temporarily fixed. be able to.

【００１８】ミルク注入部は、上記したとおり、掘削駆
動軸部のもう一つの機能を果たす部分であり、オーガヘ
ッドの先端へ、掘削液やセメントミルクを供給できるよ
う管路状に形成され、着脱自在構造とした場合であって
も同着脱構造部分から掘削液やセメントミルク等の流出
が起こらないよう構成しなければならず、また、オーガ
ヘッド先端側や着脱自在構造部分等に外圧を受けたとき
にも、掘削液やセメントミルク等が逆流してしまうこと
のない程度の密閉構造からなるようにすべきである。As described above, the milk injection portion is a portion that performs another function of the excavation drive shaft portion. The milk injection portion is formed in a pipe shape so as to supply drilling fluid or cement milk to the tip of the auger head. Even in the case of a flexible structure, it must be configured so that the drilling fluid or cement milk does not flow out from the removable structure, and external pressure is applied to the tip of the auger head and the removable structure. In some cases, the sealing structure should be such that the drilling liquid, cement milk, and the like do not flow backward.

【００１９】オーガヘッドは、地面を掘削すると共に、
掘削した土砂や掘削液等を上昇、排出させる機能を果た
すものであって、いうまでもなく地殻を掘削するに充分
な強度を確保したものとしなければならず、連続した螺
旋翼、回転軸心に直交状となる板状であって、螺旋状配
置とした板翼、あるいはそれらの組合せからなる複数枚
の翼等、掘削駆動軸部外周面に掘削翼を配した構造のも
のであって、回転駆動して地殻を所定直径に確実に掘削
できるよう、回転翼の先端側には掘削用の爪や刃を設け
たものとする外、翼部自体あるいは掘削駆動軸部への取
着部には、必要に応じて補強構造を取り入れたものとす
ることができる。The auger head excavates the ground,
It has the function of raising and discharging excavated earth and sand, drilling liquid, etc., and of course must have sufficient strength to excavate the crust. It is a plate-like shape that is orthogonal to the plate-shaped blades in a spiral arrangement, or a plurality of blades made of a combination thereof, such as a structure in which the drilling blades are arranged on the outer peripheral surface of the drilling drive shaft portion, In order to ensure that the earth's crust can be excavated to a predetermined diameter by rotating the excavator, excavation claws and blades should be provided on the tip side of the impeller, as well as on the wing itself or the attachment to the excavation drive shaft. May incorporate a reinforcement structure as needed.

【００２０】押撫縁付き翼体部は、回転駆動して土砂お
よび掘削液等を掘削孔壁面に擦りつけて杭孔壁面に圧
縮、塗着状とする機能を果たすものであって、掘削駆動
軸部の平断面で軸心を通る直線状配置となるよう突出す
る形状としなければならず、平断面で同翼体部と直交状
となる掘削駆動軸部側面はそのままにして、掘削孔中
に、掘削された土砂および掘削液等を受入れ可能な空間
部分が確保され、同空間部分に十分な土砂および掘削液
等を抱えたまま回転することにより、それら土砂および
掘削液等が杭孔壁面に圧縮、撫着状とされていくように
するものであり、その上下長寸法を適宜設定して、掘削
中に上昇、排出される土砂や掘削液等を同翼体部上側の
掘削孔中に留めるよう構成することも可能であって、そ
の上下寸法を掘削する孔深さの略１／２〜２／３程度の
範囲内に止まるようにしたものとするのが望ましく、そ
れらの範囲内において全長を長い方に設定すれば、土砂
や掘削液を掘削孔壁面に塗着する作用を高めることがで
き、また、全長寸法を短くすれば、より多くの量の土砂
や掘削液を、翼体部よりも上方側の掘削孔内に留め置
き、杭孔周辺の地上部への土砂や掘削液等の溢出量を少
なくできる作用が期待できることから、ボーリング箇所
の地質や使用掘削液等との兼ね合いから、杭孔全長に対
する最適な寸法範囲のものが選択、採用されるようにす
べきである。以下では、図面に示すこの発明を代表する
実施例と共に、その構造について詳述することとする。The wing body portion with a stroked edge has a function of rotating and driving to rub earth and sand and a drilling liquid or the like against the wall surface of the drill hole to compress and apply the same to the wall surface of the pile hole. The excavation drive shaft side, which is orthogonal to the wing body part in the plane cross section, should be protruded so as to form a linear arrangement passing through the axis in the plane cross section of the part. A space is secured to receive the excavated soil and drilling fluid, etc., and the soil and drilling fluid etc. rotate on the pile hole wall by rotating while holding sufficient soil and drilling fluid in the space. It is designed to be compressed and stroked, and its vertical length is set appropriately, so that earth and sand, drilling liquid, etc., which are raised and discharged during excavation, are placed in the drilling hole on the upper part of the wing body It can also be configured to hold, excavating its top and bottom dimensions It is desirable that the depth should be kept within a range of about 1/2 to 2/3 of the depth. If the total length is set to be longer in those ranges, the earth and sand or the drilling liquid is deposited on the wall surface of the borehole. The effect of spreading can be enhanced, and if the overall length is shortened, a larger amount of earth and sand or drilling fluid is retained in the drilling hole above the wing, and the ground part around the pile hole It is expected that the effect of reducing the amount of spillage of earth and sand and drilling fluid into the soil can be expected, so that the one with the optimal size range for the entire length of the pile hole should be selected and adopted in consideration of the geology of the boring location and the used drilling fluid. Should be. In the following, the structure of the present invention will be described in detail, together with the embodiment shown in the drawings.

【００２１】[0021]

【実施例】図１のオーガを分解した状態の斜視図、図２
のオーガヘッドの補強構造の正面図、および図３の掘削
孔の穿孔状態の平面図に示される事例は、押撫縁付き翼
体部とオーガヘッドとの間に着脱自在構造を設け、複数
に分解可能になるようにした、この発明の基本的構成か
らなるプレボーリング工法に使用するオーガにおける代
表的な一実施例を示すものであって、当該オーガは、掘
削駆動軸部の上側部を形成する連結用ロッド１、同連結
用ロッド１の下端に着脱自在構造２を介して連結する押
撫縁付き翼体部３，３、および同押撫縁付き翼体部３，
３の下端に着脱自在構造２を介して着脱可能となるよう
にしたオーガヘッドの掘削駆動軸部４を有するものであ
る。1 is an exploded perspective view of the auger shown in FIG. 1, and FIG.
In the case shown in the front view of the reinforcing structure of the auger head and the plan view of the drilling hole in FIG. 3 in the drilled state, a detachable structure is provided between the wing body portion with the stroked edge and the auger head, and disassembled into a plurality. 1 shows an exemplary embodiment of an auger used in a pre-boring method having the basic configuration of the present invention, which enables the auger to form an upper portion of a drilling drive shaft portion. Connecting rod 1, winged body parts 3, 3 with stroked edges connected to the lower end of connection rod 1 via detachable structure 2, and winged body parts 3 with stroked edges
The lower end 3 has an excavating drive shaft portion 4 of an auger head which is made detachable via a detachable structure 2.

