JPH11247573A - Boring construction method and device of foundation ground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bore a pit hole with a firm pit peripheral-wall, in which there is no possibility of collapse, easily in a ground surely while realizing complete earth no-removal in the boring construction method and device of the foundation ground. SOLUTION: A pre-excavation edge 2 is formed to the lower section of the front end of an auger head so that an auger lever 4, in which several resistance pieces 5, 5 having constant length and edge width in the axial direction are annexed alternately on a shaft peripheral surface at mutually different spatial places at proper intervals, is connected detachably on the upper same shaft of an excavator 1, in which a screw edge piece 3 is arranged in parallel on the upper section of the pre-excavation edge 2, through a connecting washer 6.

Description

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

【０００１】[0001]

【産業上の利用分野】この発明は基礎杭打設用としての
きわめて強固な孔周壁を有した杭孔を容易確実に掘孔す
ると共に完全無排土をその主な目的と基礎地盤の施孔工
法とその装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to easily and surely excavate a pile hole having a very strong hole peripheral wall for driving a foundation pile, and to completely excavate a soil without a main purpose. It relates to the method of construction and its equipment.

【０００２】[0002]

【従来の技術】従来、建築等基礎地盤の施孔工法におい
てはスクリュー羽根により地中を回転掘孔し、該掘孔内
に杭柱を打設し強固な地盤を造成しようとする謂わゆる
スクリュー工法が主に用いられているが、該工法は単に
地盤掘削を目的とするものであるから上記、地中掘孔作
業中及び杭柱の打設前に孔壁が崩壊する等して爾後の作
業を著しく困難化とし、特に上記杭孔掘削により多量の
掘削土礫が地上に揚土しその排土処理等に問題を生じて
いた。2. Description of the Related Art Conventionally, in a drilling method for a foundation ground such as a building, a so-called so-called screw for drilling a rotary ground in the ground with screw blades and driving a pile post into the borehole to form a strong ground. Although the method of construction is mainly used, since the method of construction is intended only for excavation of the ground, the hole wall collapses during the above-mentioned underground excavation work and before the installation of the pile post, and the subsequent method is performed. The work became extremely difficult, and in particular, a large amount of excavated debris was excavated on the ground due to the above-mentioned excavation of the pile hole, causing a problem in the earth removal processing and the like.

【０００３】[0003]

【発明が解決しようとする課題】かかる欠点を解決する
ものとしてこの発明の発明者が、先にオーガヘッドの全
体形状を円錐形状に形成し、且つ該円錐形ヘッド面に圧
土縁を有したスクリュー羽根を付設し、地中掘削と同時
に該掘削土壌を上記円錐面及び圧土縁の相乗作用にて孔
周面に拡開圧締し、強固な圧密層を造成すると共に地上
への排土量を極力寡少とした特殊形状の地盤の掘孔装置
（特許第１１３６１７７号）を開発し、これが業界間に
おいては相当の好評を得ていたのであるが、更に孔壁の
土圧を利用して掘削抵抗を大とすることによってより強
固な圧密壁が造成得られることが現場の実験結果にて判
明したので上記圧土縁に代わるものとしてオーガ杆全体
形状を方型形または三角形状に形成し回転掘削時におけ
る負荷抵抗を大とする特殊な掘削兼圧土オーガ（特許１
３０８０２２号）を発明したが強固な圧密壁が容易に得
られるという反面、オーガ杆全体形状を変形に形成する
ことは円状形オーガに比してはコスト高となり、且つ地
質等の柔硬状体に応じては負荷抵抗が異なり該異常な負
荷抵抗が原因にて装置の破損、故障等が生じる等の懸念
があった。In order to solve such a drawback, the inventor of the present invention first formed the entire shape of the auger head into a conical shape, and had a pressing edge on the conical head surface. At the same time as the underground excavation, the excavated soil is expanded and clamped to the hole peripheral surface by the synergistic action of the conical surface and the consolidation edge to create a strong consolidation layer and discharge the ground to the ground. A specially shaped ground excavation device (patent No. 1136177) was developed with the minimum possible amount, and it has gained considerable reputation in the industry. The results of on-site experiments have shown that a stronger consolidation wall can be obtained by increasing the excavation resistance.Therefore, the entire auger rod was formed in a square or triangular shape as an alternative to the compacted edge. High load resistance during rotary excavation That special drilling and 圧土 auger (patent 1
No. 308022), a strong consolidation wall can be easily obtained, but deforming the entire shape of the auger rod is more expensive than a circular auger and has a soft and hard material such as geology. The load resistance differs depending on the body, and there is a concern that the abnormal load resistance may cause damage or failure of the device.

