JP2009249921A - Excavation shaft connection method and structure for soil improving apparatus - Google Patents

Excavation shaft connection method and structure for soil improving apparatus Download PDF

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JP2009249921A
JP2009249921A JP2008099499A JP2008099499A JP2009249921A JP 2009249921 A JP2009249921 A JP 2009249921A JP 2008099499 A JP2008099499 A JP 2008099499A JP 2008099499 A JP2008099499 A JP 2008099499A JP 2009249921 A JP2009249921 A JP 2009249921A
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shaft
outer shaft
excavation
constituent body
ground improvement
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JP4767989B2 (en
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Masataka Honda
政孝 本多
Koki Takakura
功樹 高倉
Hiroshi Maruoka
宏至 丸岡
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Epokoramu Kiko KK
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Epokoramu Kiko KK
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  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excavation shaft connection method and structure for connecting an excavation shaft like a double pipe safely and smoothly. <P>SOLUTION: This soil improving apparatus is constituted by forming the excavation shaft 13 by an inner shaft 15 and an outer shaft 16 rotating relatively in the opposite directions like the double pipe, forming the excavation shaft 13 by a plurality of inner and outer shaft constituent bodies 35, 36 constituted by connecting the inner and outer shafts 15, 16 mutually and vertically, and forming stirring blades 14 in the inner and outer shaft constituent bodies 35, 36 at lower ends, respectively. The inner shaft constituent body 35 is connected with the outer shaft constituent body 36 fixed on the ground surface from the outside of the outer shaft constituent body 36 to regulate vertical movement of the inner shaft constituent body 35 and connect the upper and lower inner and outer shaft constituent bodies 35, 36 mutually in the state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、掘削軸を相対的に反対方向へ向けて回転する内軸と外軸とで二重管状に形成するとともに、各内外軸を上下に接続した複数本の内外軸構成体で形成し、下端の内外軸構成体に撹拌翼をそれぞれ形成した地盤改良装置において、掘削軸を接続する方法及びその構造に関するものである。   In the present invention, the excavation shaft is formed into a double tubular shape with an inner shaft and an outer shaft rotating in opposite directions, and the inner and outer shafts are formed by a plurality of inner and outer shaft structures connected vertically. Further, the present invention relates to a method for connecting excavation shafts and a structure thereof in a ground improvement device in which stirring blades are respectively formed on inner and outer shaft components at the lower end.

従来より、軟弱地盤の強化や汚染地盤の浄化などを目的として、土壌を掘削しながら掘削した土壌中に地盤改良剤（固化剤や浄化剤など）を吐出し、地盤改良剤と土壌とを撹拌混合することによって地盤の改良を行っている。   Conventionally, for the purpose of strengthening soft ground or purifying contaminated ground, ground improvement agents (solidifying agents, purification agents, etc.) are discharged into the excavated soil while excavating the soil, and the ground improvement agent and soil are agitated. The ground is improved by mixing.

この地盤改良作業においては、専用の地盤改良装置が用いられている（たとえば、特許文献１参照。）。この地盤改良装置は、回転モータに掘削軸の基端部を取付け、掘削軸の先端部に掘削した土壌を撹拌するための撹拌翼を形成し、撹拌翼の近傍に地盤改良剤を吐出するための改良剤吐出口を形成し、地盤改良剤を改良剤吐出口から土壌中に吐出し、地盤改良剤と掘削した土壌とを撹拌翼によって撹拌混合するようにしている。   In this ground improvement work, a dedicated ground improvement device is used (for example, refer to Patent Document 1). This ground improvement device attaches the base end of the excavation shaft to the rotary motor, forms a stirring blade for agitating the excavated soil at the tip of the excavation shaft, and discharges the ground improvement agent in the vicinity of the stirring blade The ground improver is discharged into the soil from the improver outlet, and the ground improver and the excavated soil are stirred and mixed by a stirring blade.

この地盤改良装置では、地盤改良剤と土壌との撹拌混合を良好に行わせるために、掘削軸を相対的に反対方向へ向けて回転する内軸と外軸とで二重管状に形成するとともに、各内外軸の下端部に撹拌翼をそれぞれ形成したものが開発されている。   In this ground improvement device, in order to perform agitation and mixing of the ground improvement agent and the soil, the excavation shaft is formed into a double tubular shape with an inner shaft and an outer shaft rotating in opposite directions. In addition, a type in which a stirring blade is formed at the lower end of each inner and outer shaft has been developed.

また、地盤改良装置では、必要に応じて地面を深く掘削できるようにするために、各内外軸を上下に接続した複数本の内外軸構成体で形成し、内外軸構成体を継ぎ足すことができるようにしたものが開発されている。   Also, in the ground improvement device, in order to be able to excavate the ground deeply as needed, each inner and outer shaft can be formed by a plurality of inner and outer shaft constituents connected vertically, and the inner and outer shaft constituents can be added. What has been made possible is being developed.

特開２００５−１３９７８８号公報JP 2005-139788 A

ところが、掘削軸を内外軸で二重管状に形成した上記従来の地盤改良装置では、外軸の内部に内軸が収容された構成となっているために、内軸構成体を継ぎ足すときに外軸構成体が邪魔になって円滑に掘削軸の接続作業を行うことが困難であった。   However, in the above conventional ground improvement device in which the excavation shaft is formed into a double tubular shape with the inner and outer shafts, the inner shaft is accommodated inside the outer shaft, so when the inner shaft structure is added. It was difficult to smoothly connect the excavation shaft because the outer shaft structure was in the way.

そのため、従来の地盤改良装置では、回転モータと掘削軸との接続部分に外軸構成体を上下にスライドさせるスライド機構を設け、このスライド機構によって外軸構成体を内軸構成体からずらすことで掘削軸の接続を行うようにしたものが開発されていた。   Therefore, in the conventional ground improvement device, a slide mechanism that slides the outer shaft constituent body up and down is provided at the connection portion between the rotary motor and the excavating shaft, and the outer shaft constituent body is displaced from the inner shaft constituent body by the slide mechanism. The thing which connected the excavation axis was developed.