【００２２】連結用ロッド１は、外径寸法が２００ｍｍ
前後（この寸法は、杭孔の径と深さとによって変わ
る。）に設定され、押撫縁付き翼体部３，３ならびにオ
ーガヘッドの夫々よりも外径寸法が小さな円柱状に形成
され、その上端部には、図示しない杭打機のリーダに装
備したオーガモータに対して着脱可能に連結する着脱自
在構造２の一方側を形成したものとなっており、その形
状が、同心状に位置して円柱状に突出され、外周壁面に
は上下軸心に直交状となる水平円柱形の凹欠状係着部２
２の一対を平行状に形成した嵌入用突部２１を設け、ま
た、同下端部には、押撫縁付き翼体部３，３を突設する
掘削駆動軸部の上端部が接続される円柱状の嵌入用穴部
２３が形成され、同嵌入用穴部２３を側方から貫通する
一対の平行なピン挿入孔２４，２４を穿孔したものと
し、更に、掘削駆動軸部の中心部分には、上下端に渡っ
て貫通するミルク注入部５を穿孔したものとなってい
る。The connecting rod 1 has an outer diameter of 200 mm.
It is set to the front and rear (this size varies depending on the diameter and depth of the pile hole), and is formed in a cylindrical shape having an outer diameter smaller than that of each of the wing body portions 3 and 3 with the stroked edge and the auger head. The part is formed with one side of a detachable structure 2 that is detachably connected to an auger motor mounted on a leader of a pile driver (not shown), the shape of which is concentrically located in a circle. A horizontal columnar concave notch engaging portion 2 which is projected in a columnar shape and is formed on the outer peripheral wall surface in a direction perpendicular to the vertical axis.
2 is provided with a fitting protrusion 21 formed in a parallel shape, and a lower end thereof is connected to an upper end of a digging drive shaft portion that protrudes the wing body portions 3 and 3 with stroked edges. A column-shaped insertion hole 23 is formed, and a pair of parallel pin insertion holes 24, 24 penetrating the insertion hole 23 from the side is formed. , A milk injection part 5 penetrating over the upper and lower ends.

【００２３】また、連結用ロッド１の下端に連結される
押撫縁付き翼体部３，３は、掘削駆動軸部となる円柱状
に形成された基杆部３１（先の連結用ロッド１に相当す
る部分）の外周縁部の中、平断面で軸心を通る直線状配
置となる周壁面から頂点部を接線状に平面化した三角形
状、あるいは上底寸法を小さくした台形状となるよう平
板を組み合わせた一対の突部として形成し、上下方向に
渡り、同一平断面形状となる翼形状を形成したものであ
って、平面形両端部間の寸法Ｆを凡そ４５０ｍｍに設定
したものであり、同上端中央部には、連結用ロッド１の
下端に形成された嵌入用孔部２３に連結すると共に、同
連結用ロッド１のピン挿入孔２４，２４に対応する外周
壁面部分に、凹欠状係着部２２，２２を形成した円柱状
の嵌入用突部２１を設ける一方、下端部には、オーガヘ
ッド４の嵌入用突部２１を嵌合可能とする嵌入用孔部２
３、およびピン挿入孔２４，２４を形成したものとなっ
ており、当該基杆部３１の上下端に渡る中心部には、前
記連結用ロッド１と同様のミルク注入部５が穿孔されて
いる。Further, the wings 3, 3 having a stroked edge connected to the lower end of the connecting rod 1 have a columnar base rod 31 (to be connected to the connecting rod 1) which serves as an excavation drive shaft. (Corresponding part), a triangular shape in which the vertex portion is tangentially planarized from the peripheral wall surface which is a linear arrangement passing through the axis in a flat cross section, or a trapezoidal shape in which the upper base dimension is reduced. It is formed as a pair of projecting portions formed by combining flat plates, and forms a wing shape having the same flat cross-sectional shape in the vertical direction, and the dimension F between both ends of the flat shape is set to about 450 mm. The central portion of the upper end is connected to a fitting hole 23 formed at the lower end of the connecting rod 1, and the outer peripheral wall portion corresponding to the pin insertion holes 24, 24 of the connecting rod 1 is recessed. Column-shaped fitting projections 21 each having a shape engagement portion 22, 22 Provided one, the lower end, the fitting hole portion 2 which can be fitted a fitting protruding portion 21 of the auger head 4
3, and a pin insertion hole 24, 24, and a milk injection part 5 similar to the connection rod 1 is drilled at the center of the base rod part 31 across the upper and lower ends. .

【００２４】更に、押撫縁付き翼体部３，３の下側に連
結されるオーガヘッドは、その掘削駆動軸部４の中央上
端部に、押撫縁付き翼体部３，３基杆部３１の嵌入用穴
部２３に嵌合し、ピン挿入孔２４，２４に挿入される連
結用ピン２５，２５に係合する凹欠状係着部２２，２２
を有する嵌合用突部２１を突設したものとなっており、
押撫縁付き翼体部３，３の嵌入用穴部２３、ピン挿入孔
２４，２４および当該オーガヘッド４の嵌入用突部２
１、凹欠状係着部２２ならびに連結用ピン２５，２５に
よって着脱自在構造２を形成している。Further, the auger head connected to the lower side of the winged body portions 3 and 3 with a stroked edge is provided at the upper end of the center of the excavation drive shaft portion 4 with the winged body portions 3 and 3 base rod portions 31 with a stroked edge. Recessed engaging portions 22, 22 which are fitted into the fitting holes 23 of the bosses and engage the connecting pins 25, 25 inserted into the pin insertion holes 24, 24.
The fitting projection 21 having a projection is provided.
The hole 23 for insertion of the wing body portions 3 and 3 with the stroked edge, the pin insertion holes 24 and 24, and the projection 2 for insertion of the auger head 4
1. The detachable structure 2 is formed by the notch-shaped engaging portion 22 and the connecting pins 25, 25.