【０００４】[0004]

【課題を解決するための手段】この発明は、上記欠点に
着眼し如何なる土質にも即座に適応すべく従来の掘削負
荷抵抗を若干軽減するという反面、該負荷抵抗を有効に
利用して孔周壁面をより強固に圧締しようとするもので
あって、その概略はヘッド先端下方に先掘刃を該先掘刃
の上部にスクリュー翼片を付設せる掘進装置の上部同軸
上に、オーガ周面前後または左右面に一定の長さ及び刃
巾を有した数ケの抵抗片を長さ方向に対して適当間隔毎
に交互に付設してなるオーガ杆を連設し、かかる掘進装
置にて地盤下方の地盤を掘削拡開し地中を掘進すると同
時にオーガ杆周面に付設せる抵抗片が孔周の土圧抵抗に
抗して掘削土礫の拡開と圧締とを連続的交互に繰り返し
ながら上記掘削土礫を孔周壁に強力に圧締し，地中に強
固な孔壁面を有した杭孔を掘孔することを可能とした基
礎地盤の施孔工法とその装置を提供しようとするもので
ある。因みに、図面にてその一例を示している通りこの
発明に用いる装置は、ヘッド先端下方に先掘刃２を、該
先掘刃２の上部にスクリュー翼片３を付設せる掘進装置
１の上部同軸上に、軸方向に対して一定の長さ及び刃巾
を有した数ケの抵抗片５、５を適当間隔毎で且つ該間隔
位置が相互に異なるべく軸周面に交互に付設してなるオ
ーガ杆４を連結自在に連接すべく形成されている。即
ち、上記抵抗片５、５の付設によって積極的に孔周間に
負荷抵抗を造成し、該負荷の反動作用を利用して先に掘
削せる地盤下方の土礫を地上に揚土することなく全量を
孔周壁面に圧締し剛強な孔周壁層を有した杭孔を施孔し
ようとする。なお、この発明においては上記抵抗片５、
５の外径寸ｂが少なくとも下方に連接する掘進装置１の
スクリュー翼片３の回転軌跡ｃと稍径大径寸または同径
寸巾に形成することが望ましい。SUMMARY OF THE INVENTION The present invention focuses on the above-mentioned drawbacks and slightly reduces the conventional excavation load resistance in order to immediately adapt to any type of soil, but on the other hand, makes effective use of the load resistance to drill holes. It is intended to tighten the wall more firmly. The outline of the auger peripheral surface is on the upper coaxial side of the excavating device in which a cutting edge is attached below the tip of the head and a screw blade is attached above the cutting edge. An auger rod consisting of several resistance pieces having a fixed length and blade width alternately attached at appropriate intervals in the length direction on the front and rear or left and right surfaces is connected in series, and the ground While excavating and expanding the lower ground and digging in the ground, the resistance piece attached to the auger rod peripheral surface continuously repeats the expansion and compaction of excavated debris against the earth pressure resistance around the hole The excavated debris is strongly pressed against the peripheral wall of the hole while having a strong hole wall in the ground. It is intended to provide the possibility and the 施孔 method of foundation ground and an apparatus to Juana the Kuiana. By the way, as shown in the drawing, one example of the apparatus used in the present invention is a coaxial upper part of an excavating device 1 in which a cutting edge 2 is provided below a tip of a head and a screw blade piece 3 is provided above the cutting edge 2. A plurality of resistance pieces 5, 5 having a fixed length and a blade width in the axial direction are alternately provided on the shaft peripheral surface at appropriate intervals and at different intervals. The auger rod 4 is formed so as to be connected freely. That is, the load resistance is actively created between the hole circumferences by the attachment of the resistance pieces 5 and 5, and the debris below the ground to be excavated first by utilizing the reaction of the load is not lifted to the ground. The whole amount is pressed against the peripheral wall of the hole, and a pile hole having a strong hole peripheral wall layer is to be formed. In the present invention, the resistor piece 5
It is desirable that the outer diameter b of the screw blade 5 of the excavating device 1 is formed to have a slightly larger diameter or the same diameter as the rotation trajectory c of the screw blade piece 3 connected at least downward.

