JP6710236B2

JP6710236B2 - Drilling stirrer

Info

Publication number: JP6710236B2
Application number: JP2018099079A
Authority: JP
Inventors: 和夫渡邉; 淳司渡邉
Original assignee: 和夫渡邉; 淳司渡邉
Priority date: 2018-05-23
Filing date: 2018-05-23
Publication date: 2020-06-17
Anticipated expiration: 2034-11-25
Also published as: JP2018150801A

Description

本発明は、地盤を掘削して掘削土と硬化材とを攪拌混合し、掘削土を硬化材により凝固させた地中杭を造成するための掘削攪拌装置に関する。 The present invention relates to an excavating and agitating device for excavating the ground to agitate and mix excavated soil and a hardened material to form an underground pile in which the excavated soil is solidified with the hardened material.

従来から軟弱地盤を改良する目的で、地盤を掘削した土砂とセメントなどの硬化材とを地中において攪拌混合し、凝固した掘削土を地中杭として又は地中杭を列状に設けた地中壁として造成するための掘削攪拌装置が知られている（特許文献１及び特許文献２を参照）。 Conventionally, for the purpose of improving soft ground, the soil excavated from the ground and a hardening material such as cement are stirred and mixed in the ground, and the solidified excavated soil is used as an underground pile or a ground pile is provided in a row. An excavation and agitation device for forming an inner wall is known (see Patent Documents 1 and 2).

前記特許文献１及び引用文献２に開示されている掘削攪拌装置は、中空軸の先端に設けられた掘削翼と、この掘削翼の少し上方に設けられた攪拌翼とを備えており、中空軸の回転に伴って掘削翼を水平に回転させて土壌を掘削すると共に、掘削した土砂と前記中空軸の先端から吐出されるセメントミルクなどの硬化材とを攪拌翼によって地中で攪拌混合し、掘削した土砂を硬化材により凝固させて地中杭を造成する。 The excavating and agitating device disclosed in Patent Document 1 and Cited Document 2 includes an excavating blade provided at the tip of the hollow shaft and a stirring blade provided slightly above the excavating blade. While excavating the soil by horizontally rotating the excavation blade with the rotation of, the earth and sand excavated and the hardened material such as cement milk discharged from the tip of the hollow shaft is stirred and mixed in the ground by the stirring blade, The excavated earth and sand are solidified with a hardening material to form underground piles.

ところで、軟弱地盤の改良にあたっては、地盤の強化や止水等の目的のために、上記したように地中杭を列状に複数並べて地中壁を造成する場合がある。このような地中壁を造成する場合には、隣り同士の地中杭をできるだけ接近させて両者間の隙間が小さくなるように造成することが望ましく、さらに両者間の隙間をできるだけ小さくするためには個々の地中杭を角形に形成し、隣接する地中杭との接触面積を大きく取ることが望まれる。しかしながら、上記特許文献１及び特許文献２に開示された掘削攪拌装置にあっては、攪拌翼が中空軸の回りを回転できる構造になっており、攪拌翼で土砂と硬化材とを攪拌混合する際には攪拌翼が中空軸の回りを回転しながら攪拌することから、凝固した地中杭の形状も掘削穴の形状と同様に円形になってしまう。 By the way, in the improvement of soft ground, there are cases where a plurality of underground piles are arranged in a row to form an underground wall for the purpose of strengthening the soil or stopping water. When constructing such an underground wall, it is desirable to construct adjacent underground piles as close as possible to each other so that the gap between them is small, and to further minimize the gap between them. It is desirable that each underground pile should be formed in a square shape and the contact area with the adjacent underground pile should be large. However, in the excavation and agitation device disclosed in Patent Documents 1 and 2, the agitating blade has a structure capable of rotating around the hollow shaft, and the agitating blade mixes and mixes the earth and sand and the hardening material. At this time, the stirring blade rotates while stirring around the hollow shaft, so that the shape of the solidified underground pile also becomes circular, like the shape of the drill hole.

特開平８−１３４７３号公報JP-A-8-13473 特公昭６３‐３８４９６号公報JP-B-63-38496

本発明が解決しようとする課題は、地盤に角形の掘削穴を掘削すると共に、掘削した土砂と硬化材とを攪拌混合して角形に凝固させた地中杭を造成することのできる掘削攪拌装置を提供することにある。 The problem to be solved by the present invention is to excavate a rectangular excavation hole in the ground and to agitate and mix excavated earth and sand with a hardened material to form an underground pile piled into a rectangular shape to excavate and agitate. To provide.