【００２５】一方、オーガヘッド掘削駆動軸部４の上下
に渡る中心部には、前記連結用ロッド１および押撫縁付
き翼体部３，３基杆部３１同様に、ミルク注入部５を穿
孔し、また、同オーガヘッド掘削駆動軸部４の外周部に
は、軸心周りに螺旋状となり外径寸法Ｅが５００ｍｍ前
後となる螺旋翼部４１が上下に渡り突設されており、同
螺旋状翼部４１の最も下端となる縁部には、地殻の掘削
を行う複数本の掘削用爪部４２，４２，……が突設さ
れ、螺旋翼部４１の下側面には、図２中に示すように、
側断面の一部または全てが、螺旋翼部４１を底辺とする
三角形を形成するような一組、あるいは複数組の補強板
４３，４３を結合して補強されたものとなっており、結
合する各部の取付け角度は、同図中の角度Ａが５０度、
角度Ｂが３５度、角度Ｃが９８度、角度Ｄが４７度とな
るよう設定されており、更にまた、図３中に示すよう
に、オーガヘッド掘削駆動軸部４の螺旋翼部４１の平面
外径寸法Ｅは、押撫縁付き翼体部３，３の外径寸法Ｆよ
りも僅かに大きく設定したものとして形成され、前記オ
ーガヘッド掘削駆動軸部４先端から押撫縁付き翼体部
３，３の基端側までの上下寸法が、１０メートルの深さ
の穴を掘削する場合を想定し、凡そ５〜７メートルとな
るように設定したものとなっている。なお、オーガヘッ
ド掘削駆動軸部４の螺旋翼部４１の一部外周側には、図
示しない折り畳み構造、あるいは伸縮構造を設け、翼部
４１を径方向外側に向けて展開あるいは伸長可能に構成
し、拡大根固めに対応可能なものとすることもできる。On the other hand, a milk injection part 5 is pierced in the center part of the auger head excavation drive shaft part 4 in the vertical direction, similarly to the connection rod 1 and the wing body parts 3 and 3 base rod parts 31 with stroked edges. In addition, a spiral wing portion 41 having a spiral shape around the axis and having an outer diameter dimension of about 500 mm is protruded vertically from the outer peripheral portion of the auger head excavation drive shaft portion 4. At the lowermost edge of the wing 41, a plurality of excavating claws 42, 42,... For excavating the crust are protruded, and the lower surface of the spiral wing 41 in FIG. As shown,
A part or all of the side cross section is reinforced by connecting one set or a plurality of sets of reinforcing plates 43, 43 so as to form a triangle having the spiral wing 41 as a base. As for the mounting angle of each part, the angle A in FIG.
The angle B is set to 35 degrees, the angle C is set to 98 degrees, and the angle D is set to 47 degrees. Further, as shown in FIG. 3, the plane of the spiral wing 41 of the auger head excavation drive shaft 4 is formed. The outer diameter dimension E is formed so as to be slightly larger than the outer diameter dimension F of the wing body parts 3 with a stroked edge. The vertical dimension up to the base end of No. 3 is set to be approximately 5 to 7 meters, assuming a case where a hole having a depth of 10 meters is excavated. A foldable structure or a telescopic structure (not shown) is provided on a part of the outer peripheral side of the spiral wing portion 41 of the auger head excavation drive shaft portion 4 so that the wing portion 41 can be expanded or extended radially outward. In addition, it is possible to make it possible to cope with an expanded consolidation.

【００２６】[0026]

【作用】以上のとおりの構成からなるこの発明のプレボ
ーリング工法に使用するオーガは、連結用ロッド１、押
撫縁付き翼体部３，３の基杆部３１およびオーガヘッド
掘削駆動軸部４の夫々を、着脱自在構造２，２で着脱す
ることが可能であり、押撫縁付き翼体部３，３の基杆部
３１上端に突設された嵌入用突部２１を、杭打機のリー
ダに装備したオーガモータに連結した連結用ロッド１下
端の嵌入用穴部２３に嵌入し、各ピン挿入孔２４，２４
に連結用ピン２５，２５を挿入して互いが回転しないよ
う連結し、これと同様に押撫縁付き翼体部３，３基杆部
３１の下端に設けられた嵌入用穴部２３に、オーガヘッ
ド４の上端に突設した嵌入用突部２１を嵌入し、ピン挿
入孔２４，２４の夫々に、連結用ピン２５，２５を挿入
して回転せぬよう連結するものであり、また、夫々の着
脱自在構造２，２の連結用ピン２５，２５，……をピン
挿入孔２４，２４，……から抜き取ることにより、連結
用ロッド１、押撫縁付き翼体部３，３およびオーガヘッ
ドの夫々を分解、離脱することができる。The auger to be used in the pre-boring method of the present invention having the above-mentioned construction is composed of the connecting rod 1, the base rod 31 of the wings 3, 3 having the stroked edge, and the auger head excavating drive shaft 4. Each of them can be attached and detached by the detachable structures 2 and 2, and the fitting projection 21 projecting from the upper end of the base rod portion 31 of the wing body portions 3 and 3 with stroked edges is attached to the leader of the pile driver. Into the fitting hole 23 at the lower end of the connecting rod 1 connected to the auger motor mounted on the
In the same manner, the auger is inserted into the fitting hole 23 provided at the lower end of the wing body part 3 with the stroked edge and the three base rod part 31 by inserting the connecting pins 25 and 25 into each other so as not to rotate. The fitting projection 21 projecting from the upper end of the head 4 is fitted, and the connecting pins 25, 25 are inserted into the pin insertion holes 24, 24 and connected so as not to rotate, respectively. By pulling out the connecting pins 25, 25,... Of the detachable structures 2, 2 from the pin insertion holes 24, 24,. Each can be disassembled and separated.