【０００５】更に、この発明においては上記負荷及び圧
締効果を高めるためにスクリュー翼片３の前後面の一部
に平坦面または切り欠け部分を形成したオーガヘッド７
をオーガ杆４に連設することによって、上記圧締作用を
より強力に行わしめることが出来得る。Further, in the present invention, an auger head 7 having a flat surface or a cut-out portion on a part of the front and rear surfaces of the screw blade piece 3 in order to enhance the above-mentioned load and compression effect.
Is connected to the auger rod 4 so that the above-mentioned pressing action can be performed more strongly.

【０００６】[0006]

【作用】以下、この装置による基礎地盤の掘孔施工例を
説明すると、先ず掘孔地盤に応じて所定形寸のオーガ杆
４と掘進装置１を選定し、同軸上に両者を一体的に連結
し、これを地盤上に定置せる杭打機に吊設する。しかる
後に動力を駆動行わしめるにおいてオーガ杆４の回転と
共に掘進装置１も回転し、先掘刃２にて地盤下方の地盤
を掘削すると同時にスクリュー翼片３の回転作用によっ
て上記地中の掘削土礫を拡開攪拌し、地中の掘進に伴っ
て該掘削土礫を上方に移動させようとするが掘進装置１
と追従するオーガ杆４面に付設せる抵抗片５、５の回転
作用によって上記掘進土礫を拡開攪乱しながら回転方向
の孔周壁面に強固に圧締圧密する。特にこの発明におい
ては、掘進時において抵抗片５、５の刃巾によっては相
当な抵抗負荷が生じると考えられるとしても、上記の如
く先に先掘刃２及びスクリュー翼片３によって土礫自体
が拡開粉砕しているがために掘進に伴って孔周面におけ
る負荷抵抗が軽減し、若干の負荷が生じるが逆に該負荷
が反動して先に掘削し上昇する土礫を交互に拡開、圧締
の作用を間歇的に繰り返しながら該掘削土礫を孔周壁に
圧締し強固な孔周壁面を有した杭孔を容易確実に掘孔す
ることが出来得るのである。しかも各抵抗片５、５間毎
に一定の間隔ａ即ち空隙が形成されているがために孔内
に残留する空気の逃げ場となりオーガ抜杆時に発生せる
空気吸引に伴う孔壁面の崩壊等の憂いを完全に阻止して
いる。この発明は上記の如く、オーガ回転時に孔周間に
積極的に軽負荷抵抗を起生し該負荷抵抗による反動を利
用して掘削土礫を孔周壁に圧締し強固に圧締された杭孔
を施孔しようとするものである。かくして施孔せる杭孔
内にオーガ抜杆時、該オーガ杆４内に配設せる充填材装
填管孔８を介してベントナイト液、モルタル等の凝結材
を充填投入してモルタル柱を造成し、該モルタル柱内に
既成杭、Ｈ鋼柱等の芯鋼を芯杭として打設行わしめるこ
とによって地中に強力な基礎杭造成地盤を容易確実に造
成求めることが出来得るのである。In the following, a description will be given of an example of drilling a foundation ground using this device. First, an auger rod 4 having a predetermined shape and a drilling device 1 are selected according to the drilling ground, and the two are integrally connected coaxially. And hang it on a pile driver that can be placed on the ground. After that, when the power is driven, the excavating device 1 also rotates together with the rotation of the auger rod 4, excavating the ground below the ground with the leading edge 2, and at the same time, the excavated debris in the ground by the rotating action of the screw blade piece 3. To expand the excavated debris with the excavation underground, but the excavation device 1
Due to the rotating action of the resistance pieces 5 and 5 attached to the surface of the auger rod 4 that follows, the excavated gravels are expanded and disturbed, and are firmly pressed against the peripheral wall surface in the rotation direction. In particular, in the present invention, even if it is considered that a considerable resistance load is generated depending on the blade width of the resistance pieces 5 and 5 at the time of excavation, the debris itself is firstly formed by the pre-digging blade 2 and the screw blade piece 3 as described above. Due to the expansion and crushing, the load resistance on the peripheral surface of the hole is reduced with the excavation, and a slight load is generated.On the contrary, the load recoils and the excavation and ascending debris are alternately expanded. In addition, the excavated debris is pressed against the peripheral wall of the hole while intermittently repeating the operation of pressing, whereby a pile hole having a strong peripheral wall of the hole can be easily and reliably bored. In addition, since a constant spacing a, that is, a gap is formed between each of the resistor pieces 5, 5, it becomes a refuge for air remaining in the hole, and the wall surface of the hole collapses due to air suction generated when the auger is pulled out. Is completely blocked. As described above, according to the present invention, a pile which is caused to generate light load resistance positively between the holes during rotation of the auger and uses the recoil caused by the load resistance to press the excavated debris against the peripheral wall of the hole and to firmly press the pile. A hole is to be formed. Thus, when the auger is pulled out into the pile hole to be bored, a condensing material such as bentonite liquid, mortar or the like is charged and charged through the filler loading tube hole 8 provided in the auger rod 4, thereby forming a mortar column. By driving a core steel such as an existing pile or an H steel column into the mortar column as a core pile, it is possible to easily and reliably obtain a strong foundation pile formation ground in the ground.