上記課題を解決するために、本発明に係る掘削攪拌装置は、移動手段で移動できるベースマシーンの先端部分に垂直に立設した支柱と、
前記支柱に上下スライド可能に取り付けられたオーガモータと、
前記オーガモータのケーシングに上端部を垂設するとともに、下端部付近が前記支柱から延びる振止用のホルダを介して上下スライド可能に取り付けられたガイドパイプ内に取り付けた掘削攪拌装置の回転ロッドと、
前記回転ロッドの先端に設けられ、回転ロッドと共に水平方向に回転する水平掘削部と、
前記水平掘削部の上方に配置された垂直掘削部と、
前記回転ロッドの回転を動力伝達して前記垂直掘削部に垂直方向の回転力を付与する機械要素とを備え、
前記垂直掘削部が前記回転ロッドの外周を被覆するガイドパイプの下端に連結された機械要素の保護ケースを備え、該保護ケースは回転ロッドの回転とは切り離されているガイドパイプに一体に固定されている。 In order to solve the above-mentioned problems, the excavation and agitation device according to the present invention comprises a support column vertically erected at the tip portion of the base machine that can be moved by a moving means,
An auger motor attached to the pillar so as to be vertically slidable,
A rotating rod of an excavating stirring device mounted in a guide pipe vertically slidably mounted on the casing of the auger motor, and a lower end portion of the auger motor is slidably mounted through a holder for vibration isolation extending from the column.
A horizontal excavation unit which is provided at the tip of the rotating rod and rotates in the horizontal direction together with the rotating rod,
A vertical excavation section arranged above the horizontal excavation section,
A mechanical element for transmitting the rotation of the rotating rod to give a vertical rotating force to the vertical excavation unit,
The vertical excavation unit includes a protective case of a mechanical element connected to a lower end of a guide pipe covering the outer circumference of the rotating rod, and the protective case is integrally fixed to the guide pipe separated from the rotation of the rotating rod. ing.

また、本発明の一実施形態では、前記機械要素が、前記回転ロッドに固定される一対の主傘歯車と、前記主傘歯車と噛み合い前記主傘歯車の回転に伴って回転する一対の従傘歯車とを備える傘状歯車からなり、前記一対の主傘歯車のうち少なくとも一方の主傘歯車と回転ロッドとの間にスラストベアリングが設けられている。 Further, in one embodiment of the present invention, the mechanical element is a pair of main bevel gears fixed to the rotating rod, and a pair of sub-bevels that mesh with the main bevel gear and rotate with the rotation of the main bevel gear. A thrust bearing is provided between at least one of the pair of main bevel gears and the rotating rod.

また、本発明の一実施形態では、前記垂直掘削部は、複数の垂直回転翼と、前記複数の垂直回転翼に取り付けられる第２掘削刃とを備え、少なくとも前記第２掘削刃は前記垂直回転翼が垂直方向に回転する際の垂直な平面に対して所定の傾斜角度で取り付けられている。 Further, in an embodiment of the present invention, the vertical excavation unit includes a plurality of vertical rotary blades and a second excavating blade attached to the plurality of vertical rotary blades, and at least the second excavating blade has the vertical rotary blade. The blade is mounted at a predetermined tilt angle with respect to a vertical plane as the blade rotates in the vertical direction.

本発明に係る掘削攪拌装置は、回転ロッドの回転を動力伝達して垂直掘削部に垂直方向の回転力を付与する機械要素を備え、且つ前記垂直掘削部が前記回転ロッドの回転と切り離された固定部材に回転可能に支持されているので、垂直掘削部が回転ロッドの回りを回転することなく垂直方向のみに回転することで、角形の掘削穴とこの穴形状に対応した角形の地中杭とを造成することができる。 The excavation and agitation apparatus according to the present invention includes a mechanical element that transmits the rotation of the rotating rod to give a vertical rotating force to the vertical excavating portion, and the vertical excavating portion is separated from the rotation of the rotating rod. Since it is rotatably supported by the fixed member, the vertical excavation part rotates only in the vertical direction without rotating around the rotating rod, and thus the rectangular excavation hole and the square underground pile corresponding to this hole shape. And can be created.

また、本発明に係る掘削攪拌装置では、回転ロッドの回転を動力伝達して垂直掘削部に垂直方向の回転力を付与する機械要素として傘状歯車が用いられ、この傘状歯車の一対の主傘歯車のうち少なくとも一方の主傘歯車と回転ロッドとの間にスラストベアリングが設けられているので、掘削時に回転ロッドの軸方向に働く力をスラストベアリングによって受け止め、下側主傘歯車が柔軟に動き得るので、傘状歯車の主傘歯車と従傘歯車の噛み合いによる回転トラブルを避けることができる。 Further, in the excavation and agitation device according to the present invention, a bevel gear is used as a mechanical element that transmits the rotation of the rotary rod to give a vertical rotational force to the vertical excavation portion, and a pair of main gears of the bevel gear are used. Since the thrust bearing is provided between at least one of the bevel gears and the rotating rod, the thrust bearing receives the force acting in the axial direction of the rotating rod at the time of excavation, and the lower main bevel gear flexibly. Since it can move, it is possible to avoid a rotational trouble due to the meshing of the main bevel gear and the sub-bevel gear of the bevel gear.

また、本発明に係る掘削攪拌装置では、垂直回転翼に取り付けられた第２掘削刃が、前記垂直回転翼が垂直方向に回転する際の垂直な平面に対して所定の傾斜角度で取り付けられているので、水平掘削部によって掘削した円形穴の内周壁を傾斜した第２掘削刃が巻き込むようにして削り取ることで、円形の内周壁に４カ所の角部が形成され、ほぼ平らな四つの壁面からなる角形穴を形成することができる。 Further, in the excavating and stirring device according to the present invention, the second excavating blade attached to the vertical rotor is attached at a predetermined inclination angle with respect to a vertical plane when the vertical rotor rotates in the vertical direction. As a result, the inner peripheral wall of the circular hole excavated by the horizontal excavating part is scraped off by the inclined second excavating blade so that four corners are formed on the circular inner peripheral wall. It is possible to form a square hole consisting of

