JP2007247349A

JP2007247349A - Excavation implement

Info

Publication number: JP2007247349A
Application number: JP2006075797A
Authority: JP
Inventors: Teizo Kobayashi; 定三小林; Makoto Igarashi; 誠五十嵐
Original assignee: KOBAYASHI KOGU SEISAKUSHO KK; Kobayashi Tool Mfg Co Ltd
Current assignee: KOBAYASHI KOGU SEISAKUSHO KK; Kobayashi Tool Mfg Co Ltd
Priority date: 2006-03-20
Filing date: 2006-03-20
Publication date: 2007-09-27

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manual type or electrically-drive excavation implement having a size and a weight portable by human power and capable of facilitating the excavation of large-diameter holes of a diameter between 100-300 mm on the ground as preliminary work when piles and foundations are arranged primarily on the ground. <P>SOLUTION: The excavation implement comprises a shaft rod 1 in which a screw thread 2 is mounted to its outer circumference; a tip member 6 mounted to the tip of the shaft rod 1 and having a sharpened tip; and a bent piece 7 protruding in the vicinity of the tip member 6 and capable of penetrating the ground from its tip when erected on the ground to penetrate the ground while digging up earth and sand ahead in the direction of rotation when the shaft rod 1 is rotated and remove dug-up earth and sand to the outside. The bent piece 7 can bore small holes and dig up earth and sand in the holes. The screw thread 2 can therefore easily penetrate the ground and bore holes of a desired diameter. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、穴掘り具に関し、主に地中に杭を打設したり土台を設置する際の予備作業として地表に穴を掘るための器具で、人力で持ち運び可能な大きさと重量を有する手動式或は電動式穴掘り具に関する。 The present invention relates to a hole digging tool, which is a tool for digging a hole in the ground surface as a preliminary work mainly when placing a pile in the ground or installing a foundation, and has a size and weight that can be carried manually. The present invention relates to a type or electric drilling tool.

このような穴掘り具に関する従来技術としては、特開平１１−３０３１１８の「測量杭穴掘具」（特許文献１）や、特開２００１−２３４５３３の「管杭及びその管杭の回転圧入施工法」（特許文献２）があった。 As a conventional technique related to such a drilling tool, “Surveying pile drilling tool” disclosed in JP-A-11-303118 (Patent Document 1) or “Pipe pile and rotational press-fitting method of the pipe pile” disclosed in JP-A-2001-234533. (Patent Document 2).

特許文献１のものは、軸棒の先端部を細長い差込軸体とし、この差込軸体の先端部に小型のねじ山すなわち先導螺旋を形成し、先端部に続く軸棒の外周に大きな穿孔螺旋を形成していた。この出願のものは、発明の名称「測量杭穴掘具」に示すとおり、測量用の杭を打設するための直径１００ｍｍ程度以下の小さな穴を掘るものである。 In Patent Document 1, the distal end portion of the shaft rod is formed into an elongated insertion shaft body, a small screw thread, that is, a leading spiral is formed at the distal end portion of the insertion shaft body, and the outer periphery of the shaft rod following the distal end portion is large. A perforated spiral was formed. The thing of this application digs a small hole about 100 mm or less in diameter for driving the pile for surveying as shown in the title "surveying pile drilling tool" of the invention.

次に、特許文献２のものは、管状の杭主体の先端に板状の支持基板を取付け、その板状の支持基板の中心下面に回転支点部材を突設するとともに、支持基板の下面で回転支点部材の周囲に掘削刃を突設している。回転支点部材は、土木建設現場で建設重機により管状の杭主体すなわち鋼管杭を回転させながら圧入する際の支点となるものである。また、掘削刃は、平板な板で形成され、杭主体が回転する方向に向かって所定の角度で傾斜した状態で支持基板の下面に突設されている。
特開平１１−３０３１１８号特開２００１−２３４５３３号 Next, the thing of patent document 2 attaches a plate-shaped support substrate to the front-end | tip of a tubular pile main body, and while providing the rotation fulcrum member on the center lower surface of the plate-shaped support substrate, it rotates on the lower surface of a support substrate. Excavation blades project around the fulcrum member. The rotation fulcrum member serves as a fulcrum when the tubular pile main body, that is, the steel pipe pile is pressed while being rotated by a heavy construction machine at a civil engineering construction site. The excavation blade is formed of a flat plate and protrudes from the lower surface of the support substrate in a state where the excavation blade is inclined at a predetermined angle in the direction in which the main body of the pile rotates.
JP-A-11-303118 JP 2001-234533 A