【０００７】[0007]

【実施例】この発明に係る地盤施孔装置は次の構成より
なるものであって大別して地盤を掘進する掘進装置１
と、掘削土礫を孔周壁面に圧締する抵抗片５、５を付設
したオーガ装置とによって形成されている。以下、上記
構成部分の実施例を図面について詳細に説明すると、掘
進装置１としてはヘッド全体形状が円錐形状に形成され
ているものであって、先端には一定巾寸よりなる数枚の
先掘刃２を付設すると共に該ヘッド周面に相当肉圧のス
クリュー翼片３が上下一体的に付設されている。またオ
ーガ装置は円棒型オーガロッドの円周面の前後面、また
は左右両面対面側に適当な長さ及び刃巾の抵抗片５、５
を軸方向に対して一体的に付設してなるものであって該
抵抗片５、５は適当間隔毎に空隙ｃを隔てて両側の抵抗
片５、５を配設するが、該空隙ｃの開設位置としては対
設する側の抵抗片５の空隙ｃ｀とは交互に位置すべく開
設する。また上記空隙ｃ、ｃ｀の開設に代えて抵抗片
５、５の一部を適宜の深さに凹欠して空隙を形成行わし
めることも一考であり、上記抵抗片５、５の付設数を施
孔を目的とする軟、硬地質等の関係によってオーガロッ
ドの円周面の前後面、または左右両面の複数のみに付設
することなく、三〜四辺等の箇所に適当数を付設する場
合もある。なお、上記抵抗片５、５の刃巾としては回転
時に抵抗がより強大となるものではなく、例えば杆面に
若干***した凸条片を形成したものでも良く、その外径
寸ｂが少なくとも下方に連接すべき掘進装置１のスクリ
ュー翼片３の回転軌跡ａと稍径寸大または同径寸巾に形
成する。図示中６は掘進装置１上部に付設せるオーガ杆
４との連結座金である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A ground drilling device according to the present invention has the following configuration and is roughly divided into a digging device 1 for digging a ground.
And an auger device provided with resistance pieces 5, 5 for pressing the excavated debris against the peripheral wall of the hole. Hereinafter, an embodiment of the above-mentioned components will be described in detail with reference to the drawings. As the excavating device 1, the whole head is formed in a conical shape, and several excavations having a fixed width are formed at the tip. A blade 2 is provided, and a screw blade 3 having a considerable thickness is integrally provided on the peripheral surface of the head. The auger device has resistance pieces 5 and 5 of an appropriate length and blade width on the front and rear surfaces of the circumferential surface of the circular rod type auger rod, or on both left and right facing surfaces.
Are integrally provided in the axial direction, and the resistor pieces 5 and 5 are provided with the resistor pieces 5 and 5 on both sides with an air gap c at appropriate intervals. The opening position is set to be alternately set with the gap c # of the resistor piece 5 on the opposite side. It is also conceivable to form a gap by partially recessing the resistor pieces 5 and 5 to an appropriate depth instead of opening the gaps c and c 、 ５. Depending on the relationship between soft and hard geology etc. for the purpose of making holes, appropriate numbers are provided at three or four sides etc. without being provided on the front and rear surfaces of the auger rod or only on the left and right sides. In some cases. The blade width of the resistor pieces 5 and 5 is not limited to a value in which the resistance is increased during rotation. For example, a slightly raised convex strip may be formed on the rod surface. Is formed to have a diameter slightly larger or the same diameter as the rotation trajectory a of the screw blade piece 3 of the excavating device 1 to be connected to the excavation device 1. In the drawing, reference numeral 6 denotes a washer for connection with the auger rod 4 attached to the upper part of the excavating device 1.