しかしながら、この地盤改良装置では、スライド機構が回転モータと掘削軸との接続部分に設けられていたために、掘削軸の接続作業が高所での作業となってしまい、安全性に問題があった。   However, in this ground improvement device, since the slide mechanism is provided at the connection portion between the rotary motor and the excavation shaft, the excavation shaft connection work becomes a work at a high place, and there is a problem in safety. .

また、従来の地盤改良装置では、上下の内軸構成体を接続ピンで接続する構成とするとともに、接続ピンを外部から挿通できるようにするための貫通孔を外軸構成体に形成して、上下の内外軸構成体を外軸構成体の外部から接続することで掘削軸の接続を行うようにしたものも開発されていた。   In addition, in the conventional ground improvement device, the upper and lower inner shaft components are configured to be connected by connection pins, and through holes for allowing the connection pins to be inserted from the outside are formed in the outer shaft components, There has also been developed a structure in which the excavation shaft is connected by connecting the upper and lower inner and outer shaft components from outside the outer shaft component.

しかしながら、この地盤改良装置では、内外軸がそれぞれ独立して反対方向に回転するように構成しているために、外軸の内部に内軸が遊嵌された状態となっており、上下の内外軸構成体を切り離してしまうと下側の内軸構成体が自重で下方に落下してしまう。それを防止するために、内軸と外軸の間に上下方向の動きを規制するとともに回転方向は自由なベアリング機構を備えた内外軸一体型の軸体を撹拌翼と内外軸構成体の間に設けている。これにより、内軸構成体が自重で落下しないため、継足し作業が可能であった。しかし、このベアリング機構を備えた内外軸一体型の軸体は、施工中の振動等の影響により、ベアリング部の損耗・磨耗が激しく、また、メンテナンスにおいて、内外軸一体型の軸体である為に、交換・修理作業を行う場合、外軸部分を解体し内軸部分を引き抜いて作業を行わなければならず、非常に手間と費用がかかっていた。   However, in this ground improvement device, since the inner and outer shafts are configured to rotate independently in opposite directions, the inner shaft is loosely fitted inside the outer shaft, and the upper and lower inner and outer shafts are If the shaft constituent body is cut off, the lower inner shaft constituent body falls downward due to its own weight. In order to prevent this, the shaft body integrated with the inner and outer shafts with the bearing mechanism that restricts the vertical movement between the inner shaft and the outer shaft and is free to rotate between the agitating blade and the inner and outer shaft components. Provided. As a result, the inner shaft component does not fall due to its own weight, so that the addition work can be performed. However, the inner / outer shaft integrated type shaft body equipped with this bearing mechanism suffers from severe wear and wear of the bearing due to the influence of vibration during construction, etc. In addition, when performing replacement / repair work, it was necessary to dismantle the outer shaft portion and pull out the inner shaft portion, which was very laborious and expensive.

このように、掘削軸を内外軸で二重管状に形成した上記従来の地盤改良装置にあっては、内外軸構成体を継ぎ足すことによる掘削軸の接続作業を安全かつ円滑に行うことが困難であるといった課題を有していた。   As described above, in the conventional ground improvement device in which the excavation shaft is formed into a double tubular shape with the inner and outer shafts, it is difficult to safely and smoothly connect the excavation shaft by adding the inner and outer shaft components. It had the problem of being.

そこで、請求項１に係る本発明では、掘削軸を相対的に反対方向へ向けて回転する内軸と外軸とで二重管状に形成するとともに、各内外軸を上下に接続した複数本の内外軸構成体で形成し、下端の内外軸構成体に撹拌翼をそれぞれ形成した地盤改良装置の掘削軸接続方法において、地面に固定した外軸構成体に内軸構成体を外軸構成体の外部から連結して内軸構成体の上下動を規制し、その状態で上下の内外軸構成体をそれぞれ接続することにした。   Therefore, in the present invention according to claim 1, the excavation shaft is formed into a double tubular shape with an inner shaft and an outer shaft rotating in opposite directions, and a plurality of inner and outer shafts connected vertically. In the excavation shaft connection method of the ground improvement device formed by the inner and outer shaft constituents and the stirring blades respectively formed on the inner and outer shaft constituents at the lower end, the inner shaft constituents of the outer shaft constituents are fixed to the outer shaft constituents fixed to the ground. It was decided to connect the upper and lower inner and outer shaft components in this state by connecting from the outside to restrict the vertical movement of the inner shaft member.

また、請求項２に係る本発明では、前記請求項１に係る本発明において、外軸構成体に形成した貫通孔と内軸構成体に形成した係止溝とを連結ピンで係止することによって外軸構成体に内軸構成体を外軸構成体の外部から連結することにした。   Moreover, in this invention which concerns on Claim 2, in this invention which concerns on the said Claim 1, the through-hole formed in the outer-shaft structure body and the latching groove formed in the inner-shaft structure body are latched with a connection pin. Thus, the inner shaft constituent body is connected to the outer shaft constituent body from the outside of the outer shaft constituent body.

また、請求項３に係る本発明では、前記請求項１に係る本発明において、内軸構成体の上端外周面と外軸構成体の上端内周面との間に楔を嵌入することによって外軸構成体に内軸構成体を外軸構成体の外部から連結することにした。   According to a third aspect of the present invention, in the first aspect of the present invention, the outer shaft is formed by inserting a wedge between the upper outer peripheral surface of the inner shaft component and the upper inner peripheral surface of the outer shaft component. The inner shaft constituent body is connected to the shaft constituent body from the outside of the outer shaft constituent body.