しかしながら、特許文献１の「測量杭穴掘具」は、先端部に形成された先導螺旋のねじ山が小さく、地中に差し込まれた差込軸体を回転させると、円錐形の穴が形成されるだけであるから、作業者が体重をかけながら「測量杭穴掘具」の軸棒を圧入回転しながら穿孔螺旋を回転させる必要がある。したがって、直径が２００ｍｍとか３００ｍｍという大径の穿孔螺旋の場合は、作業者が全体重をかけても容易ではない。 However, the “surveying pile drilling tool” of Patent Document 1 has a small screw thread of the leading spiral formed at the tip, and a conical hole is formed when the insertion shaft body inserted into the ground is rotated. Therefore, it is necessary for the operator to rotate the drilling spiral while press-fitting the shaft rod of the “surveying pile drilling tool” while applying weight. Therefore, in the case of a large-diameter drilling spiral having a diameter of 200 mm or 300 mm, it is not easy even if an operator puts the entire weight.

また、特許文献２の「管杭及びその管杭の回転圧入施工法」は、管状の杭主体より板状の支持基板の直径が大きく、平板な板で形成された掘削刃は、掘り進んだ土砂を単に掘削刃の上方へ移動するだけである。したがって、支持基板と掘削刃との間から押し出された土砂が、掘削刃の外周に押し出されるときの抵抗も加わることになる。しかしながら、この発明の場合は、土木建設現場で建設重機により管状の杭主体すなわち鋼管杭を回転させながら圧入するのであり、穴を掘削するものではない。また、掘削刃は、螺旋状の刃が無いので土砂を掘るが、掘った土砂は平板な板で遮られて穴の外に排出できない。 In addition, the “pipe pile and the rotary press-fitting method of the pipe pile” of Patent Document 2 has a larger diameter of the plate-like support substrate than the main body of the tubular pile, and the excavation blade formed of a flat plate has been dug. It simply moves the earth and sand up the excavating blade. Therefore, resistance when the earth and sand pushed out between the support substrate and the excavation blade is pushed out to the outer periphery of the excavation blade is also added. However, in the case of the present invention, a tubular pile main body, that is, a steel pipe pile, is pressed and rotated by a heavy construction machine at a civil engineering construction site, and a hole is not excavated. In addition, the excavating blade does not have a spiral blade, so it digs earth and sand, but the excavated earth and sand is blocked by a flat plate and cannot be discharged out of the hole.

本発明は、主に地中に杭を打設したり土台を設置する際の予備作業として地表に穴を掘るための器具で、人力で持ち運び可能な大きさと重量を有する手動式或は電動式穴掘り具であって、直径が２００〜３００ｍｍの穴を一人の人間の力程度で掘削できるものを提供することを目的としている。 The present invention is a tool for digging a hole in the ground surface as a preliminary work mainly when placing a pile in the ground or installing a foundation, and is a manual or electric type having a size and weight that can be carried manually. An object of the present invention is to provide a drilling tool that can drill a hole having a diameter of 200 to 300 mm with the power of one person.

本発明の穴掘り具は、外周にねじ山を取付けた軸棒と、該軸棒の先端に取付けた前記ねじ山より径が小さく先端が尖った先端部材と、該先端部材の近傍に突設され、先端部材を地上に立設したとき先端部材に続いて地上に接触し、軸棒を回転させると回転方向の前方の土砂を掘り起こしながら地中に侵入し、掘り起こした土砂を外側に排除する曲折片とを有し、前記軸棒の中心から前記曲折片の最も外側までの半径が、前記ねじ山の半径より小さいことを特徴としている。 The drilling tool of the present invention includes a shaft rod having a screw thread attached to the outer periphery, a tip member having a diameter smaller than the screw thread attached to the tip of the shaft rod, and a tip member protruding in the vicinity of the tip member. When the tip member is erected on the ground, it comes into contact with the ground following the tip member, and when the shaft is rotated, it penetrates into the ground while digging up the sediment in front of the rotation direction, and the digged up sediment is removed to the outside. And a radius from the center of the shaft rod to the outermost side of the bent piece is smaller than a radius of the screw thread.

