JP3657926B2 - Ground improvement device - Google Patents

Ground improvement device Download PDF

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JP3657926B2
JP3657926B2 JP2002179114A JP2002179114A JP3657926B2 JP 3657926 B2 JP3657926 B2 JP 3657926B2 JP 2002179114 A JP2002179114 A JP 2002179114A JP 2002179114 A JP2002179114 A JP 2002179114A JP 3657926 B2 JP3657926 B2 JP 3657926B2
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excavation
improved material
improved
shaft
shaft body
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JP2004019371A (en
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満生 原
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エポコラム機工株式会社
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Description

【0001】
【発明の属する技術分野】
本発明は、地盤改良装置に関する。
【0002】
【従来の技術】
従来、地盤を改良する地盤改良装置の一形態として、掘削軸体の下部周面に撹拌翼体を取り付けると共に、同掘削軸体の下端部に掘削刃体を取り付け、掘削軸体の下端部である掘削刃体の中央部ないしは掘削軸体の下部外周面に改良材吐出部を設けたものがある。
【0003】
そして、かかる地盤改良装置では、掘削軸体を介して掘削刃体を回転させることにより、同掘削刃体により地盤を掘削しながら地盤中に掘進させると共に、上記掘削刃体と一体的に回転する撹拌翼体により掘削土を攪拌し、かつ、改良材吐出部より改良材を吐出して、掘削土と改良材とを混練するようにしている。
【0004】
ここで、改良材としては、汚染土壌を処理する処理材やセメントペースト等の固化材を使用して、地盤を改良するようにしている。
【0005】
【発明が解決しようとする課題】
ところが、上記した地盤改良装置では、改良材吐出部を掘削軸体の下端部である掘削刃体の中央部ないしは掘削軸体の下部外周面に設けているために、かかる改良材吐出部から吐出された改良材が、撹拌翼体により撹拌されているにもかかわらず、掘削刃体により掘削された掘削面の外周縁部まで改良材が行き届き難いという不具合がある。
【0006】
そのため、理想的には掘削土と改良材とが均質に混練されて柱状の地盤改良土が形成されるはずであるが、現実的には地盤改良土の周縁部に改良材が十分に混練されていないという不具合がある。
【0007】
【課題を解決するための手段】
そこで、本発明では、上下方向に伸延する掘削軸体と、同掘削軸体の下端部に設けた掘削刃体とを具備する地盤改良装置において、掘削刃体は、掘削軸体の下端部より半径方向に伸延させて形成した支持片と、同支持片の先端部に取り付けた筒状の掘削刃本片と、同掘削刃本片の下端縁部より下方へ突設した複数の掘削ビットを具備し、上記掘削刃本片に、内方である掘削軸体の方向へ向けて改良材を吐出する改良材内方吐出部を設けたことを特徴とする地盤改良装置を提供するものである。
【0008】
また、本発明は、以下の構成にも特徴を有する。
【0009】
(1)掘削軸体の近傍位置から外方へ向けて改良材を吐出する改良材外方吐出部を設けたこと。
【0010】
(2)掘削軸体に、同掘削軸体の半径方向に伸延する攪拌翼体を設け、同撹拌翼体により各吐出部より吐出された改良材を撹拌するようにしたこと。
【0011】
【発明の実施の形態】
以下に、本発明の実施の形態について説明する。
【0012】
すなわち、本発明に係る地盤改良装置は、基本的構造として、上下方向に伸延する掘削軸体と、同掘削軸体の下端部に設けた掘削刃体とを具備している。
【0013】
そして、特徴的構造として、掘削刃体の最外側部の近傍位置から内方である掘削軸体の方向へ向けて改良材を吐出する改良材内方吐出部を設けている。
【0014】
しかも、掘削軸体の近傍位置から外方へ向けて改良材を吐出する改良材外方吐出部を設けている。
【0015】
また、掘削軸体に、同掘削軸体の半径方向に伸延する攪拌翼体を設け、同撹拌翼体により各吐出部より吐出された改良材を撹拌するようにしている。
【0016】
【実施例】
以下に、本発明の実施例を、図面を参照しながら説明する。
【0017】
〔第1実施例〕
図1に示すAは、第1実施例としての改良材吐出構造を具備する本発明に係る地盤改良装置であり、同地盤改良装置Aは、ベースマシン1と改良材供給部2とを装備している。
【0018】
ベースマシン1は、図1に示すように、自走可能なベースマシン本体3に上下方向に伸延するリーダ4を設け、同リーダ4にモータ支持体5を昇降自在に取り付け、同モータ支持体5に駆動用モータ6を搭載し、同駆動用モータ6に上下方向に伸延する掘削軸体7の上端部を二重反転歯車機構8を介して着脱自在に取り付け、同掘削軸体7の下端部に掘削刃体10を取り付けている。