また、請求項４に係る本発明では、掘削軸を相対的に反対方向へ向けて回転する内軸と外軸とで二重管状に形成するとともに、各内外軸を上下に接続した複数本の内外軸構成体で形成し、下端の内外軸構成体に撹拌翼をそれぞれ形成した地盤改良装置の掘削軸接続構造において、地面に固定した外軸構成体に内軸構成体を外軸構成体の外部から連結して内軸構成体の上下動を規制するための内外軸構成体連結機構を設けることにした。   Further, in the present invention according to claim 4, the excavation shaft is formed into a double tubular shape with an inner shaft and an outer shaft rotating in opposite directions, and a plurality of inner and outer shafts are connected vertically. In the excavation shaft connection structure of the ground improvement device formed by the inner and outer shaft constituents and the stirring blades formed on the inner and outer shaft constituents at the lower end, the inner shaft constituents of the outer shaft constituents are fixed to the outer shaft constituents fixed to the ground. An inner / outer shaft constituent body connecting mechanism for restricting the vertical movement of the inner shaft constituent body by being connected from the outside is provided.

また、請求項５に係る本発明では、前記請求項４に係る本発明において、前記内外軸構成体連結機構は、外軸構成体に形成した貫通孔と、内軸構成体に形成した係止溝と、これらの貫通孔と係止溝とを係止する連結ピンとで構成することにした。   Further, in the present invention according to claim 5, in the present invention according to claim 4, the inner / outer shaft constituent body coupling mechanism includes a through hole formed in the outer shaft constituent body and a locking formed in the inner shaft constituent body. The grooves and the connecting pins that lock the through holes and the locking grooves are used.

また、請求項６に係る本発明では、前記請求項４に係る本発明において、前記内外軸構成体連結機構は、内軸構成体の上端外周面と外軸構成体の上端内周面との間に嵌入する楔で構成することにした。   Moreover, in this invention which concerns on Claim 6, in this invention which concerns on the said Claim 4, the said inner / outer shaft structure connection mechanism is the upper end outer peripheral surface of an inner shaft structure and the upper end inner peripheral surface of an outer shaft structure. I decided to make it with wedges that fit in between.

そして、本発明では、以下に記載する効果を奏する。   And in this invention, there exists an effect described below.

すなわち、本発明では、地面に固定した外軸構成体に内軸構成体を外軸構成体の外部から連結して内軸構成体の上下動を規制し、その状態で上下の内外軸構成体をそれぞれ接続することにしているために、低所にて安全に掘削軸の接続作業を行うことができるとともに、ベアリング機構を備えた内外軸一体型の軸体を設ける必要も無いため、掘削軸の接続作業を安全且つ安価で円滑に行うことができる。   That is, in the present invention, the inner shaft constituent body is connected to the outer shaft constituent body fixed to the ground from the outside of the outer shaft constituent body to restrict the vertical movement of the inner shaft constituent body, and the upper and lower inner and outer shaft constituent bodies in this state are regulated. Therefore, it is possible to connect the excavation shaft safely in a low place, and it is not necessary to provide an inner / outer shaft integrated shaft body equipped with a bearing mechanism. Can be performed safely, inexpensively and smoothly.

以下に、本発明に係る地盤改良装置の具体的な構成について図面を参照しながら説明する。   Below, the concrete structure of the ground improvement apparatus which concerns on this invention is demonstrated, referring drawings.

図１に示すように、地盤改良装置１は、重機２の前端部に支柱３を立設し、この支柱３に掘削機構４を昇降自在に取付け、この掘削機構４に改良剤混合プラント５と水槽６と改良剤貯留タンク７と改良剤吐出ポンプ８とからなる改良剤供給機構59をスイベルジョイント９を介して連通連結している。   As shown in FIG. 1, the ground improvement device 1 has a support column 3 standing at the front end of a heavy machine 2, and a drilling mechanism 4 is attached to the support column 3 so as to be movable up and down. An improving agent supply mechanism 59 comprising a water tank 6, an improving agent storage tank 7 and an improving agent discharge pump 8 is connected in communication via a swivel joint 9.

掘削機構４は、支柱３の前側部に昇降支持体10を昇降自在に取付け、この昇降支持体10に駆動モータ11とこの駆動モータ11に連動連結した反転変速機12とを搭載し、この反転変速機12に掘削軸13の基端部を連動連結するとともに、掘削軸13の先端部に撹拌翼14を取付けている。   The excavation mechanism 4 has a lifting support 10 attached to the front side of the support column 3 so that it can be moved up and down. A driving motor 11 and a reversing transmission 12 linked to the driving motor 11 are mounted on the lifting support 10. A base end portion of the excavation shaft 13 is linked to the transmission 12 and a stirring blade 14 is attached to the distal end portion of the excavation shaft 13.

掘削軸13は、図２に示すように、同軸上に配置した中空円筒状の内軸15と外軸16とで二重管状に形成しており、反転変速機12に内軸15と外軸16とをそれぞれ独立して連動連結し、反転変速機12の作用によって内軸15と外軸16とが相対的に反対方向へ向けて回転するようにしている。この内軸15と外軸16の具体的な構造については後述する。   As shown in FIG. 2, the excavation shaft 13 is formed in a double tubular shape with a hollow cylindrical inner shaft 15 and an outer shaft 16 arranged coaxially, and the reversal transmission 12 includes an inner shaft 15 and an outer shaft. 16 are independently linked and linked so that the reverse transmission 12 causes the inner shaft 15 and the outer shaft 16 to rotate relatively in opposite directions. Specific structures of the inner shaft 15 and the outer shaft 16 will be described later.