前記先端部材と曲折片とが１枚の板からなり、該板に２本の切欠溝を形成してこれらの間に先端部材を形成し、両切欠溝の外側部分を折り曲げることによって前記曲折片を形成した構成としたり、前記先端部材が円錐又は角錐で、前記曲折片が、前記軸棒の外周に固定されている構成としたり、前記曲折片が、複数設けられている構成としたり、前記軸棒のねじ山の山と山との間に連結棹を架設した構成としたりすることもできる。 The tip member and the bent piece are formed of a single plate, two cutout grooves are formed in the plate, a tip member is formed therebetween, and the bent portions are bent by bending the outer portions of the cutout grooves. The tip member is a cone or a pyramid, the bent piece is fixed to the outer periphery of the shaft rod, the bent piece is provided in a plurality, It can also be set as the structure which erected the connecting rod between the threads of the shaft rod thread.

なお、本発明の穴掘り具の構成は、図示した形状にこだわるものではなく、それぞれの構成の目的に合致していれば、いかなる形状であっても良い。 The configuration of the drilling tool of the present invention is not particularly limited to the illustrated shape, and may be any shape as long as it matches the purpose of each configuration.

本発明の穴掘り具は、先端部材の先端が尖っているので、穴掘り具の尖った先端部材を地上に立設すると、先端部材の尖った先端を地中に差し込め、掘る穴の位置を正確に決められる。把持部を回して軸棒を回転させると、曲折片の先端が地表に達して地中に食い込み始め、回転方向の前方の土砂を掘り起こしながら地中に侵入し、掘り起こした土砂を外側に排出する。軸棒を回転させるだけで曲折片は地中深く侵入し、やがてねじ山の先端が地表に達する。曲折片により土が破砕されているので、ねじ山は容易に地中に進入でき、この後、ねじ山による掘削が進められ、所望の位置まで掘り進んだ状態で穴掘り具を抜きとれば、軸棒の外周にねじ山の直径と同じ外径の穴ができる。この穴に杭を差し込んで打ち込めば、容易に杭打ちが完了する。ねじ山の山と山との間に連結棹を設ければ、ねじ山間の土砂と外周の土砂が明確に切り離され、所望の位置まで掘り進んだ穴掘り具を容易に抜き取れる。 In the drilling tool of the present invention, since the tip of the tip member is sharp, when the tip member of the drilling tool is erected on the ground, the tip of the tip member is inserted into the ground, and the position of the hole to be dug is determined. Accurately determined. When the gripping part is turned and the shaft is rotated, the tip of the bent piece reaches the ground surface and begins to bite into the ground, while digging up the soil in front of the rotation direction and entering the ground, and discharging the dug up earth to the outside . Just by rotating the shaft rod, the bent piece penetrates deep into the ground, and eventually the tip of the thread reaches the ground surface. Since the soil is crushed by the bent pieces, the screw thread can easily enter the ground, and after this, drilling with the screw thread is advanced, and if the drilling tool is pulled out to the desired position, A hole with the same outer diameter as that of the thread is formed on the outer periphery of the shaft rod. Pile driving is easily completed by inserting a pile into this hole and driving it. If a connecting rod is provided between the threads, the earth and sand between the threads and the outer earth and sand can be clearly separated, and the drilling tool that has been dug to a desired position can be easily extracted.

前記先端部材と曲折片とが１枚の板からなり、該板に２本の切欠溝を形成してこれらの間に先端部材を形成し、両切欠溝の外側部分を折り曲げることによって前記曲折片を形成することにすれば、先端部材と曲折片を簡単に、かつ、安価に形成することができる。前記曲折片が、複数設けられた構成にすると、掘削が能率的にできる。 The tip member and the bent piece are formed of a single plate, two cutout grooves are formed in the plate, a tip member is formed therebetween, and the bent portions are bent by bending the outer portions of the cutout grooves. If this is formed, the tip member and the bent piece can be formed easily and inexpensively. Excavation can be efficiently performed when a plurality of the bent pieces are provided.