【0019】
改良材供給部2は、図1及び図2に示すように、改良材収容タンクと改良材供給ポンプ(図示しない)とを具備し、同改良材供給ポンプに第1・第2改良材供給ホースh1,h2の基端部を接続し、各改良材供給ホースh1,h2の先端部をスイベルジョイント等の第1・第2ホース接続体j1,j2を介して前記掘削軸体7に接続している。ここで、改良材としては、汚染土壌を処理するための処理材やセメントペースト等の固化材を使用することができる。
【0020】
掘削軸体7は、図2及び図3にも示すように、上下方向に伸延させて形成した筒状の軸体11を二重反転歯車機構8を介して駆動用モータ6に連動連結して、同駆動用モータ6により軸体11をその軸芯廻りに回転させることができるようにしている。
【0021】
そして、軸体11中には上下方向に伸延させて形成した筒状体12を挿通して、同筒状体12中に第1改良材供給路r1を形成し、同筒状体12の外周面と軸体11の内周面との間に第2改良材供給路r2を形成している。
【0022】
しかも、筒状体12の上端部と、軸体11の上端部とに、それぞれ第1・第2ホース接続体j1,j2を設けて、各ホース接続体j1,j2と前記した改良材供給部2との間に、前記した第1・第2改良材供給ホースh1,h2を介設して、同改良材供給部2より各改良材供給ホースh1,h2→各ホース接続体j1,j2→各改良材供給路r1,r2に改良材を供給することができるようにしている。
【0023】
上記のような構成において、第1実施例としての改良材吐出構造は、軸体11の下端部に改良材外方吐出部13と掘削刃体10とを設けており、同改良材外方吐出部13は、軸体11の下端部の周壁に改良材外方吐出孔13a,13aを形成すると共に、筒状体12の下端部の周壁に前記改良材外方吐出孔13a,13aと連通する連通孔13b,13bを形成して、各改良材外方吐出孔13a,13aを連通孔13b,13bを介して第1改良材供給路r1に連通させている。
【0024】
このようにして、第1改良材供給路r1を通して供給される改良材を、改良材外方吐出孔13a,13aより軸体11の半径方向(外方向a)へ向けて吐出させるようにしている。
【0025】
掘削刃体10は、図2及び図3に示すように、軸体11の下端部より半径方向に伸延させて形成した左右一対の支持片10a,10aと、両支持片10a,10aの先端部間に取り付けた筒状の掘削刃本片10bと、同掘削刃本片10bの下端縁部より下方へ突設した複数の掘削ビット10cを具備しており、軸体11と同軸的にかつ一体的に回転するようにしている。
【0026】
そして、左右一対の支持片10a,10a中には、その伸延方向に沿わせて改良材供給連通路14,14を形成し、各改良材供給連通路14,14の基端部を第2改良材供給路r2に連通させている。
【0027】
また、筒状の掘削刃本片10b中には、その軸線方向(上下方向)に沿わせて改良材吐出流路15,15を形成し、各改良材吐出流路15,15の基端部を前記改良材供給連通路14,14の先端部に連通させる一方、各改良材吐出流路15,15の先端部を掘削刃本片10bの内周壁に形成した改良材内方吐出部16,16の改良材内方吐出孔16a,16aに連通させている。
【0028】
このようにして、第2改良材供給路r2を通して供給される改良材を、改良材供給連通路14,14→改良材吐出流路15,15→改良材内方吐出孔16a,16aより軸体11側である内方向bへ吐出させるようにしている。
【0029】
上記のように構成した地盤改良装置Aにより地盤改良作業を行う際には、軸体11をその軸線廻りに回転させることにより、同軸体11の下端部に一体的に取り付けた掘削刃体10を同軸的に回転させて、地盤G中に掘進させる。
【0030】
この際、掘削刃体10の下端縁部に設けた掘削ビット10cにより地盤Gを掘削すると共に、改良材内方吐出孔16a,16aより改良材を内方向bへ向けて吐出させ、かつ、改良材外方吐出孔13a,13aより改良材を外方向aへ向けて吐出させて、掘削土壌中に改良材を均質に分散させて改良土壌gとなす。
【0031】
そして、筒状に形成した掘削刃本片10b内に掘削された掘削土壌には、改良材が内方と外方の両方向から吐出されると共に、掘削刃本片10bを支持する支持片10a,10aが掘削土壌と改良材とを撹拌する攪拌翼として機能するため、同掘削土壌中に改良材を均質に分散させることができて、地盤改良効果を良好に確保することができる。
【0032】
また、本実施例では、掘削軸体7の下端部に掘削刃体10を取り付けているだけであるため、地盤に水を供給して、同地盤を弛緩させることにより貫入抵抗を少なくするという作業を行う必要性がなく、特に、汚染土壌を改良材により改良する際に、掘削土壌の排出量を可及的に少なくすることができて、排出土壌の処理を行う必要性を少なくすることができ、その結果、排出土壌の処理コストを大幅に削減することができる。
【0033】
〔第2実施例〕
図4及び図5は、第2実施例としての改良材吐出構造を示しており、同改良材吐出構造は、前記した第1実施例としての改良材吐出構造と基本的構造を同じくしているが、筒状に形成した掘削刃本片10b内において、軸体11の下部に、同軸体11の半径方向に伸延する直状の撹拌翼体17,17を設けた点において異なる。
【0034】
そして、三本の支持片10a,10a,10aは、撹拌翼体17, 17の直上方位置において、外側下方へ下り傾斜状に配置して、これら撹拌翼体17,17との間に撹拌空間Sを形成している。
【0035】
また、撹拌翼体17,17は、改良材外方吐出孔13a,13a及び改良材内方吐出孔16a,16a,16aよりも上方位置に配置している。