【００２７】連結用ロッド１、押撫縁付き翼体部３，３
基杆部３１およびオーガヘッド掘削駆動軸部４を、各着
脱自在構造２，２で連結して形成された一本のオーガ
は、図４の掘削工程のオーガを示す平面図、および図５
の掘削工程のオーガを示す正面図に示されるように、杭
打機のリーダに装備したオーガモータに連結され、地面
に対して略垂直状となるよう吊下げ、配置され、同リー
ダの回転駆動力を受けて、図中の矢印方向のように正回
転し、オーガヘッドの掘削用爪部４２，４２，……が地
面を掘削して行き、同時にミルク注入部５を通じて掘削
液もしくはセメントミルクをオーガヘッド掘削駆動軸部
４の先端側に圧送、供給し、同掘削液もしくはセメント
ミルクの噴出力も利用しながら掘削を進めていく。Connecting rod 1, wing body part 3 with stroked edge
One auger formed by connecting the base rod portion 31 and the auger head excavation drive shaft portion 4 with the detachable structures 2 and 2 is a plan view showing the auger in the excavation process of FIG. 4 and FIG.
As shown in the front view showing the auger of the excavation process, it is connected to the auger motor mounted on the leader of the pile driver, suspended and arranged so as to be substantially perpendicular to the ground, and the rotational driving force of the leader In response, the auger claw portions 42, 42,... Of the auger head excavate the ground in the forward direction as indicated by the arrow in the figure, and at the same time, the drilling liquid or cement milk is auged through the milk injection portion 5. Excavation is carried out by feeding and supplying to the tip side of the head excavation drive shaft portion 4 and using the jetting power of the excavating liquid or cement milk.

【００２８】掘削用爪部４２，４２，……で掻き崩され
た土砂や、これに混練状となった掘削液またはセメント
ミルク７は、オーガヘッドの螺旋翼部４１の回転にとも
ない上昇、移動され、次第に押撫縁付き翼体部３，３側
へと移動し、同押撫縁付き翼体部３，３の位置まで上昇
していき、図４の平面図に示されるように、同一平面内
の押撫縁付き翼体部３，３の無い位置に形成される掘削
孔６内側空間部６１内に溜まった状態となった土砂およ
び掘削液等７を、回転する押撫縁付き翼体部３，３の押
撫縁が掘削孔６の内壁面に擦り付け、孔壁面に押圧、塗
着状として掘削孔６の壁面に壁塗りしたような状態に形
成していくことができる。The earth and sand scraped off by the excavating claws 42, 42 and the excavated liquid or cement milk 7 kneaded with the excavated nails rise and move with the rotation of the spiral wing 41 of the auger head. Then, it gradually moves to the side of the wing body part 3 with a stroked edge and rises to the position of the wing body part 3 with the stroked edge, as shown in the plan view of FIG. The earth and sand and the drilling liquid 7 which have accumulated in the inner space portion 61 of the excavation hole 6 formed at a position where the wing body portions 3 and 3 have no stroked edge are rotated. The rubbing edge of No. 3 rubs against the inner wall surface of the excavation hole 6, presses against the wall surface of the hole, and can be formed in a state where the wall surface of the excavation hole 6 is painted as a coating.

【００２９】また、当該オーガの押撫縁付き翼体部３，
３上端からオーガヘッド下端までの上下長寸法は５〜７
メートルと、穿孔する掘削孔６の深さ寸法１０メートル
よりも短く設定されているので、掘削中に上昇、排出さ
れる土砂および掘削液等７が、掘削孔６内に位置する押
撫縁付き翼体部３，３の上端側に周り込み、連結ロッド
１と掘削孔６内壁との間に形成される内側空間部６１中
に留められることとなる。Further, the wing body 3 with the stroked edge of the auger concerned,
3 The vertical length from the upper end to the lower end of the auger head is 5-7
Meters and the depth dimension of the drilling hole 6 to be drilled is set to be shorter than 10 meters. It goes around the upper end side of the body parts 3 and 3 and is fixed in the inner space part 61 formed between the connecting rod 1 and the inner wall of the excavation hole 6.

【００３０】前記オーガを使用したプレボーリング工法
の一例を、一連の工程に従って更に具体的に示せば、図
６の掘削を開始したオーガ要部の正面図に示されるよう
に、正回転するオーガは、先端側から掘削液を放出しな
がら地面を掘削して行き、図７のオーガが掘削孔を穿孔
する状態の正面図のように、掘削した土砂および掘削液
等７をオーガヘッドが上昇、排出し、それら上昇した土
砂および掘削液等７は、押撫縁付き翼体部３，３の押撫
縁によって掘削孔６壁面に圧縮、塗り付け状とされて同
掘削孔６の内壁面を強化しながら、既成杭８を打ち込む
に充分な深さまで掘削孔６を穿孔して行く。An example of the pre-boring method using the auger will be described in more detail according to a series of steps. As shown in the front view of the main part of the auger that started excavation in FIG. Then, as shown in the front view of the state where the auger drills a drill hole in FIG. 7, the auger head raises and discharges the excavated earth and sand and the drilling liquid 7 as shown in FIG. Then, the raised earth and sand and the excavating liquid 7 are compressed and painted on the wall surface of the excavation hole 6 by the stroking edges of the wing body portions 3 and 3 with the stroking edge, and the inner wall surface of the drilling hole 6 is strengthened. While drilling, the excavation hole 6 is drilled to a depth sufficient to drive the existing pile 8.

【００３１】なお、この実施例のものでは、押撫縁付き
翼体部３，３の外径寸法Ｆが、オーガヘッドの外径寸法
Ｅよりも僅かに（片側２０〜３０ミリメートル程度）小
さい寸法に設定されていて、押撫縁付き翼体部３，３の
先端部と掘削孔６の壁面との間に土砂および掘削液等７
が流入し易く、より多くの土砂を強く擦り付けることが
できるようにしてあり、掘削された掘削孔６の内壁面を
より一層強固なものとなるようにした掘削を進めること
が可能になる。なお、掘削孔６内壁面に塗着することな
く空間部内に残された土砂および掘削液等７は、更に、
押撫縁付き翼体部３，３の上側まで上昇していき、連結
用ロッド１と掘削孔６壁面との間に形成された内側空間
部６１内に達する。In this embodiment, the outer diameter dimension F of the wing body portions 3 and 3 with the stroked edges is slightly smaller (about 20 to 30 mm on one side) than the outer diameter dimension E of the auger head. It is set between the tip of the wing body part 3 with a stroked edge and the wall surface of the drilling hole 6, such as earth and sand and drilling fluid 7.
Is easy to flow in, so that more earth and sand can be strongly rubbed, and it becomes possible to advance the excavation in which the inner wall surface of the excavated hole 6 is further strengthened. The soil 7 and the drilling fluid 7 remaining in the space without being applied to the inner wall surface of the drilling hole 6 further
It rises to the upper side of the wing body parts 3 and 3 with the stroked edge, and reaches the inside space 61 formed between the connecting rod 1 and the wall surface of the excavation hole 6.