撹拌翼14は、内軸15の先端部に形成した左右一対の先端側撹拌翼17と、外軸16の先端部に形成した左右一対の最内側撹拌翼18と、内軸15の先端側中途部に略コ字状に形成した左右一対の内側撹拌翼19と、外軸16の先端側中途部に円周方向に向けて120度間隔で略コ字状に形成した外側撹拌翼20とで構成している。   The stirring blade 14 includes a pair of left and right tip-side stirring blades 17 formed at the tip portion of the inner shaft 15, a pair of left and right innermost stirring blades 18 formed at the tip portion of the outer shaft 16, and a middle portion on the tip side of the inner shaft 15. A pair of left and right inner stirring blades 19 formed in a substantially U-shape at the center, and an outer stirring blade 20 formed in a substantially U-shape at an interval of 120 degrees in the circumferential direction at the front end side middle portion of the outer shaft 16 It is composed.

ここで、内軸15と外軸16とが反転変速機12によって相対的に反対方向へ向けて回転することから、内軸15に形成した先端側撹拌翼17と内側撹拌翼19は、外軸16に形成した最内側撹拌翼18と外側撹拌翼20とは相対的に反対方向へ向けて回転するようになっている。   Here, since the inner shaft 15 and the outer shaft 16 are rotated in the opposite directions relatively by the reverse transmission 12, the tip side stirring blade 17 and the inner stirring blade 19 formed on the inner shaft 15 are The innermost agitating blade 18 and the outer agitating blade 20 formed in 16 are rotated in a relatively opposite direction.

先端側撹拌翼17は、内軸15の先端外周面に板状の翼体21を傾斜状に取付け、この翼体21の下端側部に複数個の掘削ビット22を間隔をあけて取付けるとともに、翼体21の上方に改良剤吐出口23を形成している。なお、改良剤吐出口23は、内軸15の中空部を介して地盤改良剤供給機構８に連通している。   The tip side agitating blade 17 is attached to the outer peripheral surface of the tip of the inner shaft 15 with a plate-like wing body 21 in an inclined manner, and a plurality of excavation bits 22 are attached to the lower end side portion of the wing body 21 at intervals. An improving agent discharge port 23 is formed above the wing body 21. The improver discharge port 23 communicates with the ground improver supply mechanism 8 through the hollow portion of the inner shaft 15.

最内側撹拌翼18は、外軸16の先端外周面に板状の翼体24を傾斜状に取付けている。   The innermost stirring blade 18 has a plate-like blade body 24 attached to the outer peripheral surface of the tip of the outer shaft 16 in an inclined manner.

内側撹拌翼19は、下端部を内軸15の外周面に取付けるとともに、上端部に環状体25を取付け、この環状体25を外軸16の外周面に遊嵌している。また、内側撹拌翼19は、外側面と内側面と上側面とに板状の小翼片26,27,28をそれぞれ取付けている。さらに、内側撹拌翼19は、内軸15との間に連結翼片29を取付け、連結翼片29に改良剤吐出口30を形成している。なお、改良剤吐出口30は、内軸15の中空部を介して地盤改良剤供給機構８に連通している。   The inner stirring blade 19 has a lower end portion attached to the outer peripheral surface of the inner shaft 15 and an annular body 25 attached to the upper end portion, and the annular body 25 is loosely fitted to the outer peripheral surface of the outer shaft 16. The inner stirring blade 19 has plate-shaped small blade pieces 26, 27, and 28 attached to the outer surface, the inner surface, and the upper surface, respectively. Further, the inner stirring blade 19 has a connecting blade piece 29 attached to the inner shaft 15, and the improving agent discharge port 30 is formed in the connecting blade piece 29. The improver discharge port 30 communicates with the ground improver supply mechanism 8 through the hollow portion of the inner shaft 15.

外側撹拌翼20は、上端部を外軸16の外周面に取付けるとともに、下端部に環状体31を取付け、この環状体31を内軸15の外周面に遊嵌している。また、外側撹拌翼20は、内側面に板状の小翼片32,33を取付けている。   The outer stirring blade 20 has an upper end portion attached to the outer peripheral surface of the outer shaft 16 and an annular body 31 attached to the lower end portion, and the annular body 31 is loosely fitted to the outer peripheral surface of the inner shaft 15. The outer stirring blade 20 has plate-shaped small blade pieces 32 and 33 attached to the inner surface.

この撹拌翼14は、掘削軸13の先端部にシールロッド34を介して取付けられており、このシールロッド34によって掘削した土砂が掘削軸13の内部に侵入しないようにしている。   The agitating blade 14 is attached to the tip of the excavation shaft 13 via a seal rod 34 so that earth and sand excavated by the seal rod 34 does not enter the excavation shaft 13.

次に、本発明の要部となる内軸15及び外軸16（掘削軸13）の具体的な構造について説明する。   Next, a specific structure of the inner shaft 15 and the outer shaft 16 (excavation shaft 13), which is a main part of the present invention, will be described.

掘削軸13は、外軸16の中空部に内軸15を回転自在かつ上下動自在に収容した構成となっており、各内外軸15,16を上下に接続した内外軸構成体35,36で継ぎ足し可能に構成している。   The excavation shaft 13 has a configuration in which the inner shaft 15 is accommodated in a hollow portion of the outer shaft 16 so as to be rotatable and movable up and down, and the inner and outer shaft components 35 and 36 in which the inner and outer shafts 15 and 16 are connected vertically. It can be added.

内軸構成体35は、図３に示すように、上端部に断面視で六角形状の接続凸部37を形成するとともに、接続凸部37の左右側面に断面視で半円弧状の接続溝38を水平に形成し、一方、下端部に断面視で六角形孔状の接続凹部39を形成するとともに、接続凹部39の外周面に断面視で半円弧状の接続孔40を貫通状に形成している。   As shown in FIG. 3, the inner shaft constituting body 35 is formed with a hexagonal connection convex portion 37 in the cross-sectional view at the upper end portion, and on the left and right side surfaces of the connection convex portion 37, a semicircular connection groove 38 in the cross-sectional view. On the other hand, a hexagonal hole-shaped connection recess 39 is formed in the lower end portion in cross-sectional view, and a semicircular arc-shaped connection hole 40 is formed in the outer peripheral surface of the connection recess 39 in a cross-sectional view in a penetrating manner. ing.