【0036】
このようにして、掘削刃体10により掘削された掘削刃本片10b内の掘削土壌中に、改良材外方吐出孔13a,13a及び改良材内方吐出孔16a,16a,16aより改良材を吐出させ、その後に、撹拌翼体17,17により撹拌して、改良材を掘削土壌中に確実に均質分散させることができるようにしている。
【0037】
この際、撹拌翼体17,17と支持片10a,10a,10aとの間には撹拌空間Sを形成しているため、掘削土壌と改良材とを効率良く撹拌することができる。
【0038】
〔第3実施例〕
図6及び図7は、第3実施例としての改良材吐出構造を示しており、同改良材吐出構造は、前記した第2実施例としての改良材吐出構造と基本的構造を同じくしているが、掘削軸体7を内外側二重軸構造に構成して、内側軸20に改良材外方吐出部13と撹拌翼体17,17を設ける一方、外側軸21に掘削刃体10を設けると共に、同掘削刃体1 0に改良材内方吐出部16を設けた点において異なる。
【0039】
すなわち、掘削軸体7は、図6及び図7にも示すように、上下方向に伸延させて形成した筒状の内側軸20と、同内側軸20の外周を囲繞する状態に上下方向に伸延させて形成した筒状の外側軸21とから内外側二重軸構造に構成しており、内側軸20と外側軸21は、駆動用モータ6により二重反転歯車機構8を介して同一軸芯廻りに相互に反対方向に回転するようにしている。
【0040】
そして、内側軸20中に第1改良材供給路r1を形成し、同内側軸20の外周面と外側軸21の内周面との間に第2改良材供給路r2を形成している。
【0041】
しかも、内側軸20の上端部と、外側軸21の上端部とに、それぞれ第1・第2ホース接続体j1,j2を設けて、各ホース接続体j1,j2と前記した改良材供給部2との間に、前記した第1・第2改良材供給ホースh1,h2を介設して、同改良材供給部2より各改良材供給ホースh1,h2→各ホース接続体j1,j2→各改良材供給路r1,r2に改良材を供給することができるようにしている。
【0042】
このようにして、筒状に形成した掘削刃本片10b内に掘削された掘削土壌には、改良材が内方と外方の両方向から吐出されると共に、掘削刃本片10bを支持する支持片10a,10aが掘削土壌と改良材とを撹拌する攪拌翼として機能し、かつ、この撹拌翼体として機能する支持片10a,10aが攪拌翼体17,17と相互に反対方向に回転して、掘削土壌中に改良材をより一層均質に分散させることができて、地盤改良効果を向上させることができる。
【0043】
〔第4実施例〕
図8及び図9は、第4実施例としての改良材吐出構造を示しており、同改良材吐出構造は、前記した第3実施例としての改良材吐出構造と基本的構造を同じくしているが、内側軸20に改良材外方吐出部13と掘削刃体10を設けると共に、同掘削刃体10に改良材内方吐出部16を設ける一方、外側軸21に撹拌翼体17,17を設けた点において異なる。
【0044】
すなわち、掘削軸体7は、図8及び図9にも示すように、上下方向に伸延させて形成した筒状の内側軸20と、同内側軸20の外周を囲繞する状態に上下方向に伸延させて形成した筒状の外側軸21とから内外側二重軸構造に構成しており、内側軸20と外側軸21は、駆動用モータ6により二重反転歯車機構8を介して同一軸芯廻りに相互に反対方向に回転するようにしている。
【0045】
そして、内側軸20中には上下方向に伸延させて形成した筒状体12を挿通して、同筒状体12中に第1改良材供給路r1を形成し、同筒状体12の外周面と内側軸20の内周面との間に第2改良材供給路r2を形成している。
【0046】
しかも、筒状体12の上端部と、内側軸20の上端部とに、それぞれ第1・第2ホース接続体j1,j2を設けて、各ホース接続体j1,j2と前記した改良材供給部2との間に、前記した第1・第2改良材供給ホースh1,h2を介設して、同改良材供給部2より各改良材供給ホースh1,h2→各ホース接続体j1,j2→各改良材供給路r1,r2に改良材を供給することができるようにしている。
【0047】
また、撹拌翼体17,17は、筒状に形成した掘削刃本片10b内において、支持片10a,10aの直上方位置に配置している。
【0048】
このようにして、この場合も、筒状に形成した掘削刃本片10b内に掘削された掘削土壌には、改良材が内方と外方の両方向から吐出されると共に、掘削刃本片10bを支持する支持片10a,10aが掘削土壌と改良材とを撹拌する攪拌翼として機能し、かつ、この撹拌翼体として機能する支持片10a,10aが攪拌翼体17,17と相互に反対方向に回転して、掘削土壌中に改良材をより一層均質に分散させることができて、地盤改良効果を向上させることができる。
【0049】
【発明の効果】
(1)請求項1記載の本発明では、上下方向に伸延する掘削軸体と、同掘削軸体の下端部に設けた掘削刃体とを具備する地盤改良装置において、掘削刃体は、掘削軸体の下端部より半径方向に伸延させて形成した支持片と、同支持片の先端部に取り付けた筒状の掘削刃本片と、同掘削刃本片の下端縁部より下方へ突設した複数の掘削ビットを具備し、上記掘削刃本片に、内方である掘削軸体の方向へ向けて改良材を吐出する改良材内方吐出部を設けている。
【0050】
従って、本発明に係る地盤改良装置により地盤改良作業を行う際には、掘削軸体をその軸線廻りに回転させることにより、同掘削軸体の下端部に設けた掘削刃体を同軸的に回転させて、地盤中に掘進させることができる。