【００３２】図示にはしていないが、拡大根固めを行う
必要がある場合には、予めオーガヘッドの翼部４１が径
方向外側に向けて展開あるいは伸長可能となるようにし
たものを装着、使用するようにした上、所定箇所にまで
掘削が達した段階で当該オーガヘッドの翼部４１を径方
向外側に向けて展開あるいは伸長した状態で再び回転駆
動し、更に根固めする範囲の掘削を進め、所定上下範囲
に渡って拡大根固め用の掘削孔空間を形成し終えた後、
展開あるいは伸長していた翼部４１を折り畳みあるいは
縮小してしまうようにする。Although not shown, when it is necessary to carry out the expanded compaction, a wing 41 of the auger head is mounted in advance so that it can be expanded or extended radially outward. After the excavation has reached the predetermined location, the auger head 41 is rotated and driven again in a state where the wing portion 41 is expanded or extended radially outward, and the excavation in the range for further consolidation is performed. After proceeding, and after forming the drill hole space for expanding root consolidation over the predetermined upper and lower range,
The expanded or expanded wing portion 41 is folded or reduced.

【００３３】所望する深さまでの掘削を終えた後、ミル
ク注入部５を通じて根固め液となるセメントミルクを充
分な量注入してから、図８の正面図のように、オーガを
逆転駆動しながら引き上げていくと、逆転するオーガヘ
ッド翼部４１は、押撫縁付き翼体部３，３の上方側へ上
昇させていた土砂や掘削液等７を、今度は逆にオーガヘ
ッドの下方側に圧送するような状態となってオーガ全体
に上方側への推進力として作用しながら、その外周縁
で、既に壁塗り状とした掘削孔６内周壁を削りとってし
まう虞もなく、螺旋状の溝を刻設するようにして上昇し
ていき、図９のオーガを掘削孔から抜き出す状態の正面
図に示すように、オーガを完全に掘削孔６から抜き去
り、その後、引き続いて、図１０の既成杭を打ち込む状
態の正面図、および図１１の既成杭の埋設を略完了した
状態の正面図に示すように、別途準備した既成杭８を掘
削孔６中に垂直を保つように埋設し、同既成杭８が根固
め液と一体となって地盤に支持される杭打ち作業を完了
する。After the excavation to the desired depth is completed, a sufficient amount of cement milk, which is a consolidation liquid, is injected through the milk injection section 5, and then the auger is driven in reverse as shown in the front view of FIG. When lifted, the auger head wing portion 41 which rotates reversely pumps the soil 7 and the drilling liquid 7 which have been raised to the upper side of the wing body portions 3, 3 with the stroked edge, to the lower side of the auger head. As a result, there is no danger that the inner peripheral wall of the excavation hole 6 which has already been painted is cut off at the outer peripheral edge of the auger while acting as an upward propulsive force on the entire auger. As shown in the front view of the state in which the auger is extracted from the drill hole in FIG. 9, the auger is completely removed from the drill hole 6, and subsequently, the auger shown in FIG. Front view and figure of driving pile As shown in the front view of the state in which the burying of the existing pile 1 is almost completed, the separately prepared existing pile 8 is buried in the excavation hole 6 so as to be kept vertical, and the existing pile 8 is integrated with the root compaction liquid. The pile driving work supported by the ground is completed.

【００３４】[0034]

【効果】以上のとおり、この発明のプレボーリング工法
によれば、掘削孔の周壁面に土砂、掘削液、セメントミ
ルク等が押撫縁付き翼体部によって所定厚に圧縮、塗着
状とされ、強化されるので、掘削作業中は勿論のこと、
掘削を終了してオーガを抜き取る際にも掘削孔の崩壊を
確実に阻止することができ、既成杭の建て込み作業を極
めて円滑に実施可能にし、全体として杭打ち工事を大幅
に効率化することができるものになると共に、一対の押
撫縁付き翼体部は螺旋翼を有せず、しかも平断面直線状
配置に規制して形成され、オーガヘッドによって先掘さ
れる杭孔断面に占める割合が少なくなることから、掘削
中にオーガヘッドの回転で押し上げられてくる土砂、掘
削液およびセメントミルク等は、掘削孔中に留まり、掘
削孔地上部周囲に溢れ出すことを殆ど防止できるものに
なり、その割合は、従前からの平断面四角形状のオーガ
使用の場合に比較しても、遥かに少ないものに抑えるこ
とができ、その結果、基礎工事中の足場の軟弱化を確実
に阻止し、杭打機や工事車両の移動、作業者の歩行等に
支障がなくなり、作業の効率化と高い安全とを確保する
ことができる上、何よりも、杭打ち作業現場周辺に対す
る騒音公害およびヘドロ公害対策上においても極めて有
利なものとなって、市街地ならびにその周辺における杭
打ち工法として最適なものになるという秀れた特徴を発
揮するものである。As described above, according to the pre-boring method of the present invention, earth and sand, drilling liquid, cement milk, etc. are compressed and painted to a predetermined thickness by the wing body with a stroked edge on the peripheral wall surface of the drilling hole, So it ’s strengthened, not only during drilling,
Even when the auger is removed after the excavation, the collapse of the excavation hole can be reliably prevented, and the work of setting up existing piles can be carried out extremely smoothly, and the efficiency of pile driving work as a whole will be greatly improved. In addition, the pair of winged wings has no spiral wing, and is formed in a linear arrangement in a flat cross section. Since it becomes less, the earth and sand, drilling fluid, cement milk, etc., which are pushed up by the rotation of the auger head during drilling, can remain in the drilling hole and can almost be prevented from overflowing around the ground portion of the drilling hole, The ratio can be reduced to a much smaller value than in the case of using augers with a rectangular cross section in the past, and as a result, the softening of the scaffold during foundation work is reliably prevented, and Hammer There is no hindrance to the movement of construction vehicles, walking of workers, etc., which makes it possible to ensure efficient work and high safety, and, above all, is extremely effective in noise and sludge pollution control around the pile driving work site. It is advantageous and exhibits the excellent feature of being the most suitable pile driving method in and around the city.