そして、内軸15は、上方側の内軸構成体35の接続凹部39に下方側の内軸構成体35の接続凸部37を挿入するとともに、接続孔40から挿入した接続ピン41で接続溝38と接続孔40とを係止することで、上下の内軸構成体35,35を接続できるようになっている（図４参照。）。   The inner shaft 15 is inserted into the connecting concave portion 39 of the upper inner shaft constituting body 35 with the connecting convex portion 37 of the lower inner shaft constituting body 35 and connected with the connecting pin 41 inserted from the connecting hole 40. By engaging 38 and the connection hole 40, the upper and lower inner shaft components 35, 35 can be connected (see FIG. 4).

この内軸構成体35には、接続凸部37の下側外周面に係止溝42を形成している。   The inner shaft constituting body 35 is formed with a locking groove 42 on the lower outer peripheral surface of the connecting convex portion 37.

外軸構成体36は、図３に示すように、上端部にスプライン軸状の接続凸部43を形成するとともに、接続凸部43の左右側面に断面視で半円弧状の接続溝44を水平に形成し、一方、下端部にスプライン軸孔状の接続凹部45を形成するとともに、接続凹部45に接続孔46を貫通状に形成している。   As shown in FIG. 3, the outer shaft constituting body 36 has spline shaft-like connection convex portions 43 formed at the upper end portion, and horizontal connection grooves 44 in the cross-sectional view are horizontally formed on the left and right side surfaces of the connection convex portion 43. On the other hand, a spline shaft hole-like connection recess 45 is formed at the lower end, and a connection hole 46 is formed in the connection recess 45 in a penetrating manner.

そして、外軸16は、上方側の外軸構成体36の接続凹部45に下方側の外軸構成体36の接続凸部43を挿入するとともに、接続孔46から挿入した接続ピン47で接続溝44と接続孔46とを係止することで、上下の外軸構成体36,36を接続できるようになっている（図４参照。）。   The outer shaft 16 is inserted into the connecting concave portion 45 of the lower outer shaft constituting body 36 by the connecting convex portion 43 of the lower outer shaft constituting body 36 and connected by the connecting pin 47 inserted from the connecting hole 46. By locking 44 and the connection hole 46, the upper and lower outer shaft components 36, 36 can be connected (see FIG. 4).

この外軸構成体36には、接続凸部43の下側外周面に貫通状の挿通孔48を内軸構成体35に形成した接続溝38と対向する位置に形成するとともに、接続凸部43の下側外周面に縦長の貫通孔49を内軸構成体35に形成した係止溝42と対向する位置に形成し、これらの挿通孔48及び貫通孔49に蓋体50,51を着脱自在に螺着している。   In the outer shaft constituting body 36, a through hole 48 is formed on the lower outer peripheral surface of the connecting convex portion 43 at a position facing the connecting groove 38 formed in the inner shaft constituting body 35, and the connecting convex portion 43 A vertically long through hole 49 is formed on the lower outer peripheral surface of the inner shaft constituting body 35 at a position facing the locking groove 42 formed in the inner shaft constituting body 35, and the lid bodies 50 and 51 can be freely attached to and detached from the insertion hole 48 and the through hole 49. Screwed on.

また、外軸構成体36には、中途部外周面にリング状の鍔体52を形成している。   Further, the outer shaft constituting body 36 is formed with a ring-shaped casing 52 on the outer peripheral surface of the middle portion.

このように、掘削軸13は、外軸構成体36の外周面に貫通状の挿通孔48を内軸構成体35に形成した接続溝38と対向する位置に形成しているために、外軸16（外軸構成体36）の外部から内軸15（内軸構成体35）を接続できるようになっている。   Thus, the excavation shaft 13 is formed with a through-hole 48 in the outer peripheral surface of the outer shaft constituting body 36 at a position facing the connection groove 38 formed in the inner shaft constituting body 35. The inner shaft 15 (inner shaft component 35) can be connected from the outside of 16 (outer shaft member 36).

また、掘削軸13は、外軸構成体36の外周面に貫通孔49を内軸構成体35に形成した係止溝42と対向する位置に形成しているために、貫通孔49から挿入した連結ピン53で係止溝42と貫通孔49とを係止することで、外軸構成体36（掘削軸13）の外部から外軸構成体36に内軸構成体35を連結して内軸構成体35の上下動を規制させることができるようになっている（図４及び図５参照。）。   The excavation shaft 13 is inserted through the through-hole 49 because the through-hole 49 is formed on the outer peripheral surface of the outer shaft constituting body 36 at a position facing the locking groove 42 formed in the inner shaft constituting body 35. By locking the locking groove 42 and the through hole 49 with the connecting pin 53, the inner shaft component 35 is connected to the outer shaft component 36 from the outside of the outer shaft component 36 (excavation shaft 13). The vertical movement of the structure 35 can be regulated (see FIGS. 4 and 5).

地盤改良装置１は、以上に説明したように構成しており、以下に説明するようにして掘削軸13を継ぎ足すことができるようになっている。   The ground improvement device 1 is configured as described above, and the excavation shaft 13 can be added as described below.

掘削軸13を継ぎ足す場合には、掘削軸13を切り離し、その後、掘削軸13を接続する。   When the excavation shaft 13 is added, the excavation shaft 13 is disconnected and then the excavation shaft 13 is connected.