この際、筒状の掘削刃本片の下端縁部より下方へ突設した掘削ビットにより地盤を掘削すると共に、同掘削刃本片に設けた改良材内方吐出部より改良材を内方である掘削軸体の方向へ向けて吐出させることにより、掘削刃本片により掘削された掘削土壌と改良材とを少なくとも掘削面の外周縁部において混練することができるため、少なくとも柱状に形成される地盤改良土の外周縁部においては、掘削土壌中への改良材の混練性を精度良く確保することができる。
しかも、掘削刃本片を支持する支持片が掘削土壌と改良材とを撹拌する攪拌翼として機能するため、同掘削土壌中に改良材を均質に分散させることができて、地盤改良効果を良好に確保することができる。
さらには、掘削軸体の下端部に掘削刃体を取り付けているだけであるため、地盤に水を供給して、同地盤を弛緩させることにより貫入抵抗を少なくするという作業を行う必要性がなく、特に、汚染土壌を改良材により改良する際に、掘削土壌の排出量を可及的に少なくすることができて、排出土壌の処理を行う必要性を少なくすることができ、その結果、排出土壌の処理コストを大幅に削減することができる。
【0051】
従って、特に、汚染土壌においては、少なくとも柱状に形成される地盤改良土の外周部においては、汚染処理を確実に行うことができて、この汚染処理された外周縁部により柱状の地盤改良土中に汚染土壌を封じ込めることができる。
【0052】
(2)請求項2記載の本発明では、掘削軸体の近傍位置から外方へ向けて改良材を吐出する改良材外方吐出部を設けている。
【0053】
このようにして、改良材内方吐出部により、掘削刃体により掘削される掘削面の外周縁部より内方である掘削軸体の方向へ向けて改良材を吐出させると共に、改良材外方吐出部により、掘削軸体の近傍位置からも外方へ向けて改良材を吐出させることができるため、掘削面の全面にわたって均質に改良材を分散させることができて、掘削土壌中に改良材を均質に混練することができる。
【0054】
従って、特に、汚染土壌においては、柱状に形成される地盤改良土の全体にわたって汚染処理を確実に行うことができて、地盤改良効果を良好に確保することができる。
【0055】
(3)請求項3記載の本発明では、掘削軸体に、同掘削軸体の半径方向に伸延する攪拌翼体を設け、同撹拌翼体により各吐出部より吐出された改良材を撹拌するようにしている。
【0056】
このようにして、撹拌翼体により掘削土壌と改良材とを撹拌するようにしているため、同掘削土壌中に改良材を均質に分散させることができて、地盤改良効果を向上させることができる。
【図面の簡単な説明】
【図1】本発明に係る地盤改良装置の説明図。
【図2】第1実施例としての改良材吐出構造を示す一部切欠側面図。
【図3】同改良材吐出構造の一部切欠底面説明図。
【図4】第2実施例としての改良材吐出構造を示す一部切欠側面図。
【図5】同改良材吐出構造の一部切欠底面説明図。
【図6】第3実施例としての改良材吐出構造を示す一部切欠側面図。
【図7】同改良材吐出構造の一部切欠底面説明図。
【図8】第4実施例としての改良材吐出構造を示す一部切欠側面図。
【図9】同改良材吐出構造の一部切欠底面説明図。
【符号の説明】
A 地盤改良装置
1 ベースマシン
2 改良材供給部
3 ベースマシン本体
4 リーダ
5 モータ支持体
6 駆動用モータ
7 掘削軸体
8 二重反転歯車機構
10 掘削刃体
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ground improvement device.
[0002]
[Prior art]
Conventionally, as one form of the ground improvement device for improving the ground, a stirring blade body is attached to the lower peripheral surface of the excavation shaft body, a drilling blade body is attached to the lower end portion of the excavation shaft body, and the lower end portion of the excavation shaft body is Some excavating blades are provided with an improved material discharge portion at the center of the excavating blade or the lower outer peripheral surface of the excavating shaft.
[0003]
In the ground improvement device, the excavation blade body is rotated through the excavation shaft body so that the excavation blade body excavates the ground into the ground and rotates integrally with the excavation blade body. The excavated soil is agitated by the stirring blade body, and the improved material is discharged from the improved material discharge section to knead the excavated soil and the improved material.