【０００８】更に、他の実施例として図４に示す如く上
記オーガ杆４の下方にスクリュー翼片３の前後面の一部
に平坦面９、または切り欠け部分を形成してなるオーガ
ヘッド７を連結し用いることによって、上記抵抗片５、
５による掘削土礫の拡開圧締作用と同時に該拡開圧締作
用をより機能的効果的に行わしめることも出来得る。Further, as another embodiment, as shown in FIG. 4, there is provided an auger head 7 having a flat surface 9 or a cutout formed in a part of the front and rear surfaces of the screw blade piece 3 below the auger rod 4. By connecting and using, the above-mentioned resistance piece 5,
5, it is possible to more effectively and effectively perform the expanding and pressing action of the excavated debris.

【０００９】[0009]

【発明の効果】この発明は上記の如く、オーガロッドの
円周面の両側に一定刃巾の抵抗片５、５を軸方向に対し
て適当間隔毎に空隙ｃを隔てて交互に配設してなるオー
ガ杆４下方にスクリュー翼片３を有した掘進装置１を連
結して所定の地盤を掘孔行わしめることによって、如何
なる軟、硬質地盤であっても確実に掘孔掘進すると同時
に該掘進土礫を孔周壁面に強固に圧締し，以て杭孔掘削
作業中において孔壁面が崩壊する等の憂いを完全に解決
し、殆ど無排土の状体にて強固な杭孔を地中に確実容易
に施工することが出来得るのである。特に上記抵抗片
５、５回転時において孔周に強大な負荷抵抗を生ぜしめ
るとしてもこの発明による場合には該負荷抵抗を逆に利
用して孔周面に土礫を強固に圧締しようとするものであ
り、また空隙ｃを上記両側の抵抗片５、５に各交互に開
設したことによって掘進時における負荷抵抗も相当軽減
することも出来得る。即ち、抵抗片５と各空隙ｃの切欠
角縁部にて孔周の摩擦を切開すると同時に土礫の攪拌を
より良好確実に行わしめることが出来得る。しかも抵抗
片５、５の刃巾も従来の抵抗板に比して相当短巾に形成
してなるものであるから軽量にて製作も容易で安価に提
供することが出来得、且つ移動運搬時に破損及び付傷す
る等の憂いもない等顕著な効果を有している。As described above, according to the present invention, the resistance pieces 5, 5 having a fixed blade width are alternately arranged at appropriate intervals in the axial direction on both sides of the circumferential surface of the auger rod. By connecting the excavating device 1 having the screw wing pieces 3 below the auger rod 4 and excavating a predetermined ground, the excavation can be reliably performed in any soft or hard ground, and at the same time, the excavation can be performed. The debris is firmly pressed against the peripheral wall of the borehole, which completely resolves concerns such as the collapse of the borehole wall surface during the drilling work. It can be easily and reliably installed inside. In particular, even if a large load resistance is generated around the hole at the time of the rotation of the resistor pieces 5 and 5, in the case of the present invention, the load resistance is used in reverse to firmly compress debris around the hole. In addition, the load resistance at the time of excavation can be considerably reduced by alternately forming the gap c in the resistance pieces 5 and 5 on both sides. That is, the friction around the hole can be cut off at the notch corner of the resistance piece 5 and each gap c, and the debris can be stirred more reliably and at the same time. In addition, since the width of the blades of the resistance pieces 5 and 5 is formed to be considerably shorter than that of the conventional resistance plate, it can be provided easily at a light weight, easy to manufacture, and inexpensively. It has a remarkable effect such as no worries such as breakage and damage.

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

【図１】 この発明に係る基礎地盤掘孔装置の正面図、FIG. 1 is a front view of a foundation ground excavation device according to the present invention;

【図２】 同上、要部の断面図、FIG. 2 is a cross-sectional view of a main part of the above;

【図３】 他の掘進装置の連繋状体図である。 符号の説明 １ 掘進装置 ３ スクリュー翼片 ４ オーガ杆 ５ 抵抗片 ｃ 空隙FIG. 3 is an articulated body diagram of another digging device. EXPLANATION OF SYMBOLS 1 Drilling device 3 Screw wing piece 4 Auger rod 5 Resistance piece c Air gap