本発明に係る掘削攪拌装置の使用状態を示す全体図である。It is a whole figure showing the use state of the excavation stirring device concerning the present invention. 本発明の一実施形態に係る掘削攪拌装置の要部を示す正面図である。It is a front view showing the important section of the excavation stirring device concerning one embodiment of the present invention. 本発明の一実施形態に係る掘削攪拌装置の動力変換部を示す概念図である。It is a conceptual diagram which shows the power conversion part of the excavation stirring device which concerns on one Embodiment of this invention. 本発明の一実施形態に係る掘削攪拌装置の要部の斜視図である。It is a perspective view of the important section of the excavation stirring device concerning one embodiment of the present invention. 本発明の一実施形態に係る掘削攪拌装置の水平回転翼と垂直回転翼によって掘削される掘削穴の外形線を示す説明図である。It is explanatory drawing which shows the outline of the excavation hole excavated by the horizontal rotary blade and vertical rotary blade of the excavation stirring device which concerns on one Embodiment of this invention.

以下添付図面に基づいて本発明の一実施形態に係る掘削攪拌装置を詳細に説明する。図１に示されるように、この実施形態に係る掘削攪拌装置１は、キャタピラ２で移動できるベースマシーン３の先端部分に高い支柱４を垂直に立設し、この支柱４にオーガモータ５が上下スライド可能に取り付けられている。オーガモータ５には掘削攪拌装置１のロッド６が取り付けられ、このロッド６の下部に水平掘削部７と垂直掘削部８とが設けられている。 Hereinafter, an excavation stirring device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 1, in the excavation and agitation device 1 according to this embodiment, a high support column 4 is vertically installed at the tip of a base machine 3 that can be moved by a caterpillar 2, and an auger motor 5 slides vertically on the support column 4. It is possible to install. A rod 6 of the excavation stirring device 1 is attached to the auger motor 5, and a horizontal excavation portion 7 and a vertical excavation portion 8 are provided below the rod 6.

前記掘削攪拌装置１のロッド６は、図１に示されるように、前記オーガモータ５に減速ギヤ（図示せず）等を介して連結される回転ロッド９と、この回転ロッド９の外周を被覆するガイドパイプ１０とからなる。このガイドパイプ１０は、上端部がオーガモータ５のケーシングに固定され、下端部付近が前記支柱４から延びる振止用のホルダ１１にスライド可能に保持されることで、前記回転ロッド９の回転とは切り離されている。なお、図２に示されるように、前記回転ロッド９の内側には全体を通じて中空部１２が形成されており、この中空部１２を介してセメントミルクなどの土壌硬化材が掘削穴に供給される。 As shown in FIG. 1, the rod 6 of the excavation and agitation device 1 covers a rotary rod 9 connected to the auger motor 5 via a reduction gear (not shown) and the outer periphery of the rotary rod 9. It consists of a guide pipe 10. The guide pipe 10 has its upper end fixed to the casing of the auger motor 5 and has its lower end near the lower end slidably held by a holder 11 for vibration isolation extending from the support column 4, thereby preventing the rotation rod 9 from rotating. It has been separated. As shown in FIG. 2, a hollow portion 12 is formed throughout the inside of the rotary rod 9, and a soil hardening material such as cement milk is supplied to the excavation hole through the hollow portion 12. ..

前記ロッド６の下端には水平掘削部７が設けられている。この水平掘削部７は、図２及び図４に示されるように、前記回転ロッド９の先端部で水平方向に回転する一対の水平回転翼１３と、この水平回転翼１３の長手方向に沿って取り付けられる複数個の第１掘削刃１４とを有する。水平回転翼１３は、細長い平板１３ａの下面にリブ１３ｂを突出させたものであり、その基部が回転中心となる柄部１３ｃに固定されている。 A horizontal excavation part 7 is provided at the lower end of the rod 6. As shown in FIGS. 2 and 4, the horizontal excavation unit 7 includes a pair of horizontal rotary blades 13 that horizontally rotate at the tip of the rotary rod 9 and a longitudinal direction of the horizontal rotary blades 13. And a plurality of first drilling blades 14 attached. The horizontal rotary blade 13 is formed by protruding a rib 13b on the lower surface of an elongated flat plate 13a, and its base is fixed to a handle 13c serving as a rotation center.

前記柄部１３ｃからは、一対の水平回転翼１３が対向する２方向にそれぞれ水平方向に延びており、各水平回転翼１３の前記リブ１３ｂに３個の第１掘削刃１４が着脱自在に装着されている。各第１掘削刃１４は、刃先が鋭角にとがった平面刃１４ａを有しており、この平面刃１４ａが前記水平回転翼１３の長手方向と平行になるように装着されている。各第１掘削刃１４は、水平回転翼１３の水平方向の回転に伴って一緒に回転し、平面刃１４ａによって掘削穴の底面を円形に掘削していく。なお、この実施形態では水平回転翼１３に３個の第１掘削刃１４が装着された場合を説明しているが、この第１掘削刃１４の数は３個に限定されないものであり、また掘削穴の大きさに応じて水平回転翼１３の長さも変わるので、それに応じて第１掘削刃１４の数も変わることになる。 From the handle portion 13c, a pair of horizontal rotary blades 13 extend horizontally in two opposite directions, and three first excavating blades 14 are detachably attached to the ribs 13b of each horizontal rotary blade 13. Has been done. Each of the first excavating blades 14 has a flat blade 14a having a sharp edge, and the flat blade 14a is mounted so as to be parallel to the longitudinal direction of the horizontal rotary blade 13. Each 1st excavation blade 14 rotates together with the horizontal rotation of the horizontal rotary blade 13, and the bottom face of an excavation hole is excavated circularly by the plane blade 14a. In addition, in this embodiment, the case where the three first digging blades 14 are attached to the horizontal rotary blade 13 is described, but the number of the first digging blades 14 is not limited to three, and Since the length of the horizontal rotary blade 13 also changes according to the size of the drilled hole, the number of the first drilling blades 14 also changes accordingly.