[0004]
Here, as the improvement material, a ground material is improved by using a treatment material for treating contaminated soil or a solidification material such as cement paste.
[0005]
[Problems to be solved by the invention]
However, in the ground improvement device described above, the improvement material discharge part is provided at the center part of the excavation blade body, which is the lower end part of the excavation shaft body, or the lower outer peripheral surface of the excavation shaft body. There is a problem that the improved material is difficult to reach to the outer peripheral edge of the excavated surface excavated by the excavating blade body, even though the improved improved material is agitated by the agitating blade body.
[0006]
Therefore, ideally, the excavated soil and the improved material should be homogeneously kneaded to form a columnar ground improved soil, but in reality, the improved material is sufficiently mixed at the periphery of the ground improved soil. There is a bug that is not.
[0007]
[Means for Solving the Problems]
Therefore, in the present invention, in the ground improvement device including the excavation shaft body extending vertically and the excavation blade body provided at the lower end portion of the excavation shaft body, the excavation blade body is more than the lower end portion of the excavation shaft body. A support piece formed by extending in the radial direction, a cylindrical excavation blade main piece attached to the tip of the support piece, and a plurality of excavation bits projecting downward from the lower edge of the excavation blade main piece Provided is a ground improvement device provided with an improved material inward discharge portion that discharges the improved material toward the inner side of the excavation shaft body on the excavation blade main piece. .
[0008]
The present invention is also characterized by the following configuration.
[0009]
(1) An improved material outer discharge portion for discharging the improved material from the position near the excavation shaft body outward is provided.
[0010]
(2) The excavation shaft body is provided with a stirring blade body extending in the radial direction of the excavation shaft body, and the improved material discharged from each discharge portion is stirred by the stirring blade body.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0012]
That is, the ground improvement apparatus according to the present invention includes, as a basic structure, a drilling shaft body extending in the vertical direction and a drilling blade body provided at the lower end of the drilling shaft body.
[0013]
As a characteristic structure, an improved material inward discharge portion that discharges the improved material from the position near the outermost portion of the excavation blade body toward the inward excavation shaft body is provided.
[0014]
In addition, an improved material outward discharge portion is provided that discharges the improved material outward from a position near the excavation shaft body.
[0015]
Further, the excavation shaft body is provided with a stirring blade body extending in the radial direction of the excavation shaft body, and the improved material discharged from each discharge portion is stirred by the stirring blade body.
[0016]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0017]
[First embodiment]
A shown in FIG. 1 is a ground improvement device according to the present invention having an improved material discharge structure as a first embodiment, and the ground improvement device A includes a base machine 1 and an improved material supply unit 2. ing.
[0018]
As shown in FIG. 1, the base machine 1 is provided with a leader 4 that extends in the vertical direction on a self-propelled base machine body 3, and a motor support 5 is attached to the leader 4 so as to be movable up and down. The driving motor 6 is mounted on the upper end of the excavation shaft 7 that extends in the vertical direction on the driving motor 6, and is detachably attached to the lower end of the excavation shaft 7. The excavation blade body 10 is attached to.
[0019]
As shown in FIGS. 1 and 2, the improved material supply unit 2 includes an improved material storage tank and an improved material supply pump (not shown), and the first and second improved material supply hoses are provided in the improved material supply pump. Connect the base ends of h1 and h2 and connect the tip of each improvement material supply hose h1 and h2 to the excavation shaft body 7 via first and second hose connectors j1 and j2 such as swivel joints. Yes. Here, as the improving material, a processing material for treating contaminated soil or a solidifying material such as cement paste can be used.
[0020]
As shown in FIGS. 2 and 3, the excavation shaft body 7 is formed by connecting a cylindrical shaft body 11 formed by extending in the vertical direction to the driving motor 6 via a counter rotating gear mechanism 8. The shaft 11 can be rotated about its axis by the driving motor 6.
[0021]
A cylindrical body 12 formed by extending in the vertical direction is inserted into the shaft body 11 to form a first improvement material supply path r1 in the cylindrical body 12, and the outer periphery of the cylindrical body 12 is formed. A second improvement material supply path r2 is formed between the surface and the inner peripheral surface of the shaft body 11.
[0022]
Moreover, the first and second hose connectors j1 and j2 are provided at the upper end of the cylindrical body 12 and the upper end of the shaft 11, respectively, and the hose connectors j1 and j2 and the above-described improved material supply unit are provided. 2, the first and second improved material supply hoses h 1 and h 2 are interposed, and the improved material supply hose h 1 and h 2 → the respective hose connectors j 1 and j 2 → The improvement material can be supplied to each of the improvement material supply paths r1 and r2.
[0023]
In the structure as described above, the improved material discharge structure as the first embodiment is provided with the improved material outward discharge portion 13 and the excavating blade body 10 at the lower end portion of the shaft body 11, and the improved material outward discharge The portion 13 forms the improved material outer discharge holes 13a, 13a in the peripheral wall at the lower end portion of the shaft body 11, and communicates with the improved material outer discharge holes 13a, 13a in the peripheral wall at the lower end portion of the cylindrical body 12. Communication holes 13b and 13b are formed, and the respective improved material outer discharge holes 13a and 13a are communicated with the first improved material supply path r1 via the communication holes 13b and 13b.