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 軸先端下方に先掘刃２を、該先掘刃２の
上部にスクリュー翼片３を付設せる掘進装置１の上部同
軸上に、周面前後または左右面に一定の長さ及び刃巾を
有した数ケの抵抗片５、５を長さ方向に対して適当間隔
毎に付設してなるオーガ杆４を連設し、かかる掘孔装置
を杭打機に吊設し動力を駆動させて所定地盤を回転掘孔
するにおいて、掘進装置１にて地盤下方の地盤を掘削拡
開し地中を掘進すると同時に該掘進装置１上部に連設せ
るオーガ杆４周面に付設せる抵抗片５、５が孔周の土圧
抵抗に抗しながら掘削土礫の攪乱と圧締とを連続的交互
に繰り返しながら上記掘削土礫を孔周壁に圧締し，地中
に強固な孔壁層を有した杭孔を掘孔しようとする基礎地
盤の施孔工法。1. An excavating blade 2 is provided below a tip of a shaft, and a screw blade 3 is attached to an upper portion of the excavating blade 2. The excavating device 1 is coaxial with an upper part of the excavating device. And an auger rod 4 in which a plurality of resistance pieces 5 having a blade width are provided at appropriate intervals in the length direction is connected, and such a drilling device is hung on a pile driving machine to generate power. Is driven to excavate and expand the ground below the ground with the excavating device 1 to excavate and expand the ground, and at the same time, it is attached to the peripheral surface of the auger rod 4 connected to the upper portion of the excavating device 1. The resistance pieces 5, 5 clamp the excavated debris against the peripheral wall of the hole while continuously and alternately disturbing and consolidating the excavated debris while resisting the earth pressure resistance around the hole, thereby forming a strong hole in the ground. A method of drilling a foundation ground where a pile hole with a wall layer is to be drilled. 【請求項２】 ヘッド先端下方に先掘刃２を、該先掘刃
２の上部にスクリュー翼片３を付設せる掘進装置１の上
部同軸上に、軸方向に対して一定の長さ及び刃巾を有し
た数ケの抵抗片５、５を適当間隔毎で且つ該間隔位置が
相互に異なるべく軸周面に交互に付設してなるオーガ杆
４を連結座金６を介して着脱自在に連結するように形成
せしめたことを特徴とする基礎地盤の施孔装置。2. An excavating blade 2 is provided below the tip of the head, and a screw blade 3 is attached to the upper part of the excavating blade 2. An auger rod 4 having a plurality of resistor pieces 5 and 5 having a width alternately attached to the shaft peripheral surface at appropriate intervals and at mutually different intervals is detachably connected via a connection washer 6. A perforation device for foundation ground, characterized in that the perforation device is formed such that 【請求項３】 ヘッド先端下方に先掘刃２を、該先掘刃
２の上部にスクリュー翼片３を付設せる掘進装置１の上
部同軸上に、軸方向に対して一定の長さ及び刃巾を有し
た数ケの抵抗片５、５を適当間隔毎に一体的に付設して
なるオーガ杆４を着脱自在に連接してなる基礎地盤の施
孔装置において、上記抵抗片５、５の外径寸ｂが少なく
とも下方に連接する掘進装置１のスクリュー翼片３の回
転軌跡ｃと稍径大径寸または同径寸巾に形成せしめたこ
とを特徴とする請求項２項記載の基礎地盤の施孔装置。3. An excavating blade 2 is provided below the tip of the head, and a screw blade 3 is attached to the upper portion of the excavating blade 2. In a perforating apparatus for a foundation ground comprising a plurality of resistance pieces 5 and 5 having a width and integrally attached at appropriate intervals, an auger rod 4 is removably connected to the foundation ground. 3. The foundation ground according to claim 2, wherein the outer diameter dimension b is at least slightly larger than the rotation trajectory c of the screw blade piece 3 of the excavating device 1 connected downward. Perforating equipment. 【請求項４】 軸方向に対して一定の長さ及び刃巾を有
した数ケの抵抗片５、５を適当間隔毎に一体的に付設し
てなるオーガ杆４において、該オーガ杆４の下方に杭孔
掘削時にスクリュー翼片３の前後面に平坦面８を、また
は切り欠け部分を形成してなるオーガヘッド７を連結せ
しめたことを特徴とする請求項２項記載の基礎地盤の施
孔装置。4. An auger rod 4 in which a plurality of resistance pieces 5, 5 having a fixed length and a blade width in the axial direction are integrally provided at appropriate intervals. 3. The foundation ground application according to claim 2, wherein a flat surface (8) or an auger head (7) formed with a cutout portion is connected to the front and rear surfaces of the screw blade pieces (3) at the time of excavating the pile hole. Hole device.