【００３５】しかも、この発明のプレーボーリング工法
に使用するオーガによれば、汎用型の従前からの杭打機
を殆どそのまま使用可能になると共に、その操作性につ
いても、従前からのスパイラルオーガ等と略同様にして
行うことにより、掘削した土砂、掘削液、セメントミル
ク等の掘削孔からの溢れ出しを極力防止し、掘削孔周壁
面の強化が可能になる上、押撫縁付き翼体部と掘削孔壁
面との間に上下方向に連通する大きな空間部が形成され
ていてオーガ下方側の杭孔を密閉状としてオーガ引き抜
きに支障を来す状態に陥ることが全くなく、逆転操作す
ることによって円滑な抜き去りができるものとなること
から、正確で安定した基礎工事を実現可能にするという
秀れた特徴も得られることになる。In addition, according to the auger used in the play boring method of the present invention, a general-purpose conventional pile driving machine can be used almost as it is, and the operability of the conventional pile driving machine is the same as that of a conventional spiral auger. By carrying out in substantially the same manner, it is possible to prevent excavated earth and sand, drilling fluid, cement milk, etc. from overflowing from the drilling hole as much as possible and to strengthen the peripheral wall surface of the drilling hole. A large space communicating vertically with the hole wall is formed, and the pile hole on the lower side of the auger is sealed so that there is no obstacle to pulling out the auger. Since it can be easily removed, it also has the excellent feature of enabling accurate and stable foundation work.

【００３６】また、掘削中に所定深さまで達した段階
に、予め折り畳まれるか、あるいは縮小されていたオー
ガヘッドの翼部を展開あるいは伸長させて掘削を継続す
るようにしたものでは、掘削孔径を拡大し、セメントミ
ルクを注入して拡大根固めし、オーガを抜き去る際に、
オーガヘッドの翼部を再度折り畳むか、あるいは縮小す
るものとすれば、拡大根固めする基礎工事の際にも、前
述のように安全で効率的な施工を行うことができるもの
とすることができる。Further, when the excavation is continued by expanding or extending the wing portion of the auger head that has been folded or reduced in advance when the excavation reaches a predetermined depth during excavation, the diameter of the excavation hole is reduced. When enlarging, injecting cement milk and expanding the roots, when removing the auger,
If the wings of the auger head are folded or reduced again, it is possible to perform safe and efficient construction as described above even during foundation work to expand and consolidate .

【００３７】特に、実施例に説明したオーガは、上記ま
での特徴に加え、一対の押撫縁付き翼体部３，３の押撫
縁間の外径寸法Ｆが、オーガヘッドの外径寸法Ｅよりも
小さい寸法に設定したものとしてあって、押撫縁付き翼
体部３，３の先端部と掘削孔６の壁面との間に土砂およ
び掘削液等７が流入し易く、確実に土砂を擦り付け、杭
孔周壁面の強化により有利な構造のものに形成されると
共に、形成すべき杭孔深さに対して１／２〜２／３程度
の上下長寸法の押撫縁付き翼体部３，３を採用するよう
にしていて、オーガヘッドの回転で押し上げられる土
砂、掘削液、セメントミルク等７を、押撫縁付き翼体部
３，３の上側に周り込み易くなるようにし、その殆どを
掘削孔６内の内側空間部６１に留められるようにしてあ
ることから、掘削孔６から溢れ出す土砂や掘削液等７の
量を、従前までのアースオーガや穿孔機に比較して凡そ
１／１０程度に抑えることができるという有利な効果が
得られるものとなっている。In particular, in the auger described in the embodiment, in addition to the above-described features, the outer diameter F between the stroking edges of the pair of stroking wings 3, 3 is set to be equal to the outer diameter E of the auger head. It is assumed that the size is set smaller than that of the wings 3, 3 with the stroked edge and the excavation fluid 7 easily flows between the tip of the wing body 3, 3 and the wall surface of the excavation hole 6, so that the earth and sand are surely rubbed. A wing body with a stroked edge having a vertically long dimension of about 1/2 to 2/3 with respect to the depth of the pile hole to be formed, 3 so that the earth and sand, drilling liquid, cement milk, etc., which are pushed up by the rotation of the auger head, can easily flow around the upper side of the wing body portions 3 and 3 with the rubbing edges, and most of them are excavated. Since it is designed to be fixed to the inner space 61 in the hole 6, the drilling hole The amount of sediment and the drilling fluid or the like 7 overflowing from the, has become what is advantageous effect can be suppressed to about 1/10 approximately compared to the earth auger and the drilling machine to the previous obtained.

【００３８】叙述の如く、この発明のプレボーリング工
法、およびそれに使用するオーガは、その新規な構成に
よって所期の目的を遍く達成可能とするものであり、し
かも押撫縁付き翼体部の形状、構造が簡素であって製造
も容易で、全長に渡って螺旋翼形状を有する従前から汎
用のアースオーガに比較しても遥かに経済的なものとす
ることができる上、取扱い操作性についても着脱自在構
造を取り入れ、搬送や保管に有利なものとなって、基礎
工事の作業効率を大幅に高めることができるものになる
ことから、費用の削減と工期の短縮とを確実に達成可能
にすると同時に、低振動および低騒音、ヘドロ対策等の
面でも十分な効果が期待できものであって、厳しい経済
情勢から、より一層のコスト削減と作業の効率化、安全
性とが要求される建設業界業界において高く評価され、
広範に渡って利用、普及していくものと予想される。As described above, the pre-boring method of the present invention and the auger to be used for the same are intended to achieve the intended purpose uniformly by the novel structure. The structure is simple and easy to manufacture. It has a spiral wing shape over the entire length, making it much more economical than conventional earth augers, and it has a detachable handling operability. Adopting a flexible structure, it is advantageous for transportation and storage, and can greatly increase the efficiency of foundation work, so it is possible to reliably reduce costs and shorten the construction period Sufficient effects can also be expected in terms of low vibration and low noise, measures against sludge, etc., and severe economic conditions require further cost reduction, work efficiency, and safety. Been highly evaluated in 設業 world industry,
It is expected to be widely used and spread.

【図面の簡単な説明】[Brief description of the drawings]

図面は、この発明のプレボーリング工法、およびそれに
使用するオーガの技術的思想を具現化した代表的な実施
例を示すものである。The drawings show a typical embodiment that embodies the technical concept of the preboring method of the present invention and the auger used therein.

【図１】オーガの分解状態を示す斜視図である。FIG. 1 is a perspective view showing an exploded state of an auger.

【図２】オーガヘッドの翼構造を示す正面図である。FIG. 2 is a front view showing a wing structure of an auger head.

【図３】掘削状態の押撫縁付き翼体部を示す平面図であ
る。FIG. 3 is a plan view showing a wing body portion with a stroked edge in an excavated state.