前記水平掘削部７の少し上方には垂直掘削部８が配置される。この垂直掘削部８は、図２及び図４に示されるように、前記ロッド６を挟んで左右両側に配置され、垂直方向に回転する垂直回転翼１５と、この垂直回転翼１５の長手方向に沿って取り付けられる複数個の第２掘削刃１６とを有する。前記垂直回転翼１５は、回転中心となる柄部１５ａから十字状に延びる４枚の細長い矩形状の平板１５ｂを有し、この平板１５ｂの一方の長辺１５ｃ（垂直回転翼が回転する方向の前側）には３個の第２掘削刃１６が着脱自在に装着されている。なお、図２に示されるように、垂直回転翼１５は、水平回転翼１３のほぼ先端部分の上方に配置されている。 A vertical excavation section 8 is arranged slightly above the horizontal excavation section 7. As shown in FIGS. 2 and 4, the vertical excavation unit 8 is arranged on both left and right sides of the rod 6 and has a vertical rotary blade 15 that rotates in the vertical direction and a vertical rotary blade 15 in the longitudinal direction. And a plurality of second cutting blades 16 mounted along the same. The vertical rotary blade 15 has four elongated rectangular flat plates 15b extending in a cross shape from the shaft portion 15a which is the center of rotation, and one long side 15c of the flat plate 15b (in the direction in which the vertical rotary blade rotates). On the front side), three second excavating blades 16 are detachably attached. Note that, as shown in FIG. 2, the vertical rotor 15 is arranged substantially above the tip of the horizontal rotor 13.

各第２掘削刃１６は、前記第１掘削刃１４と同様、刃先が鋭角にとがった平面刃１６ａを有しているが、前記第１掘削刃１４の装着とは異なって、前記平面刃１６ａが垂直回転翼１５の長手方向と直交するように装着されている。そのため、垂直回転翼１５の垂直方向の回転に伴って一緒に回転することで、前記水平掘削部７で掘削した穴の側面を前記第２掘削刃１６の平面刃１６ａによって直線的に平らに掘削することができる。 Each of the second excavating blades 16 has a flat blade 16a with a sharp edge, like the first excavating blade 14, but unlike the mounting of the first excavating blade 14, the flat blade 16a is different. Are mounted so as to be orthogonal to the longitudinal direction of the vertical rotor 15. Therefore, by rotating together with the vertical rotary blades 15 in the vertical direction, the side surface of the hole excavated by the horizontal excavating unit 7 is linearly excavated by the plane blade 16a of the second excavating blade 16. can do.

さらに、この実施形態では、前記垂直回転翼１５が垂直方向に回転するときの垂直の平面１７に対して、４枚の垂直回転翼１５が互い違いに内側と外側に所定角度傾斜した状態で前記柄部１５ａに取り付けられている。すなわち、図４に示したように、４枚の垂直回転翼１５のうち、一方の対向する一対の垂直回転翼１５ｄが回転方向に対して内側に傾斜し、他方の対向する一対の垂直回転翼１５ｅが外側に傾斜している。また、この実施形態では、第２掘削刃１６が垂直回転翼１５の平板１５ｂに真っ直ぐに延びた状態で装着されているので、前記垂直回転翼１５と同じ角度で第２掘削刃１６も前記平面１７に対して傾斜することになる。このように、第２掘削刃１６が前記平面１７に対して内側と外側とに傾斜した状態で取り付けられていることで、角形の掘削穴をより確実に掘り進めることができる。 Further, in this embodiment, the handle is provided in a state where the four vertical rotors 15 are alternately tilted inward and outward by a predetermined angle with respect to a vertical plane 17 when the vertical rotors 15 rotate in the vertical direction. It is attached to the portion 15a. That is, as shown in FIG. 4, among the four vertical rotors 15, one pair of vertical rotors 15d facing each other inclines inward with respect to the rotation direction, and the other pair of vertical rotors 15 facing each other. 15e is inclined outward. Further, in this embodiment, since the second excavating blade 16 is mounted on the flat plate 15b of the vertical rotary blade 15 in a state of being extended straight, the second excavating blade 16 is also flat at the same angle as the vertical rotary blade 15. It will be inclined with respect to 17. As described above, since the second excavating blade 16 is attached to the plane 17 in a state of being inclined inward and outward, it is possible to more reliably excavate the rectangular excavating hole.