そして、掘削軸13を切り離す場合には、まず、図４に示すように、地面54を掘削することによって地中に埋設した状態で外軸構成体36の鍔体52と地面54との間に支持板55を介設して地面54に外軸構成体36を固定する。   When the excavating shaft 13 is cut off, first, as shown in FIG. 4, the ground 54 is excavated between the housing 52 and the ground 54 of the outer shaft constituting body 36 while being buried in the ground. The outer shaft constituting body 36 is fixed to the ground 54 with a support plate 55 interposed therebetween.

次に、外軸構成体36から蓋体50,51を外し、挿通孔48及び貫通孔49を露出させ、貫通孔49から連結ピン53を挿入し、連結ピン53によって内軸構成体35の係止溝42と外軸構成体36の貫通孔49とを係止させる。このときに、連結ピン53の下部と縦長の貫通孔49の内周部との間に楔56を打ち込むことで、内軸構成体35の上下位置を微調整することができる。これにより、内軸構成体35は、外軸構成体36に連結され、上下動が規制されることになる。   Next, the lids 50 and 51 are removed from the outer shaft constituting body 36, the insertion hole 48 and the through hole 49 are exposed, the connecting pin 53 is inserted from the through hole 49, and the inner pin constituting body 35 is engaged by the connecting pin 53. The stop groove 42 and the through hole 49 of the outer shaft component 36 are locked. At this time, the vertical position of the inner shaft constituting body 35 can be finely adjusted by driving the wedge 56 between the lower portion of the connecting pin 53 and the inner peripheral portion of the vertically long through hole 49. As a result, the inner shaft constituting body 35 is connected to the outer shaft constituting body 36 and the vertical movement is restricted.

次に、外軸構成体36の接続孔46から接続ピン47を外し、外軸構成体36の挿通孔48から内軸構成体35の接続ピン41を外す。これにより、上下の内外軸構成体35,36を上下に分離することができる。このときに、地面54に固定された外軸構成体36に内軸構成体35を連結しているために、内軸構成体35が自重によって落下するのを防止することができる。   Next, the connection pin 47 is removed from the connection hole 46 of the outer shaft component 36, and the connection pin 41 of the inner shaft component 35 is removed from the insertion hole 48 of the outer shaft component 36. Thereby, the upper and lower inner and outer shaft constituting bodies 35 and 36 can be separated vertically. At this time, since the inner shaft component 35 is connected to the outer shaft component 36 fixed to the ground 54, it is possible to prevent the inner shaft component 35 from falling due to its own weight.

掘削軸13を接続する場合には、切り離しによって図５に示す状態となっているため、上記した切り離しと逆の手順で行うことができる。   When the excavation shaft 13 is connected, since it is in the state shown in FIG. 5 by the separation, it can be performed in the reverse procedure to the above-described separation.

なお、外軸構成体36から内軸構成体35を上方に持ち上げることができる場合には、図６に示すように、内軸構成体35の上端外周面と外軸構成体36の上端内周面との間に左右一対の円弧断面を有する楔57,57を嵌入することによって、内軸構成体35の自重を利用して外軸構成体36に内軸構成体35を連結して、内軸構成体35の上下動を規制させることができ、この状態で、内軸構成体35と外軸構成体36とを順に接続することができる。   When the inner shaft component 35 can be lifted upward from the outer shaft component 36, as shown in FIG. 6, the upper end outer peripheral surface of the inner shaft component 35 and the upper inner periphery of the outer shaft component 36 are shown. By inserting wedges 57, 57 having a pair of left and right circular cross sections between the inner surface and the inner surface, the inner shaft constituent body 35 is connected to the outer shaft constituent body 36 by utilizing its own weight. The vertical movement of the shaft component 35 can be restricted, and in this state, the inner shaft component 35 and the outer shaft component 36 can be connected in order.

実際の施工現場においては、図７に示すように、まず、継ぎ足す掘削軸13の下端に掘削ビット58を取付けて、所定位置に継ぎ足す掘削軸13を埋設し（図７(a)）、その後、所定の深さまで掘削し（図７(b)）、その後、上記したようにして掘削軸13を切り離すとともに、所定位置に埋設した掘削軸13を接続し（図７(c)）、その後、埋設した掘削軸13を引き抜くとともに掘削ビット58を取外し、上記したようにして掘削軸13を接続し（図７(d)）、その後、所定の深さまで掘削する（図７(e)）。なお、掘削時には、掘削機構４の先端側撹拌翼17に形成した掘削ビット22によって地盤を掘削しながら掘り進み、地盤の内部において改良剤吐出口23,30から圧縮空気とともに地盤改良剤を土壌中に吐出するとともに、撹拌翼14によって土壌と地盤改良剤とを混合撹拌して、地盤の改良を行うようにしている。   At the actual construction site, as shown in FIG. 7, first, a drill bit 58 is attached to the lower end of the drilling shaft 13 to be added, and the drilling shaft 13 to be added at a predetermined position is buried (FIG. 7 (a)). After that, excavation to a predetermined depth (FIG. 7 (b)), and then the excavation shaft 13 is cut off as described above and the excavation shaft 13 embedded in a predetermined position is connected (FIG. 7 (c)). Then, the buried excavation shaft 13 is pulled out and the excavation bit 58 is removed, and the excavation shaft 13 is connected as described above (FIG. 7 (d)), and then excavated to a predetermined depth (FIG. 7 (e)). At the time of excavation, the ground is excavated by the excavation bit 22 formed on the tip side agitating blade 17 of the excavation mechanism 4 and the ground improver is introduced into the soil together with the compressed air from the improver discharge ports 23 and 30 inside the ground. In addition, the ground is improved by mixing and stirring the soil and the ground improvement agent by the stirring blade 14.