以下、本発明の穴掘り具の実施の形態を添付図面を参照して説明する。図１は本発明の穴掘り具の斜視図である。この図に示すように、円形の管を所定の長さに切断して軸棒１とする。この軸棒１の一端を板状にプレス加工し、この板状の軸棒１の一端に把持部４を取付ける。図では、軸棒１と把持部４は固着してあるが、着脱自在であっても良い。軸棒１の先端部の外周には、羽根状で螺旋状のねじ山２を取付ける。この羽根状のねじ山２の外周側には、ねじ山と山との間に連結棹３が架設されている。連結棹３は、軸棒１を回転するときの先方側が刃となった帯板からなる。この連結棹３は、軸棒１を回転しながら地中を掘り進めるとき、上下のねじ山２間の土砂とねじ山の外周の土砂を明確に切り裂くためのものである。 Embodiments of a drilling tool according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a drilling tool of the present invention. As shown in this figure, a circular tube is cut into a predetermined length to form a shaft rod 1. One end of the shaft rod 1 is pressed into a plate shape, and the grip portion 4 is attached to one end of the plate shaft shaft 1. In the figure, the shaft 1 and the grip portion 4 are fixed, but they may be detachable. A blade-like spiral thread 2 is attached to the outer periphery of the tip of the shaft 1. On the outer peripheral side of the blade-like thread 2, a connecting rod 3 is installed between the thread and the thread. The connecting rod 3 is composed of a strip having a blade on the front side when the shaft 1 is rotated. The connecting rod 3 is used for clearly cutting the earth and sand between the upper and lower screw threads 2 and the outer earth and sand of the screw thread when the shaft 1 is rotated to dig into the ground.

この管製軸棒1の先端の穴に図２の側面図に示した上部が円錐形で下部が柱状の封止栓５の円柱部分を埋め込む。この封止栓５は、軸棒１が管製で先端に穴が開口しているのでこの穴を塞ぐためのものであり、軸棒１が、中実の丸棒で形成してあれば無用である。この封止栓５は、土砂を掘り起こす際の抵抗を少なくするために、先端が円錐形か、球体の一部であることが望ましい。また、後述する先端部材６と兼用にすることもできる。 A cylindrical portion of the sealing plug 5 having a conical upper portion and a columnar lower portion shown in the side view of FIG. This sealing plug 5 is for closing the hole since the shaft 1 is made of a tube and has a hole at the tip, and is unnecessary if the shaft 1 is formed of a solid round bar. It is. It is desirable that the sealing plug 5 has a conical tip or a part of a sphere in order to reduce resistance when digging up earth and sand. Moreover, it can also serve as the front-end | tip member 6 mentioned later.

この封止栓５の先端に、先端部材６と曲折片７を取付ける。先端部材６と曲折片７は、図３の正面図に示す形状の１枚の板に、２本の切欠溝８を形成して両切欠溝８，８間を先端部材６とし、切欠溝８，８の両側の部分を曲折線９で互いに反対方向に折り曲げて曲折片７を形成したものである。折り曲げ後の状態を図４の平面図、図５の側面図に示す。曲折線９は、軸棒１の長手方向と交差する線であり、直交する線よりは、傾斜した交差線が望ましい。さらに、図３に示すようにこの曲折線９の外周側よりも中心側すなわち先端部材６側が、穴掘り具の先端側にあって、曲折片７はやや内側に向かって折り曲げられていることが望ましい。 The tip member 6 and the bent piece 7 are attached to the tip of the sealing plug 5. The tip member 6 and the bent piece 7 are formed in a single plate having the shape shown in the front view of FIG. 3 by forming two notch grooves 8 between the notch grooves 8, 8. , 8 are bent at opposite sides of the bent line 9 to form bent pieces 7. The state after bending is shown in the plan view of FIG. 4 and the side view of FIG. The bent line 9 is a line that intersects the longitudinal direction of the shaft 1, and an inclined intersecting line is preferable to an orthogonal line. Furthermore, as shown in FIG. 3, the center side, that is, the tip member 6 side of the bent line 9 is closer to the tip side of the digging tool, and the bent piece 7 is bent slightly inward. desirable.

上記曲折片７を前記軸棒１の長手方向と交叉する方向の曲折線９を有する曲折片７とすることにより、曲折片７が地中に入り込みやすくなり、軸棒１を回転させたとき曲折片７の前方の土砂を掘り起こしやすい。この曲折線９を軸棒１の長手方向と直交する方向ではなく、やや傾斜（図では約２０度傾斜）させ、曲折片７の先端の外周側を内周側より軸棒側に近づけると、曲折片７が掘り起こした土砂を掘り起こした位置より外側に排出しやすくなる。 By making the bent piece 7 a bent piece 7 having a bent line 9 in a direction intersecting with the longitudinal direction of the shaft rod 1, the bent piece 7 can easily enter the ground and bend when the shaft rod 1 is rotated. It is easy to dig up the soil in front of the piece 7. When the bent line 9 is not inclined in the direction perpendicular to the longitudinal direction of the shaft rod 1 but slightly inclined (inclined by about 20 degrees in the figure), the outer peripheral side of the tip of the bent piece 7 is closer to the shaft rod side than the inner peripheral side, It becomes easy to discharge the earth and sand dug up by the bent piece 7 to the outside.