【図４】押撫縁付き翼体部が土砂を壁面に塗着する状態
を示す平面図である。FIG. 4 is a plan view showing a state in which a wing body portion with a stroked edge applies earth and sand to a wall surface.

【図５】掘削中のオーガを示す正面図である。FIG. 5 is a front view showing the auger being excavated.

【図６】掘削を開始したオーガの要部を示す正面図であ
る。FIG. 6 is a front view showing the main part of the auger where excavation has started.

【図７】掘削した土砂や掘削液等を上昇させるオーガを
示す正面図である。FIG. 7 is a front view showing an auger for raising excavated earth and sand, drilling liquid, and the like.

【図８】逆転駆動するオーガを示す正面図である。FIG. 8 is a front view showing an auger driven in reverse rotation.

【図９】掘削孔から抜き去るオーガを示す正面図であ
る。FIG. 9 is a front view showing an auger withdrawn from a drill hole.

【図１０】掘削孔に既成杭を埋設する状態を示す正面図
である。FIG. 10 is a front view showing a state in which an existing pile is buried in an excavation hole.

【図１１】埋設した既成杭を示す正面図である。FIG. 11 is a front view showing a buried existing pile.

【符号の説明】[Explanation of symbols]

１ 連結用ロッド ２ 着脱自在構造 ２１ 同 嵌入用突部 ２２ 同 凹欠状係着部 ２３ 同 嵌入用穴部 ２４ 同 ピン挿入孔 ２５ 同 連結用ピン ３ 押撫縁付き翼体部 ３１ 同 基杆部 ４ オーガヘッド掘削駆動軸部 ４１ 同 螺旋翼部 ４２ 同 掘削用爪部 ５ ミルク注入部 ６ 掘削孔 ６１ 同 内側空間部 ７ 土砂、掘削液、セメントミルク等 ８ 既成杭 DESCRIPTION OF SYMBOLS 1 Connecting rod 2 Detachable structure 21 Same fitting projection 22 Same concave notch engaging part 23 Same fitting hole 24 Same pin insertion hole 25 Same Connecting pin 3 Wing body part with stroked edge 31 Same base rod part Reference Signs List 4 Auger head excavation drive shaft part 41 Same spiral wing part 42 Same excavation claw 5 Milk injection part 6 Drilling hole 61 Same inner space part 7 Earth and sand, drilling liquid, cement milk, etc. 8 Prefabricated pile

Claims (8)