なお、この実施形態では垂直回転翼１５の平板１５ｂに第２掘削刃１６を真っ直ぐに延びた状態で装着しているので、垂直回転翼１５と第２掘削刃１６とが同じ傾斜角度になっているが、垂直回転翼１５を前記平面１７と平行となるように柄部１５ａに取り付け、少なくとも第２掘削刃１６のみを前記平面１７に対して傾斜させてもよい。また、１枚の垂直回転翼１５に装着される第２掘削刃１６の数も３個に限定されないのは、前記第１掘削刃１４の場合と同様である。 In addition, in this embodiment, since the second excavating blade 16 is attached to the flat plate 15b of the vertical rotary blade 15 in a state of being extended straight, the vertical rotary blade 15 and the second excavating blade 16 have the same inclination angle. However, the vertical rotor 15 may be attached to the handle 15a so as to be parallel to the plane 17, and at least only the second excavating blade 16 may be inclined with respect to the plane 17. Further, the number of the second excavating blades 16 mounted on one vertical rotary blade 15 is not limited to three, as in the case of the first excavating blades 14.

前記垂直掘削部８の近傍には、前記回転ロッド９の水平方向の回転を垂直方向の回転に動力伝達して前記垂直掘削部８に垂直方向の回転力を付与する動力変換部２０が設けられている。この動力変換部２０は、前記動力伝達を行うための機械要素２１と、この機械要素２１をカバーする保護ケース２２とを備えている。前記機械要素２１として、この実施形態では傘状歯車が用いられている。この傘状歯車は、図２及び図３に示されるように、前記回転ロッド９に取り付けられる上下一対の主傘歯車２３，２４と、前記主傘歯車２３，２４と噛み合い前記主傘歯車の回転に伴って回転する左右一対の従傘歯車２５，２６とを備えている。一対の主傘歯車２３，２４は回転ロッド９に取り付けられることで回転ロッド９と一体に回転するが、特にこの実施形態では上側主傘歯車２３が回転ロッド９に固定されている一方、下側主傘歯車２４の方は回転ロッド９との間に含油軸受２７ａとスラストベアリング２８を配することで、回転ロッド９と縁切りがなされている。そのため、掘削時に回転ロッド９の軸方向に働く力をスラストベアリング２８によって受け止め、下側主傘歯車２４が柔軟に動き得るので、傘状歯車の主傘歯車２３，２４と従傘歯車２５，２６の噛み合いによる回転トラブルを避けることができる。なお、このスラストベアリングによる機構を上側主歯車２３側に設けても同様の効果が得られる。 In the vicinity of the vertical excavation unit 8, a power conversion unit 20 is provided that transmits the rotation of the rotating rod 9 in the horizontal direction to the rotation in the vertical direction to impart a vertical rotational force to the vertical excavation unit 8. ing. The power conversion unit 20 includes a mechanical element 21 for transmitting the power and a protective case 22 that covers the mechanical element 21. In this embodiment, a bevel gear is used as the mechanical element 21. As shown in FIGS. 2 and 3, the bevel gear has a pair of upper and lower main bevel gears 23 and 24 attached to the rotating rod 9 and a rotation of the main bevel gear that meshes with the main bevel gears 23 and 24. And a pair of left and right sub-bevel gears 25 and 26 that rotate in accordance with the above. The pair of main bevel gears 23, 24 rotates integrally with the rotating rod 9 by being attached to the rotating rod 9. In particular, in this embodiment, the upper main bevel gear 23 is fixed to the rotating rod 9, while the lower side The main bevel gear 24 has an oil-impregnated bearing 27 a and a thrust bearing 28 arranged between the main bevel gear 24 and the main shaft 24, so that the main rod gear 24 is cut off from the rotary rod 9. Therefore, the force acting in the axial direction of the rotating rod 9 during excavation is received by the thrust bearing 28, and the lower main bevel gear 24 can move flexibly, so that the main bevel gears 23, 24 and the sub-bevel gears 25, 26 of the bevel gears can be moved. Rotation trouble due to the meshing of can be avoided. The same effect can be obtained even if the mechanism by the thrust bearing is provided on the upper main gear 23 side.

一方、前記一対の主傘歯車２３，２４の左右側に配置される一対の従傘歯車２５，２６は、前記主傘歯車２３，２４と噛み合うように配置されると共に、前記垂直回転翼１５の回転軸２９に一体に固定されている。図３に示されるように、前記回転軸２９はラジアルベアリング３０を介して動力変換部２０の保護ケース２２に回転可能に支持されている。また、前記回転軸２９の先端部と回転ロッド９との間には前記と同様の含油軸受２７ｂとセンターカラー３１が配されると共に、このセンターカラー３１と回転軸２９の先端部との間にはラジアルベアリング３２が配され、回転軸２９のスムーズな回転を確保している。 On the other hand, the pair of secondary bevel gears 25, 26 arranged on the left and right sides of the pair of main bevel gears 23, 24 are arranged so as to mesh with the main bevel gears 23, 24, and at the same time, of the vertical rotary blade 15. It is integrally fixed to the rotary shaft 29. As shown in FIG. 3, the rotary shaft 29 is rotatably supported by the protective case 22 of the power conversion unit 20 via a radial bearing 30. Further, an oil-impregnated bearing 27b and a center collar 31 similar to those described above are arranged between the tip of the rotary shaft 29 and the rotary rod 9, and between the center collar 31 and the tip of the rotary shaft 29. Is provided with a radial bearing 32 to ensure smooth rotation of the rotary shaft 29.