図から明らかなように、軸棒１の中心から曲折片７の一番外側までの距離は、ねじ山２の半径より小さくなっている。 As is clear from the figure, the distance from the center of the shaft 1 to the outermost side of the bent piece 7 is smaller than the radius of the thread 2.

上記実施例では、先端部材６の両端に曲折片７が直線的に配されているが、板状の先端部材６と直交する方向の両側に曲折片７を配置しても良い。また、曲折片７は、封止栓５上に突設されているが、先端部材６の側から突設しても良いし、後述するように、軸棒１の先端部脇から突設しても良い。さらに、図では、２個の曲折片７を軸心から放射方向に形成しているが、３個以上の曲折片７を軸心から放射方向に配置したり、軸心から放射方向に向かう線から外れた位置に配置しても良い。その配置位置は、軸棒１が回転する方向と対向できる位置であれば良く、対向角度も直角にこだわるものではなく、やや傾斜させ、曲折片７が掘り起こした土砂を外周方向に排出できる形状であれば、いかなる形状であっても良い。すなわち、曲折片７は、軸棒１の先端部に取付けてあって、穴掘り具を水平方向に回転したとき、曲折片７の前方の土砂を掬いやすい形状でかつ掬い取った土砂を曲折片７の外側方向に排出できる構造であれば、如何なる設置位置と形状であっても良いのである。 In the above embodiment, the bent pieces 7 are linearly arranged at both ends of the tip member 6, but the bent pieces 7 may be arranged on both sides in a direction orthogonal to the plate-like tip member 6. Further, the bent piece 7 protrudes on the sealing plug 5 but may protrude from the tip member 6 side, or protrude from the side of the tip portion of the shaft 1 as will be described later. May be. Further, in the figure, two bent pieces 7 are formed in the radial direction from the axial center, but three or more bent pieces 7 are arranged in the radial direction from the axial center, or a line extending in the radial direction from the axial center. You may arrange | position in the position remove | deviated from. The arrangement position may be a position that can be opposed to the direction in which the shaft 1 rotates, and the opposing angle is not particular at a right angle, but is slightly inclined and is shaped so that the earth and sand dug by the bent piece 7 can be discharged in the outer circumferential direction. Any shape can be used. In other words, the bent piece 7 is attached to the tip of the shaft 1 and the bent sand is formed in a shape that facilitates scooping up the soil in front of the bent piece 7 when the drilling tool is rotated in the horizontal direction. Any installation position and shape may be used as long as the structure can be discharged in the direction of the outer side.

図６は本発明の他の実施例を示す斜視図である。図６に示すように、先端部材６に代えて円錐形の先端部材１０とし、曲折片７を軸棒１の先端部外周に取付けることもできる。前述の実施例のように、この円錐形の先端部材１０の円錐形部分を三角錐形などの多角錐にするなど、地中に侵入しやすい形状であればいかなる形状であっても良い。また、曲折片７を先端部材１０の基部から突出させるなど図示した以外の様々な形状とすることができる。 FIG. 6 is a perspective view showing another embodiment of the present invention. As shown in FIG. 6, a conical tip member 10 may be used instead of the tip member 6, and the bent piece 7 may be attached to the outer periphery of the tip portion of the shaft 1. As in the above-described embodiment, any shape may be used as long as the conical portion of the conical tip member 10 is a polygonal pyramid such as a triangular pyramid. Further, the bent piece 7 can have various shapes other than those illustrated, such as protruding from the base of the tip member 10.