[0024]
In this way, the improved material supplied through the first improved material supply path r1 is discharged in the radial direction (outward direction a) of the shaft body 11 from the improved material outer discharge holes 13a, 13a. .
[0025]
As shown in FIGS. 2 and 3, the excavating blade body 10 includes a pair of left and right support pieces 10a, 10a formed by extending in the radial direction from the lower end portion of the shaft body 11, and tip portions of both support pieces 10a, 10a. It has a cylindrical excavation blade piece 10b attached in between and a plurality of excavation bits 10c projecting downward from the lower edge of the excavation blade piece 10b, coaxially and integrally with the shaft body 11. To rotate.
[0026]
And in the pair of left and right support pieces 10a, 10a, improved material supply communication passages 14, 14 are formed along the extending direction, and the base ends of the improved material supply communication passages 14, 14 are second improved. It communicates with the material supply path r2.
[0027]
Further, in the cylindrical excavation blade main piece 10b, improvement material discharge channels 15, 15 are formed along the axial direction (vertical direction), and base ends of the improvement material discharge channels 15, 15 are formed. Are communicated with the tip portions of the improvement material supply communication passages 14, 14, while the improvement material inward discharge portion 16, the tip portion of each improvement material discharge flow path 15, 15 is formed on the inner peripheral wall of the excavation blade main piece 10b. The sixteen improved material inner discharge holes 16a and 16a communicate with each other.
[0028]
In this way, the improved material supplied through the second improved material supply path r2 is changed from the improved material supply communication channels 14, 14 to the improved material discharge channels 15, 15 to the shaft body through the improved material inner discharge holes 16a and 16a. It is made to discharge in the inward direction b which is the 11th side.
[0029]
When performing the ground improvement work by the ground improvement device A configured as described above, the excavation blade body 10 attached integrally to the lower end portion of the coaxial body 11 is rotated by rotating the shaft body 11 around its axis. Rotate coaxially and dig into the ground G.
[0030]
At this time, the ground G is excavated by the excavating bit 10c provided at the lower edge of the excavating blade body 10, and the improved material is discharged inward from the improved material inner discharge holes 16a and 16a, and the improved The improved material is discharged in the outward direction a from the material outward discharge holes 13a, 13a, and the improved material is uniformly dispersed in the excavated soil to be improved soil g.
[0031]
And, the excavation soil excavated in the excavation blade main piece 10b formed in a cylindrical shape, the improvement material is discharged from both the inner and outer directions, and the support pieces 10a for supporting the excavation blade main piece 10b, Since 10a functions as a stirring blade for stirring the excavated soil and the improved material, the improved material can be uniformly dispersed in the excavated soil, and the ground improvement effect can be secured satisfactorily.
[0032]
Further, in this embodiment, the excavation blade body 10 is only attached to the lower end portion of the excavation shaft body 7, and therefore the work of supplying water to the ground and relaxing the ground to reduce the penetration resistance. In particular, when improving contaminated soil with improvement materials, the amount of excavated soil can be reduced as much as possible, and the need to treat discharged soil can be reduced. As a result, the treatment cost of discharged soil can be greatly reduced.
[0033]
[Second Embodiment]
4 and 5 show an improved material discharge structure as a second embodiment, and the improved material discharge structure has the same basic structure as the improved material discharge structure as the first embodiment described above. However, the difference is that in the excavation blade main piece 10b formed in a cylindrical shape, straight stirring blade bodies 17 and 17 extending in the radial direction of the coaxial body 11 are provided below the shaft body 11.
[0034]
Then, the three support pieces 10a, 10a, 10a are arranged in a downwardly inclined manner at a position directly above the stirring blade bodies 17, 17, and are stirred between the stirring blade bodies 17, 17. S is formed.
[0035]
Further, the stirring blade bodies 17 and 17 are disposed above the improved material outer discharge holes 13a and 13a and the improved material inner discharge holes 16a, 16a and 16a.
[0036]
In this way, the improved material is introduced from the improved material outer discharge holes 13a, 13a and the improved material inner discharge holes 16a, 16a, 16a into the excavated soil in the excavated blade main piece 10b excavated by the excavated blade body 10. It is discharged and then stirred by the stirring blade bodies 17 and 17 so that the improved material can be uniformly dispersed in the excavated soil.
[0037]
At this time, since the stirring space S is formed between the stirring blade bodies 17, 17 and the support pieces 10a, 10a, 10a, the excavated soil and the improved material can be efficiently stirred.
[0038]
[Third embodiment]
6 and 7 show an improved material discharge structure as a third embodiment, and the improved material discharge structure has the same basic structure as the improved material discharge structure as the second embodiment described above. However, the excavation shaft body 7 has an inner / outer double shaft structure, the inner shaft 20 is provided with the improved material outer discharge portion 13 and the stirring blade bodies 17 and 17, while the outer shaft 21 is provided with the excavation blade body 10. In addition, the difference is that the improved material inward discharge portion 16 is provided in the excavation blade body 10.