前記傘状歯車をカバーする保護ケース２２は、図２乃至図４に示されるように、断面形状が略四角形の筒型形状をしており、上端の取付フランジ３５がガイドパイプ１０の取付フランジ３６にボルト３７で固定されることで、ガイドパイプ１０に一体に固定されている。また、図２に示されるように、保護ケース２２の下部２２ａはやや先細形状に形成されており、回転ロッド９との間に装着されたオイルシールによって保護ケース２２内に充填されたオイルの漏出を防いでいる。さらに、保護ケース２２の中央部には前記垂直回転翼１５の回転軸２９を支持するための腕部３８が左右に突出している。この腕部３８は、前述したように、回転軸２９を回転可能に支持するラジアルベアリング３０を内蔵すると共に、回転軸２９の挿通孔３９が先端に設けられている。 As shown in FIGS. 2 to 4, the protective case 22 that covers the bevel gear has a tubular shape with a substantially square cross section, and the mounting flange 35 at the upper end is the mounting flange 36 of the guide pipe 10. It is fixed to the guide pipe 10 integrally by being fixed to the guide pipe 10 with the bolt 37. Further, as shown in FIG. 2, the lower portion 22a of the protective case 22 is formed in a slightly tapered shape, and leakage of oil filled in the protective case 22 due to an oil seal mounted between the protective case 22 and the rotary rod 9. Is preventing. Further, an arm portion 38 for supporting the rotary shaft 29 of the vertical rotary blade 15 projects leftward and rightward in the central portion of the protective case 22. As described above, the arm portion 38 incorporates the radial bearing 30 that rotatably supports the rotating shaft 29, and has the insertion hole 39 of the rotating shaft 29 at the tip thereof.

次に、上記構成からなる掘削攪拌装置１の作用について説明する。ベースマシーン３によって掘削攪拌装置１を掘削現場まで運んでセットしたのち、前記オーガモータ５を駆動することで回転ロッド９を回転させる。この回転ロッド９の回転によって水平掘削部７の水平回転翼１３が水平方向に回転し、水平回転翼１３に装着されている第１掘削刃１４によって軟弱地盤を掘削していく。また、前記回転ロッド９に固定されている傘状歯車の上側主傘歯車２３及び回転ロッド９に含油軸受２７ａによって支持されている下側主傘歯車２４が回転ロッド９と一緒に回転し、左右の従傘歯車２５，２６に回転力を伝達する。従傘歯車２５，２６の回転によって保護ケース２２に支持されている回転軸２９が回転し、この回転軸２９の先端に取り付けられた垂直掘削部８の垂直回転翼１５が垂直方向に回転する。この時、左右の垂直回転翼１５は互いに反対方向に回転する。なお、従傘歯車２５，２６の回転軸２９が保護ケース２２に回転支持されているので、従傘歯車２５，２６が主傘歯車２３，２４の回りを公転することなく、定位置で自転する。そのため、垂直回転翼１５は垂直方向に回転するのみで、ロッド６の回りを水平回転することがない。 Next, the operation of the excavation and agitation device 1 having the above configuration will be described. After the excavation stirrer 1 is carried to the excavation site by the base machine 3 and set, the auger motor 5 is driven to rotate the rotary rod 9. The rotation of the rotary rod 9 causes the horizontal rotary blade 13 of the horizontal excavation unit 7 to rotate in the horizontal direction, and the first excavating blade 14 attached to the horizontal rotary blade 13 excavates the soft ground. Further, the upper main bevel gear 23 of the bevel gear fixed to the rotating rod 9 and the lower main bevel gear 24 supported by the oil-impregnated bearing 27a on the rotating rod 9 rotate together with the rotating rod 9, The rotational force is transmitted to the sub-bevel gears 25 and 26. The rotating shaft 29 supported by the protective case 22 is rotated by the rotation of the sub-bevel gears 25 and 26, and the vertical rotor blades 15 of the vertical excavating unit 8 attached to the tip of the rotating shaft 29 are rotated in the vertical direction. At this time, the left and right vertical rotors 15 rotate in opposite directions. Since the rotating shaft 29 of the sub-bevel gears 25 and 26 is rotatably supported by the protective case 22, the sub-bevel gears 25 and 26 do not revolve around the main bevel gears 23 and 24 but rotate at a fixed position. .. Therefore, the vertical rotor blades 15 only rotate in the vertical direction, and do not horizontally rotate around the rod 6.