自動販売機を設置するための杭を打ち込むには、直径が２００ｍｍ程度の穴を穿ける必要がある。上記構成の穴掘り具でこのような穴を穿ける場合、例えば、地上の位置に先端部材６の尖った先端を合わせてほぼ垂直に立てると、まず、先端部材６の尖った先端が地上に突き刺さり、引続き曲折片７の先端が地上に接触し、穴掘り具の重さで突き刺さりながら穴掘り具全体がわずかに水平方向に回転する。この状態で、作業者が穴掘り具の一端の把持部４を握って水平方向に回転させると、穴掘り具全体が回転するにつれて先端部材６と曲折片７の先端も回転しながら地中に深く進入する。このとき曲折片７は土砂を掘り起こし掘り起こした土砂は曲折片７上から外周方向に押し出しながら進む。さらに、把持部４を回転させると、管製の軸棒１の羽根状で螺旋状のねじ山２が、地面上に到達する。さらに、把持部４を回転させ続けると、曲折片７によって土砂が掘り起こされているので、螺旋状のねじ山２も回転しながら地中に侵入する。この穴掘り具の隣接する螺旋状のねじ山２の外周に帯板で形成した連結棹３が取付けられていれば、螺旋状のねじ山２間の土砂と螺旋状のねじ山２の外周の土砂は切り裂かれていることになる。掘り起こされた土砂は、螺旋状のねじ山２に沿って上昇して地上に排出される。 In order to drive a pile for installing a vending machine, it is necessary to make a hole having a diameter of about 200 mm. When drilling such a hole with the drilling tool having the above-described configuration, for example, when the sharp tip of the tip member 6 is aligned with the position on the ground and stands substantially vertically, the sharp tip of the tip member 6 is first placed on the ground. Then, the tip of the bent piece 7 comes into contact with the ground, and the entire digging tool rotates slightly in the horizontal direction while piercing with the weight of the digging tool. In this state, when the operator grips the grip portion 4 at one end of the digging tool and rotates it horizontally, the tip of the tip member 6 and the bent piece 7 rotates while the whole of the digging tool rotates. Enter deeply. At this time, the bent piece 7 digs up the earth and sand, and the excavated earth and sand advances while being pushed out from the bent piece 7 in the outer peripheral direction. Further, when the gripping portion 4 is rotated, the blade-like and spiral thread 2 of the tube shaft 1 reaches the ground surface. Further, when the gripping portion 4 is continuously rotated, the earth and sand are dug up by the bent piece 7, so that the spiral thread 2 also enters the ground while rotating. If the connecting rod 3 formed of a strip is attached to the outer periphery of the adjacent spiral thread 2 of this drilling tool, the earth and sand between the spiral threads 2 and the outer periphery of the spiral thread 2 The earth and sand are torn. The excavated earth and sand rises along the spiral thread 2 and is discharged to the ground.

上記のようにして所望の深さまで掘り進んだ穴掘り具を引き抜くと、穴掘り具を引き抜いた跡に柱状の穴が残る。この穴に杭を差込み打設したり、土台用のコンクリートを流し込んだり、土台用のコンクリートブロックを投入すると、作業が簡単にできる。 When the digging tool that has been dug to the desired depth as described above is pulled out, a columnar hole remains on the trace from which the digging tool has been pulled out. The work can be done easily by inserting a pile into this hole, casting concrete for foundation, or putting in concrete blocks for foundation.

本発明の穴掘り具は、曲折片７が目的の穴径より小さな穴を掘る点では、特許文献１に記載したのと同じである。しかし、特許文献１に記載のものは先端側に形成された差込軸棒が螺旋状になっているので、土を破砕する力が弱く、穿孔螺旋が地表に達したとき、地中には入り難くなっており、大きな力が必要となる。直径が２００ｍｍを越えると、人力では非常に困難である。 The hole digging tool of the present invention is the same as that described in Patent Document 1 in that the bent piece 7 digs a hole smaller than the target hole diameter. However, since the insertion shaft rod formed on the tip side of the one described in Patent Document 1 has a spiral shape, the force to crush the soil is weak, and when the drilling spiral reaches the ground surface, It is difficult to enter and requires a lot of power. When the diameter exceeds 200 mm, it is very difficult by human power.

これに対し、本発明の穴掘り具では、曲折片７が螺旋状ではないので、土を掘り起こしで破砕する力が大きく、曲折片７で開けた穴の中の土は、すべて破砕されている。したがった、この穴をねじ山２で容易に大きくすることが可能となる。ねじ山２の径が２００〜３００ｍｍになっても、一人の力で所望の径の穴を穿けることが可能となる。 On the other hand, in the hole digging tool of the present invention, since the bent piece 7 is not spiral, the force to dig up and crush the soil is large, and all the soil in the hole opened by the bent piece 7 is crushed. . Therefore, this hole can be easily enlarged by the thread 2. Even if the diameter of the screw thread 2 is 200 to 300 mm, it is possible to make a hole with a desired diameter by one person.