[0039]
That is, as shown in FIGS. 6 and 7, the excavation shaft body 7 extends in the vertical direction so as to surround the cylindrical inner shaft 20 formed by extending in the vertical direction and the outer periphery of the inner shaft 20. The cylindrical outer shaft 21 is formed into an inner / outer double shaft structure, and the inner shaft 20 and the outer shaft 21 have the same axial center via a counter rotating gear mechanism 8 by a driving motor 6. It is designed to rotate in opposite directions.
[0040]
A first improved material supply path r1 is formed in the inner shaft 20, and a second improved material supply path r2 is formed between the outer peripheral surface of the inner shaft 20 and the inner peripheral surface of the outer shaft 21.
[0041]
In addition, the first and second hose connectors j1 and j2 are provided at the upper end of the inner shaft 20 and the upper end of the outer shaft 21, respectively. The first and second improved material supply hoses h1 and h2 are interposed between the improved material supply unit 2 and the improved material supply hoses h1 and h2 → the hose connectors j1 and j2 → each. The improved material can be supplied to the improved material supply paths r1 and r2.
[0042]
In this manner, the excavated soil excavated in the excavated blade main piece 10b formed in a cylindrical shape is discharged from both the inner and outer directions, and the support that supports the excavated blade main piece 10b. The pieces 10a and 10a function as a stirring blade that stirs the excavated soil and the improved material, and the support pieces 10a and 10a that function as the stirring blade body rotate in opposite directions to the stirring blade bodies 17 and 17, respectively. Further, the improving material can be dispersed more uniformly in the excavated soil, and the ground improvement effect can be improved.
[0043]
[Fourth embodiment]
8 and 9 show an improved material discharge structure as a fourth embodiment, and the improved material discharge structure has the same basic structure as the improved material discharge structure as the third embodiment. However, the improved material outer discharge portion 13 and the excavation blade body 10 are provided on the inner shaft 20, and the improved material inner discharge portion 16 is provided on the excavation blade body 10, while the agitating blade bodies 17 and 17 are provided on the outer shaft 21. It differs in the point provided.
[0044]
That is, as shown in FIGS. 8 and 9, the excavation shaft body 7 extends in the vertical direction so as to surround the cylindrical inner shaft 20 formed by extending in the vertical direction and the outer periphery of the inner shaft 20. The cylindrical outer shaft 21 is formed into an inner / outer double shaft structure, and the inner shaft 20 and the outer shaft 21 have the same axial center via a counter rotating gear mechanism 8 by a driving motor 6. It is designed to rotate in opposite directions.
[0045]
A cylindrical body 12 formed by extending in the vertical direction is inserted into the inner shaft 20 to form a first improvement material supply path r1 in the cylindrical body 12, and the outer periphery of the cylindrical body 12 is formed. A second improvement material supply path r2 is formed between the surface and the inner peripheral surface of the inner shaft 20.
[0046]
In addition, the first and second hose connectors j1 and j2 are provided at the upper end of the cylindrical body 12 and the upper end of the inner shaft 20, respectively. 2, the first and second improved material supply hoses h 1 and h 2 are interposed, and the improved material supply hose h 1 and h 2 → the respective hose connectors j 1 and j 2 → The improvement material can be supplied to each of the improvement material supply paths r1 and r2.
[0047]
Further, the stirring blade bodies 17 and 17 are arranged at positions directly above the support pieces 10a and 10a in the excavation blade main piece 10b formed in a cylindrical shape.
[0048]
Thus, also in this case, the excavation soil excavated in the excavation blade main piece 10b formed in the cylindrical shape is discharged from both the inner and outer directions, and the excavation blade main piece 10b. The support pieces 10a, 10a that support the agitator function as stirring blades for agitating the excavated soil and the improved material, and the support pieces 10a, 10a that function as the stirring blade bodies are in opposite directions to the stirring blade bodies 17, 17 It is possible to disperse the improvement material more uniformly in the excavated soil and to improve the ground improvement effect.
[0049]
【The invention's effect】
(1) In the first aspect of the present invention, in the ground improvement device including the excavation shaft extending in the vertical direction and the excavation blade provided at the lower end of the excavation shaft, the excavation blade is excavated. A support piece formed by extending in the radial direction from the lower end portion of the shaft body, a cylindrical excavation blade main piece attached to the tip end portion of the support piece, and projecting downward from the lower end edge of the excavation blade main piece The excavating blade main piece is provided with an improved material inner discharge portion that discharges the improved material toward the inner excavation shaft body.
[0050]
Therefore, when the ground improvement work is performed by the ground improvement device according to the present invention, the excavation blade provided at the lower end of the excavation shaft is rotated coaxially by rotating the excavation shaft around the axis. And can dig into the ground.
At this time, the excavation bit projecting downward from the lower edge of the cylindrical excavation blade main piece is excavated by the excavation bit, and the improvement material is introduced inward from the improvement material inward discharge portion provided in the excavation blade main piece. By discharging toward the direction of a certain excavation shaft body, the excavated soil and the improved material excavated by the excavation blade main piece can be kneaded at least at the outer peripheral edge portion of the excavation surface, and thus formed at least in a column shape. In the outer peripheral edge of the ground improved soil, the kneadability of the improved material into the excavated soil can be ensured with high accuracy.