また、図８に示すように、所定の深さまで掘削した後に（図８(a)）、掘削軸13を所定の高さまで引き上げ（図８(b)）、その後、上記したようにして掘削軸13を切り離すとともに、先端に掘削ビット58を取付けて、所定位置に掘削軸13を埋設し（図８(c)）、その後、埋設した掘削軸13を切り離すとともに、先に切り離した掘削軸13を接続し（図８(d)）、その後、掘削軸13を地上まで引き上げる（図８(e)）。   Further, as shown in FIG. 8, after excavating to a predetermined depth (FIG. 8 (a)), the excavating shaft 13 is pulled up to a predetermined height (FIG. 8 (b)), and then the excavating shaft as described above. 13 and the excavation bit 58 is attached to the tip, and the excavation shaft 13 is buried at a predetermined position (FIG. 8 (c)). Thereafter, the excavation shaft 13 is separated and the excavation shaft 13 previously separated is attached. Then, the excavation shaft 13 is pulled up to the ground (FIG. 8 (e)).

以上に説明したように、上記地盤改良装置１では、地面54に固定した外軸構成体36に内軸構成体35を外軸構成体36の外部から連結して内軸構成体35の上下動を規制し、その状態で上下の内外軸構成体35,36をそれぞれ切り離し又は接続するようにしている。   As described above, in the ground improvement device 1, the inner shaft constituent body 35 is connected to the outer shaft constituent body 36 fixed to the ground 54 from the outside of the outer shaft constituent body 36 to move the inner shaft constituent body 35 up and down. In this state, the upper and lower inner and outer shaft components 35 and 36 are disconnected or connected.

そのため、上記地盤改良装置１では、低所にて安全に掘削軸13の接続作業を行うことができるとともに、ベアリング機構を備えた内外軸一体型の軸体を設ける必要も無いため、掘削軸13の接続作業を安全且つ安価で円滑に行うことができる。   Therefore, in the ground improvement device 1, the excavation shaft 13 can be safely connected in a low place, and it is not necessary to provide an inner / outer shaft integrated shaft body having a bearing mechanism. Can be performed safely, inexpensively and smoothly.

本発明に係る地盤改良装置を示す全体説明図。BRIEF DESCRIPTION OF THE DRAWINGS Whole explanatory drawing which shows the ground improvement apparatus which concerns on this invention. 撹拌翼を示す断面側面図。The cross-sectional side view which shows a stirring blade. 掘削軸を示す側面図(a)及び断面図(b)(c)。The side view (a) and sectional drawing (b) (c) which show an excavation axis. 掘削軸の接続方法を示す側面図(a)及び断面図(b)(c)。The side view (a) and sectional drawing (b) (c) which show the connection method of a digging shaft. 掘削軸の接続方法を示す側面図(a)及び断面図(b)(c)。The side view (a) and sectional drawing (b) (c) which show the connection method of a digging shaft. 掘削軸の接続方法を示す側面図(a)及び断面図(b)(c)。The side view (a) and sectional drawing (b) (c) which show the connection method of a digging shaft. 掘削軸の接続作業を示す説明図。Explanatory drawing which shows the connection operation | work of a digging shaft. 掘削軸の接続作業を示す説明図。Explanatory drawing which shows the connection operation | work of a digging shaft.

符号の説明Explanation of symbols

１ 地盤改良装置 ２ 重機
３ 支柱 ４ 掘削機構
５ 改良剤混合プラント ６ 水槽
７ 改良剤貯留タンク ８ 改良剤吐出ポンプ
９ スイベルジョイント 10 昇降支持体
11 駆動モータ 12 反転変速機
13 掘削軸 14 撹拌翼
15 内軸 16 外軸
17 先端側撹拌翼 18 最内側撹拌翼
19 内側撹拌翼 20 外側撹拌翼
21 翼体 22 掘削ビット
23 改良剤吐出口 24 翼体
25 環状体 26,27,28 小翼片
29 連結翼片 30 改良剤吐出口
31 環状体 32,33 小翼片
34 シールロッド 35 内軸構成体
36 外軸構成体 37 接続凸部
38 接続溝 39 接続凹部
40 接続孔 41 接続ピン
42 係止溝 43 接続凸部
44 接続溝 45 接続凹部
46 接続孔 47 接続ピン
48 挿通孔 49 貫通孔
50,51 蓋体 52 鍔体
53 連結ピン 54 地面
55 支持板 56 楔
57 楔 58 掘削ビット
59 改良剤供給機構 DESCRIPTION OF SYMBOLS 1 Ground improvement device 2 Heavy machine 3 Strut 4 Excavation mechanism 5 Improvement agent mixing plant 6 Water tank 7 Improvement agent storage tank 8 Improvement agent discharge pump 9 Swivel joint 10 Lifting support
11 Drive motor 12 Reverse transmission
13 Drilling shaft 14 Stirring blade
15 Inner shaft 16 Outer shaft
17 Tip side stirring blade 18 Innermost stirring blade
19 Inner stirring blade 20 Outer stirring blade
21 Wings 22 Drilling bits
23 Improving agent outlet 24 Wing body
25 Annulus 26, 27, 28 Small winglet
29 Linkage blade 30 Improvement agent discharge port
31 Annulus 32,33 Small winglet
34 Seal rod 35 Inner shaft component
36 Outer shaft component 37 Connection projection
38 Connection groove 39 Connection recess
40 Connection hole 41 Connection pin
42 Locking groove 43 Convex protrusion
44 Connection groove 45 Connection recess
46 Connection hole 47 Connection pin
48 Insertion hole 49 Through hole
50,51 Lid 52 Enclosure
53 Connecting pin 54 Ground
55 Support plate 56 Wedge
57 wedge 58 drill bit
59 Improving agent supply mechanism

Claims (6)