上記の実施例では人力で穴を穿設する例を示したが、軸棒１をモータ等の動力源に接続し、動力で駆動することができるが、動力としては、人力程度の出力があればよい。 In the above embodiment, an example in which the hole is manually drilled is shown. However, the shaft 1 can be connected to a power source such as a motor and driven by power. That's fine.

尚、本発明の穴掘り具は、上記した実施の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることができる。 In addition, the drilling tool of this invention is not limited to above-described embodiment, A various change can be added in the range which does not deviate from the summary of this invention.

本発明の穴あけ具は、上述のごとく、杭打ちの事前作業としての穴掘りや、土台用コンクリート形成の事前作業としての穴掘りなど、諸々の目的で地上に穴を掘る手動用具或は電動用具として利用できる。 As described above, the drilling tool of the present invention is a manual tool or a power tool for digging a hole on the ground for various purposes such as drilling as a preliminary work for pile driving or drilling as a preliminary work for concrete formation for foundation. Available as

本願発明の穴掘り具を示す斜視図である。It is a perspective view which shows the digging tool of this invention. 本願発明の穴掘り具における円錐台形の封止栓の拡大側面図である。It is an enlarged side view of the truncated cone-shaped sealing stopper in the drilling tool of this invention. 先端部材と曲折片の折り曲げ前の状態を示す拡大正面図である。It is an enlarged front view which shows the state before bending of a front-end | tip member and a bending piece. 先端部材と曲折片の拡大平面図である。It is an enlarged plan view of a tip member and a bent piece. 先端部材と曲折片の拡大側面図である。It is an enlarged side view of a tip member and a bending piece. 本願発明の穴掘り具の他の実施例を示す斜視図である。It is a perspective view which shows the other Example of the digging tool of this invention.

符号の説明Explanation of symbols

１管製の軸棒
２羽根状で螺旋状のねじ山
３帯板で形成した連結棹
４把持部
５円錐台形の封止栓
６先端部材
７曲折片
８切欠溝
９曲折線
１０円錐台形の先端部材 DESCRIPTION OF SYMBOLS 1 Tube shaft 2 Blade-shaped spiral screw thread 3 Coupling rod 4 formed with a strip plate 4 Gripping part 5 Frustum-shaped sealing plug 6 Tip member 7 Bending piece 8 Notch groove 9 Bending line 10 Frustum-shaped tip Element

Claims

外周にねじ山を取付けた軸棒と、該軸棒の先端に取付けた前記ねじ山より径が小さく先端が尖った先端部材と、該先端部材の近傍に突設され、先端部材を地上に立設したとき先端部材に続いて地上に接触し、軸棒を回転させると回転方向の前方の土砂を掘り起こしながら地中に侵入し、掘り起こした土砂を外側に排除する曲折片とを有し、前記軸棒の中心から前記曲折片の最も外側までの半径が、前記ねじ山の半径より小さいことを特徴とする穴掘り具。 A shaft rod having a screw thread on the outer periphery, a tip member having a diameter smaller than the screw thread attached to the tip of the shaft rod, a tip member having a sharp tip, and protruding in the vicinity of the tip member so that the tip member stands on the ground. When it is installed, it comes into contact with the ground following the tip member, and when the shaft is rotated, it enters into the ground while digging up the sediment in front of the rotation direction, and has a bent piece that excludes the digged up sediment outside. A drilling tool, wherein a radius from a center of a shaft rod to an outermost side of the bent piece is smaller than a radius of the thread.

前記先端部材と曲折片とが１枚の板からなり、該板に２本の切欠溝を形成してこれらの間に先端部材を形成し、両切欠溝の外側部分を折り曲げることによって前記曲折片を形成したことをことを特徴とする請求項１記載の穴掘り具。 The tip member and the bent piece are formed of a single plate, two cutout grooves are formed in the plate, a tip member is formed therebetween, and the bent portions are bent by bending the outer portions of the cutout grooves. The digging tool according to claim 1, wherein:

前記先端部材が円錐又は角錐で、前記折曲片が、前記軸棒の外周に固定されていることを特徴とする請求項１記載の穴掘り具。 The drilling tool according to claim 1, wherein the tip member is a cone or a pyramid, and the bent piece is fixed to an outer periphery of the shaft rod.

前記折曲片が、複数設けられていることを特徴とする請求項１から３のいずれかに記載の穴掘り具。 The digging tool according to any one of claims 1 to 3, wherein a plurality of the bent pieces are provided.