In addition, since the support piece that supports the excavating blade main piece functions as a stirring blade that agitates the excavated soil and the improved material, the improved material can be uniformly dispersed in the excavated soil, and the ground improvement effect is good. Can be secured.
Furthermore, since only the excavation blade body is attached to the lower end portion of the excavation shaft body, there is no need to supply water to the ground and relax the ground to reduce the penetration resistance. In particular, when improving contaminated soil with improving materials, the amount of excavated soil can be reduced as much as possible, and the need to treat the discharged soil can be reduced. Soil treatment costs can be greatly reduced.
[0051]
Therefore, particularly in the contaminated soil, at least the outer periphery of the soil-improved soil formed in a columnar shape can be reliably subjected to the contamination treatment. Can contain contaminated soil.
[0052]
(2) In the present invention described in claim 2, an improved material outward discharge portion is provided for discharging the improved material outward from a position near the excavation shaft body.
[0053]
In this way, the improvement material inward discharge portion causes the improvement material to be discharged toward the excavation shaft body which is inward from the outer peripheral edge portion of the excavation surface excavated by the excavation blade body, and the improvement material outward direction. The discharger can discharge the improved material outward from the position near the excavated shaft body, so that the improved material can be uniformly distributed over the entire surface of the excavated surface and improved material in the excavated soil. Can be homogeneously kneaded.
[0054]
Therefore, in particular, in contaminated soil, it is possible to reliably perform the contamination treatment over the entire ground-improved soil formed in a columnar shape, and to ensure a favorable ground-improving effect.
[0055]
(3) In the present invention described in claim 3, the excavation shaft body is provided with a stirring blade body extending in the radial direction of the excavation shaft body, and the improvement material discharged from each discharge portion is stirred by the stirring blade body. I am doing so.
[0056]
In this way, since the excavated soil and the improved material are agitated by the stirring blade body, the improved material can be uniformly dispersed in the excavated soil, and the ground improvement effect can be improved. .
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a ground improvement device according to the present invention.
FIG. 2 is a partially cutaway side view showing an improved material discharge structure as a first embodiment.
FIG. 3 is a partially cutaway bottom view of the improved material discharge structure.
FIG. 4 is a partially cutaway side view showing an improved material discharge structure as a second embodiment.
FIG. 5 is a partially cutaway bottom view of the improved material discharge structure.
FIG. 6 is a partially cutaway side view showing an improved material discharge structure as a third embodiment.
FIG. 7 is a partially cutaway bottom view of the improved material discharge structure.
FIG. 8 is a partially cutaway side view showing an improved material discharge structure as a fourth embodiment.
FIG. 9 is a partially cutaway bottom view of the improved material discharge structure.
[Explanation of symbols]
A Ground improvement device 1 Base machine 2 Improvement material supply unit 3 Base machine body 4 Reader 5 Motor support 6 Driving motor 7 Excavation shaft 8 Counter rotating gear mechanism
10 Drilling blade

Claims (3)

上下方向に伸延する掘削軸体と、同掘削軸体の下端部に設けた掘削刃体とを具備する地盤改良装置において、
掘削刃体は、掘削軸体の下端部より半径方向に伸延させて形成した支持片と、同支持片の先端部に取り付けた筒状の掘削刃本片と、同掘削刃本片の下端縁部より下方へ突設した複数の掘削ビットを具備し、
上記掘削刃本片に、内方である掘削軸体の方向へ向けて改良材を吐出する改良材内方吐出部を設けたことを特徴とする地盤改良装置。
In the ground improvement device comprising a drilling shaft extending in the vertical direction and a drilling blade provided at the lower end of the drilling shaft,
The excavation blade body includes a support piece formed by extending in a radial direction from a lower end portion of the excavation shaft body, a cylindrical excavation blade main piece attached to a tip portion of the support piece, and a lower end edge of the excavation blade main piece. A plurality of excavation bits projecting downward from the section,
A ground improvement device characterized in that an improved material inward discharge portion for discharging the improved material toward an inward direction of the excavation shaft body is provided in the excavation blade main piece .
掘削軸体の近傍位置から外方へ向けて改良材を吐出する改良材外方吐出部を設けたことを特徴とする請求項1記載の地盤改良装置。  The ground improvement device according to claim 1, further comprising an improved material outward discharge portion that discharges the improved material outward from a position near the excavation shaft body. 掘削軸体に、同掘削軸体の半径方向に伸延する攪拌翼体を設け、同撹拌翼体により各吐出部より吐出された改良材を撹拌するようにしたことを特徴とする請求項1又は2記載の地盤改良装置。  The excavation shaft body is provided with a stirring blade body extending in a radial direction of the excavation shaft body, and the improvement material discharged from each discharge portion is stirred by the stirring blade body. 2. Ground improvement apparatus according to 2.
JP2002179114A 2002-06-19 2002-06-19 Ground improvement device Expired - Lifetime JP3657926B2 (en)

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