掘削軸を相対的に反対方向へ向けて回転する内軸と外軸とで二重管状に形成するとともに、各内外軸を上下に接続した複数本の内外軸構成体で形成し、下端の内外軸構成体に撹拌翼をそれぞれ形成した地盤改良装置の掘削軸接続方法であって、
地面に固定した外軸構成体に内軸構成体を外軸構成体の外部から連結して内軸構成体の上下動を規制し、その状態で上下の内外軸構成体をそれぞれ接続することを特徴とする地盤改良装置の掘削軸接続方法。 The excavation shaft is formed into a double tubular shape with an inner shaft and an outer shaft that rotate in opposite directions, and each inner and outer shaft is formed by a plurality of inner and outer shaft components connected vertically, and the inner and outer ends of the lower end are formed. An excavation shaft connection method for a ground improvement device in which stirring blades are respectively formed on a shaft structure,
Connecting the inner shaft component from the outside of the outer shaft component to the outer shaft member fixed to the ground to regulate the vertical movement of the inner shaft member, and connecting the upper and lower inner and outer shaft members in this state. A ground excavation shaft connecting method for a ground improvement device. 外軸構成体に形成した貫通孔と内軸構成体に形成した係止溝とを連結ピンで係止することによって外軸構成体に内軸構成体を外軸構成体の外部から連結することを特徴とする請求項１に記載の地盤改良装置の掘削軸接続方法。   Connecting the inner shaft component to the outer shaft component from the outside of the outer shaft component by locking the through-hole formed in the outer shaft component and the locking groove formed in the inner shaft component with a connecting pin. The excavation shaft connecting method of the ground improvement device according to claim 1. 内軸構成体の上端外周面と外軸構成体の上端内周面との間に楔を嵌入することによって外軸構成体に内軸構成体を外軸構成体の外部から連結することを特徴とする請求項１に記載の地盤改良装置の掘削軸接続方法。   The inner shaft constituent body is connected to the outer shaft constituent body from the outside of the outer shaft constituent body by inserting a wedge between the upper end outer peripheral surface of the inner shaft constituent body and the upper end inner peripheral surface of the outer shaft constituent body. The excavation shaft connection method of the ground improvement device according to claim 1. 掘削軸を相対的に反対方向へ向けて回転する内軸と外軸とで二重管状に形成するとともに、各内外軸を上下に接続した複数本の内外軸構成体で形成し、下端の内外軸構成体に撹拌翼をそれぞれ形成した地盤改良装置の掘削軸接続構造であって、
地面に固定した外軸構成体に内軸構成体を外軸構成体の外部から連結して内軸構成体の上下動を規制するための内外軸構成体連結機構を設けたことを特徴とする地盤改良装置の掘削軸接続構造。 The excavation shaft is formed into a double tubular shape with an inner shaft and an outer shaft that rotate in opposite directions, and each inner and outer shaft is formed by a plurality of inner and outer shaft components connected vertically, and the inner and outer ends of the lower end are formed. Excavation shaft connection structure of a ground improvement device in which a stirring blade is formed on each of the shaft components,
An inner / outer shaft constituent body coupling mechanism for restricting the vertical movement of the inner shaft constituent body by connecting the inner shaft constituent body from the outside of the outer shaft constituent body to the outer shaft constituent body fixed to the ground is provided. Excavation shaft connection structure for ground improvement equipment. 前記内外軸構成体連結機構は、外軸構成体に形成した貫通孔と、内軸構成体に形成した係止溝と、これらの貫通孔と係止溝とを係止する連結ピンとで構成したことを特徴とする請求項４に記載の地盤改良装置の掘削軸接続構造。   The inner / outer shaft constituent body coupling mechanism is constituted by a through hole formed in the outer shaft constituent body, a locking groove formed in the inner shaft constituent body, and a connecting pin for locking the through hole and the locking groove. The excavation shaft connection structure of the ground improvement device according to claim 4. 前記内外軸構成体連結機構は、内軸構成体の上端外周面と外軸構成体の上端内周面との間に嵌入する楔で構成したことを特徴とする請求項４に記載の地盤改良装置の掘削軸接続構造。   5. The ground improvement according to claim 4, wherein the inner / outer shaft constituent body coupling mechanism is configured by a wedge fitted between an upper end outer peripheral surface of the inner shaft constituent body and an upper end inner peripheral surface of the outer shaft constituent body. Equipment excavation shaft connection structure.
JP2008099499A 2008-04-07 2008-04-07 Excavation shaft connection method and excavation shaft connection structure for ground improvement device Active JP4767989B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011226170A (en) * 2010-04-21 2011-11-10 Osaka Marine Co Ltd Agitating blade structure for ground improvement device or the like
JP7385788B1 (en) 2023-10-03 2023-11-22 あおみ建設株式会社 Connection structure and connection method of shafts of soil improvement equipment

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JPH0379331A (en) * 1989-08-23 1991-04-04 Sanwa Kako Kk Manufacture of polyolefin foamed material
JP2002363969A (en) * 2001-06-07 2002-12-18 Epokoramu Kiko Kk Ground improving system
JP2004092840A (en) * 2002-09-03 2004-03-25 Mory Industries Inc Expansion section wedge type fixing apparatus in expansion double pipe
JP2007162418A (en) * 2005-12-16 2007-06-28 Onoda Chemico Co Ltd Coupling for working shaft

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JPH0379331A (en) * 1989-08-23 1991-04-04 Sanwa Kako Kk Manufacture of polyolefin foamed material
JP2002363969A (en) * 2001-06-07 2002-12-18 Epokoramu Kiko Kk Ground improving system
JP2004092840A (en) * 2002-09-03 2004-03-25 Mory Industries Inc Expansion section wedge type fixing apparatus in expansion double pipe
JP2007162418A (en) * 2005-12-16 2007-06-28 Onoda Chemico Co Ltd Coupling for working shaft

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011226170A (en) * 2010-04-21 2011-11-10 Osaka Marine Co Ltd Agitating blade structure for ground improvement device or the like
JP7385788B1 (en) 2023-10-03 2023-11-22 あおみ建設株式会社 Connection structure and connection method of shafts of soil improvement equipment

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