前記垂直回転翼１５に装着されている第２掘削刃１６は、垂直回転翼１５が垂直方向に回転することで、前記水平回転翼１３の第１掘削刃１４によって掘削された円形穴の内周壁を削り取るようにして掘削していく。図５は、第１掘削刃１４によって掘削される円形穴４０の外形と、第２掘削刃１６によって掘削される角形穴４１の外形を示す模式図である。まず、第１掘削刃１４で所定の深さまで地盤に円形穴４０を掘削していく。このとき、左右の垂直回転翼１５が垂直方向に回転することによって、円形穴４０の左右の内周壁を削り取るように掘り進むことで、四面とも略平らな側壁４２ａ、４２ｂ、４２ｃ、４２ｄが形成され、角形穴４１を形成することができる。四面の側壁のうち、向かい合う二面の側壁４２ａ，４２ｂだけを前記垂直回転翼１５の第２掘削刃１６で直接削り取り、残りの向かい合う二面の側壁４２ｃ，４２ｄは直接に削り取ることはないが、前述したように、第２掘削刃１６が互い違いに外側と内側とに傾斜しているために、垂直回転翼１５の先端部に取り付けられた外側に傾斜した第２掘削刃１６ｂと内側に傾斜した第２掘削刃１６ｃとによって、円形穴４０の内周壁の対向する４カ所の壁土４３を巻き込むようにして削り取ることで、円形穴４０の内周壁に４カ所の角部４４が形成される。その結果、垂直回転翼１５によって直接掘削される側壁４２ａ，４２ｂだけでなく、垂直回転翼１５によって直接には掘削されない側の側壁４２ｃ、４２ｄもほぼ平らな壁面となって、結果的には略平らな四つの側壁４２ａ、４２ｂ、４２ｃ、４２ｄを有する角形穴４１が形成されることになる。 The second excavating blade 16 mounted on the vertical rotor 15 has an inner peripheral wall of a circular hole excavated by the first excavating blade 14 of the horizontal rotor 13 as the vertical rotor 15 rotates in the vertical direction. Excavate as if scraping away. FIG. 5 is a schematic diagram showing the outer shape of the circular hole 40 excavated by the first excavating blade 14 and the outer shape of the square hole 41 excavated by the second excavating blade 16. First, the circular hole 40 is excavated in the ground by the first excavating blade 14 to a predetermined depth. At this time, the left and right vertical rotary blades 15 rotate in the vertical direction to dig into the left and right inner peripheral walls of the circular hole 40 so that the four side walls 42a, 42b, 42c, and 42d are substantially flat. The square hole 41 can be formed. Of the four side walls, only the two side walls 42a, 42b facing each other are directly scraped off by the second excavating blade 16 of the vertical rotor 15, while the remaining two side walls 42c, 42d facing each other are not directly scraped off. As described above, since the second digging blades 16 are alternately inclined to the outside and the inside, the second digging blades 16b attached to the tip of the vertical rotor 15 and inclined to the inside are inclined to the outside. The second excavating blade 16c forms the four corners 44 on the inner peripheral wall of the circular hole 40 by scraping off the wall soil 43 at the four opposite positions on the inner peripheral wall of the circular hole 40 so as to be rolled up. As a result, not only the side walls 42a and 42b directly excavated by the vertical rotor 15 but also the side walls 42c and 42d on the side not directly excavated by the vertical rotor 15 become substantially flat wall surfaces, and as a result, A square hole 41 having four flat side walls 42a, 42b, 42c, 42d will be formed.

上述のようにして水平掘削部７と垂直掘削部８とで所定の深さまで角形穴４１を掘削したのち、オーガモータ５を支柱４に沿って上方にスライドさせていく。この時、回転ロッド９の回転をそのまま持続することで、水平回転翼１３及び垂直回転翼１５を回転させながら引き上げることができる。この引き上げ作業に連動して回転ロッド９の中空部１２を通じて硬化材としてのセメントミルクが供給される。掘削穴内では回転ロッド９の先端に設けられた吐出口９ａから供給されたセメントミルクと、掘削された土砂とが掘削穴内で攪拌混合されて凝固され角形の地中杭を造成していく。セメントミルクと土砂との攪拌混合は、前記水平掘削部７の水平回転翼１３と、垂直掘削部８の垂直回転翼１５とによって行われるが、この実施形態では垂直回転翼１５の平板１５ｂが、垂直回転翼１５が回転する際の垂直の平面１７に対して傾斜しているので、セメントミルクと掘削された土砂との攪拌混合がより十分になされると同時に、垂直回転翼１５が回転しながら上昇する際に、傾斜した平板１５ｂによって掘削穴の側壁４２ａ，４２ｂ，４２ｃ，４２ｄの形を整えながら凝固させていくので、結果的に四角柱の地中杭が造成されることになる。 After the rectangular hole 41 is excavated to a predetermined depth by the horizontal excavation unit 7 and the vertical excavation unit 8 as described above, the auger motor 5 is slid upward along the support column 4. At this time, by continuing the rotation of the rotary rod 9 as it is, the horizontal rotary blade 13 and the vertical rotary blade 15 can be pulled up while rotating. In conjunction with this pulling up operation, cement milk as a hardening material is supplied through the hollow portion 12 of the rotary rod 9. In the excavation hole, the cement milk supplied from the discharge port 9a provided at the tip of the rotary rod 9 and the excavated earth and sand are stirred and mixed in the excavation hole to be solidified to form a square underground pile. Stirring and mixing of the cement milk and the earth and sand are performed by the horizontal rotary blade 13 of the horizontal excavation unit 7 and the vertical rotary blade 15 of the vertical excavation unit 8. In this embodiment, the flat plate 15b of the vertical rotary blade 15 is Since the vertical rotor 15 is inclined with respect to the vertical plane 17 when rotating, the stirring and mixing of the cement milk and the excavated earth and sand is more sufficiently performed, and at the same time the vertical rotor 15 rotates. When climbing, the inclined flat plate 15b solidifies the side walls 42a, 42b, 42c, 42d of the excavation hole while adjusting the shapes thereof, so that a quadrangular pillar underground pile is formed.