【特許請求の範囲】[Claims] 【請求項１】 ミルク注入部を兼用する掘削駆動軸部の
先端外側にオーガヘッドが装着されると共に、それより
上方外側所定範囲に渡り、一対の押撫縁付き翼体部が平
断面で軸心を通る直線状配置となるようにして突設、一
体化されてなるオーガを、正回転駆動しながら先端オー
ガヘッドで掘削、穿孔すると共に、該オーガヘッドによ
って上昇、排除される土砂および掘削液等を、オーガヘ
ッドと共に同心状に回転する翼体部の各押撫縁で、先行
形成されていく掘削孔壁面に擦り付けて孔壁面に圧縮、
塗着状としながら、目的深さまで掘削した後、ミルク注
入部を通じて孔底に充分な量の根固め液を注入し、続い
て、オーガを逆回転駆動しながら上昇させて掘削孔中か
ら抜き去り、別途準備された既成杭を掘削孔中に埋設す
るようにしたことを特徴とするプレボーリング工法。An auger head is mounted on the outer side of the tip of a digging drive shaft that also serves as a milk injection part, and a pair of winged wings having a flattened edge has a flat cross section over a predetermined range outside the auger head. The auger, which is protruded and integrated so as to form a linear arrangement passing through, is excavated and drilled by the tip auger head while being driven in the forward rotation, and the earth and sand, drilling fluid, etc., which are raised and eliminated by the auger head. Is rubbed against the excavation hole wall that is formed in advance by each stroked edge of the wing body part that rotates concentrically with the auger head, and is compressed on the hole wall surface,
After excavating to the target depth while applying a coating, a sufficient amount of consolidation liquid is injected into the bottom of the hole through the milk injection section, and then the auger is raised while being driven in reverse rotation to remove it from the hole. A pre-boring method, wherein a separately prepared ready-made pile is buried in a borehole. 【請求項２】 ミルク注入部を兼用する掘削駆動軸部の
先端外側にオーガヘッドが装着されると共に、それより
上方外側で、掘削する孔深さの１／２〜２／３程度の長
さ範囲に渡り、一対の押撫縁付き翼体部が平断面で軸心
を通る直線状配置となるようにして突設、一体化されて
なるオーガを、正回転駆動しながら先端オーガヘッドで
掘削、穿孔すると共に、該オーガヘッドによって上昇、
排除される土砂および掘削液等を、オーガヘッドと共に
同心状に回転する翼体部の各押撫縁で、先行形成されて
いく掘削孔壁面に擦り付けて孔壁面に圧縮、塗着状とす
る一方、それ以外の更に上方に上昇、排除される土砂お
よび掘削液等については、翼体部上端よりも上方に確保
されていく充分な容積の掘削孔内に留められ、掘削孔か
ら溢れ出してしまうことがないようにしながら、目的深
さまで掘削した後、ミルク注入部を通じて孔底に充分な
量の根固め液を注入し、続いて、オーガを逆回転駆動し
ながら上昇させて掘削孔中から抜き去り、別途準備され
た既成杭を掘削孔中に埋設するようにしたことを特徴と
するプレボーリング工法。2. An auger head is mounted on the outer end of the excavation drive shaft which also serves as a milk injection part, and has a length of about 1/2 to 2/3 of the depth of the excavation hole above and outside the auger head. Over a range, a pair of winged wings with a stroked edge protruded so as to be in a linear configuration passing through the axis in a flat cross section, and the integrated auger was excavated with the tip auger head while driving forward rotation, While piercing, raised by the auger head,
The excavated soil and drilling liquid are rubbed against the previously formed excavation hole wall surface at each stroked edge of the wing body part that rotates concentrically with the auger head, and are compressed and applied to the hole wall surface. However, any other soil, drilling liquid, etc., which rises and is removed further upwards, will be retained in the drilling hole having a sufficient volume secured above the upper end of the wing body, and will overflow from the drilling hole. After excavating to the target depth while avoiding the problem, a sufficient amount of consolidation liquid is injected into the bottom of the hole through the milk injection section, and then the auger is raised while being driven in reverse rotation to remove it from the hole. A pre-boring method in which a separately prepared ready-made pile is buried in a borehole. 【請求項３】 掘削中に所定深さまで達した段階に、予
め折り畳まれるか、あるいは縮小されていたオーガヘッ
ドの翼部を展開あるいは伸長させて正回転駆動掘削を継
続し、それまで掘削してきた掘削孔径を拡大した掘削を
しながら、目的深さまで掘削し、ミルク注入して拡大根
固めし、オーガを逆回転駆動しながら上昇させて掘削孔
中から抜き去る前の段階には、オーガヘッドの翼部を再
度折り畳むか、あるいは縮小するかするようにした、請
求項１または２何れか記載のプレボーリング工法。3. When a predetermined depth is reached during excavation, the wing portion of the auger head that has been folded or reduced in advance is expanded or extended to continue forward rotation drive excavation, and excavation has been performed up to that time. Before drilling to the target depth while drilling with the drill hole diameter expanded, injecting milk to expand the roots, raising the auger while driving the auger in reverse rotation and pulling it out of the drill hole, the auger head The pre-boring method according to claim 1 or 2, wherein the wing portion is folded or reduced again. 【請求項４】 一対の翼体部における各押撫縁間の寸法
が、オーガヘッドによって上昇、排除されてくる土砂お
よび掘削液等の掘削孔壁面への所望塗着厚に応じた分だ
け、オーガヘッドの径よりも小さく設定され、孔壁への
土砂および掘削液等の圧縮、塗着を促進しながら掘削す
るようにした、請求項１ないし３何れか記載のプレボー
リング工法。4. The dimension between each of the stroking edges of the pair of wing body portions is determined by an amount corresponding to a desired coating thickness of earth and sand, drilling fluid, and the like, which are raised and eliminated by the auger head, on the wall surface of the drilling hole. The pre-boring method according to any one of claims 1 to 3, wherein the pre-boring method is set to be smaller than the diameter of the auger head, and excavates while facilitating the compression and application of soil and drilling fluid to the hole wall. 【請求項５】 ミルク注入部を兼用する掘削駆動軸部の
先端外側に、回転軸芯を中心とする螺旋状翼部、または
複数枚に分断され、螺旋状配置とした翼部、あるいは、
掘削方向に略直交状となり、掘削面に鉤状爪部を有する
円盤状翼部、または同一平面内に属し、複数枚に分断さ
れ、掘削面に鉤状爪部を有する板状翼部等からなるオー
ガヘッドを装着すると共に、それより上方外側所定範囲
に渡り、夫々の平断面形状が、掘削する孔断面の内径に
略達する長径をもつ楕円形状、長円形状、または対角線
の中の長尺な一方を、同孔断面の内径に達するようにし
た菱形状、あるいは、頂角に丸みを付けた略三角形や台
形、将棋形等の多角形状等とした一対の押撫縁付き翼体
部を、平断面で軸心を通る直線状配置となるようにして
突設、一体化してなるものとした、請求項１ないし４何
れか記載のプレボーリグ工法に使用するオーガ。5. A helical wing centered on a rotation axis center, or a wing part divided into a plurality of pieces and helically arranged outside a tip of a digging drive shaft part also serving as a milk injection part, or
It is substantially orthogonal to the direction of excavation, from a disk-shaped wing having a hook-shaped claw on the excavation surface, or a plate-shaped wing having a hook-shaped claw on the excavation surface, belonging to the same plane and divided into a plurality of pieces. Along with the auger head, an elliptical shape, an elliptical shape, or a long shape in a diagonal line, each of which has a longer cross-sectional shape substantially reaching the inner diameter of the cross-section of the hole to be excavated over a predetermined range above and outside thereof. One of them is a rhombus shaped to reach the inner diameter of the cross section of the same hole, or a pair of winged wings with a stroked edge, such as a generally triangular or trapezoid with a rounded apex angle, a polygonal shape such as a shogi shape, 5. The auger used in the pre-borg rig method according to claim 1, wherein the auger is formed so as to be projected and integrated so as to have a linear arrangement passing through the axis in a plane cross section. 【請求項６】 ミルク注入部を兼用する掘削駆動軸部の
外側所定箇所に装着または一体化されてなるオーガヘッ
ドと一対の押撫縁付き翼体部とが、夫々対応する掘削駆
動軸部分におけるオーガヘッド側は上端と、同押撫縁付
き翼体部側は下端とにおいて着脱自在構造で連結されて
なるものとした、請求項５記載のオーガ。6. An auger head in a corresponding excavation drive shaft portion, wherein the auger head and a pair of winged wings attached to or integrated with a predetermined portion outside the excavation drive shaft portion also serving as a milk injection portion are respectively provided. 6. The auger according to claim 5, wherein the head side is connected to the upper end, and the winged body side with the stroked edge is connected to the lower end by a detachable structure. 【請求項７】 ミルク注入部を兼用する掘削駆動軸部の
外側所定箇所に一体化されてなる一対の押撫縁付き翼体
部が、その上下方向長さ寸法を、掘削する孔深さの１／
２〜２／３程度のものに規制して設定されてなるものと
し、一対の押撫縁付き翼体部よりも上方となる掘削駆動
軸部周りの掘削孔内に、オーガヘッドによって上昇、排
除される土砂および掘削液等を一時的に収容したままと
することが可能となるようにした、請求項５または６何
れか記載のオーガ。7. A pair of winged wings with a stroked edge integrally formed at a predetermined position outside a digging drive shaft also serving as a milk injection part has a length in the vertical direction which is equal to one of the depth of a hole to be digged. /
It is set to be restricted to about 2/3 and is set up and removed by the auger head into the excavation hole around the excavation drive shaft part which is above the pair of stroking wings. The auger according to claim 5, wherein the auger can temporarily store sediment, drilling fluid, and the like. 【請求項８】 一対の翼体部における各押撫縁間の寸法
が、オーガヘッドによって上昇、排除されてくる土砂お
よび掘削液等の掘削孔壁面への所望塗着厚に応じた分だ
け、オーガヘッドの径よりも小さく設定されてなるもの
とした、請求項５ないし７何れか記載のオーガ。8. The distance between each of the stroking edges of the pair of wings is determined by the desired thickness of the soil, drilling fluid, etc., which is raised and removed by the auger head, on the wall surface of the drilling hole. The auger according to any one of claims 5 to 7, wherein the auger head is set smaller than the diameter of the auger head.