以上、本発明の好ましい実施例が述べられてきたが、本発明は、これら実施例に限定されず、種々の変形および変更がこれら実施例になされ得ることを認識されるべきである。 Although the preferred embodiments of the present invention have been described above, it should be appreciated that the present invention is not limited to these embodiments and that various modifications and changes can be made to these embodiments.

１掘削攪拌装置
２キャタピラ
３ベースマシーン
４支柱
５オーガモータ
６ロッド
７水平掘削部
８垂直掘削部
９回転ロッド
９ａ吐出口
１０ガイドパイプ
１１ホルダ
１２中空部
１３水平回転翼
１３ａ平板
１３ｂリブ
１３ｃ柄部
１４第１掘削刃
１４ａ平面刃
１５垂直回転翼
１５ａ柄部
１５ｂ平板
１５ｃ長辺
１６第２掘削刃
１６ａ平面刃
１６ｂ外側
１６ｃ内側
１７垂直の平面
２０動力変換部
２１機械要素
２２保護ケース
２２ａ下部
２３，２４主傘歯車
２５，２６従傘歯車
２７ａ，２７ｂ含油軸受
２８スラストベアリング
２９回転軸
３０，３２ラジアルベアリング
３１センターカラー
３５，３６取付フランジ
３７ボルト
３８腕部
３９挿通孔
４０円形穴
４１角形穴
４２側壁
４３壁土
４４角部 1 Excavator/Agitator 2 Caterpillar 3 Base Machine 4 Support 5 Auger Motor 6 Rod 7 Horizontal Excavator 8 Vertical Excavator 9 Rotating Rod 9a Discharge Port 10 Guide Pipe 11 Holder 12 Hollow 13 Horizontal Rotor 13a Flat Plate 13b Rib 13c Handle 14th 1 Excavation Blade 14a Plane Blade 15 Vertical Rotating Blade 15a Handle 15b Flat Plate 15c Long Side 16 Second Excavation Blade 16a Flat Blade 16b Outside 16c Inside 17 Vertical Plane 20 Power Converter 21 Machine Element 22 Protective Case 22a Lower 23,24 Main Bevel gears 25, 26 Secondary bevel gears 27a, 27b Oil-impregnated bearings 28 Thrust bearings 29 Rotating shafts 30, 32 Radial bearings 31 Center collars 35, 36 Mounting flanges 37 Bolts 38 Arms 39 Insert holes 40 Circular holes 41 Square holes 42 Side walls 43 Wall clay 44 corner

Claims

A pillar vertically erected at the tip of the base machine that can be moved by moving means,
An auger motor attached to the pillar so as to be vertically slidable,
A rotating rod of an excavating stirring device mounted in a guide pipe vertically slidably mounted on the casing of the auger motor, and a lower end portion of the auger motor is slidably mounted through a holder for vibration isolation extending from the column.
A horizontal excavation unit which is provided at the tip of the rotating rod and rotates in the horizontal direction together with the rotating rod,
A vertical excavation section arranged above the horizontal excavation section,
A mechanical element for transmitting the rotation of the rotating rod to give a vertical rotating force to the vertical excavation unit,
The vertical excavation unit includes a protective case of a mechanical element connected to a lower end of a guide pipe covering the outer circumference of the rotating rod, and the protective case is integrally fixed to the guide pipe separated from the rotation of the rotating rod. And
A bevel gear that constitutes the mechanical element includes a pair of upper and lower main bevel gears attached to the rotating rod, and a pair of left and right sub-bevel gears that mesh with the main bevel gear and rotate with the rotation of the main bevel gear. At least one of the pair of main bevel gears rotates integrally with the rotating rod by being attached to the rotating rod, and the other main bevel gear has the oil-impregnated bearing and the thrust bearing arranged between the rotating rod and the main bevel gear. Since the edge is cut with the rotating rod, and therefore the force acting in the axial direction of the rotating rod during excavation is received by the thrust bearing, and the other main bevel gear can move flexibly, the main bevel gear and the sub bevel gear of the bevel gear are An excavator and agitator characterized in that rotation troubles due to meshing can be avoided .

The excavating and stirring apparatus according to claim 1, wherein a hollow portion is provided inside the rotary rod, and a discharge port of a hardening material supplied through the hollow portion is provided at a tip end portion of the rotary rod.

The vertical excavation unit includes a plurality of vertical rotors and a second excavating blade attached to the plurality of vertical rotors, and at least the second excavating blade is vertical when the vertical rotors rotate in a vertical direction. The excavating and stirring apparatus according to claim 1, wherein the excavating and stirring apparatus is attached at a predetermined inclination angle with respect to a flat plane.

The second excavating blades to which the plurality of vertical rotor blades are attached are, in adjacent vertical rotor blades, attached to one vertical rotor blade at an inclination angle outward with respect to the vertical plane, and to the other vertical rotor blades. The excavation and agitation device according to claim 3, wherein the excavation and agitation device is attached to the vertical plane at an inclining angle to the vertical plane.

The vertical excavation unit includes a plurality of flat plate-shaped vertical rotary blades and a second drilling blade attached to the flat plate-shaped vertical rotary blades. The excavating and stirring apparatus according to claim 1, wherein the vertical rotary blade is attached at a predetermined inclination angle with respect to a vertical plane when the vertical rotary blade rotates in the vertical direction.