JP2009243191A - Soil improving device and soil improving method - Google Patents
Soil improving device and soil improving method Download PDFInfo
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- JP2009243191A JP2009243191A JP2008092279A JP2008092279A JP2009243191A JP 2009243191 A JP2009243191 A JP 2009243191A JP 2008092279 A JP2008092279 A JP 2008092279A JP 2008092279 A JP2008092279 A JP 2008092279A JP 2009243191 A JP2009243191 A JP 2009243191A
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- 239000002689 soil Substances 0.000 title claims abstract description 155
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 44
- 239000007924 injection Substances 0.000 claims abstract description 44
- 230000002093 peripheral effect Effects 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000007711 solidification Methods 0.000 claims abstract 6
- 230000008023 solidification Effects 0.000 claims abstract 6
- 238000003756 stirring Methods 0.000 claims description 49
- 238000010276 construction Methods 0.000 claims description 11
- 239000011800 void material Substances 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 9
- 238000010907 mechanical stirring Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims 2
- 238000006073 displacement reaction Methods 0.000 abstract description 12
- 238000013019 agitation Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 26
- 230000000694 effects Effects 0.000 description 14
- 239000004927 clay Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
本発明は、単管式の高圧噴射攪拌地盤改良装置の攪拌ロッドの攪拌翼の上方に近接して螺旋状土壌押上板を設け、該螺旋状土壌押上板によって地盤変位低減のために排土を行う高圧噴射攪拌地盤改良装置及び工法に関する。 In the present invention, a spiral soil lifting plate is provided in the vicinity of a stirring blade of a stirring rod of a single-pipe high pressure jet stirring ground improvement device, and the spiral soil lifting plate is used to discharge soil for ground displacement reduction. The present invention relates to a high-pressure jet agitating ground improvement device and method.
単管式の高圧噴射攪拌地盤改良装置を用いての地盤改良工法は、一般的に他の二重管、三重管の高圧噴射攪拌工法に比べて、施工中に排泥を出さない分経済的であるが、周辺地盤の変位等が発生し易い。 The ground improvement method using the single pipe type high pressure jet agitating ground improvement device is generally more economical than other double pipe and triple pipe high pressure jet agitating methods because it does not generate any mud during construction. However, displacement of the surrounding ground is likely to occur.
この単管式高圧噴射攪拌工法の経済性と、周辺地盤への変位の低減を両立している工法として、攪拌ロッド先端部に設けた攪拌翼とその真上に設けた土壌押上板により、該土壌押上板の投影面積分の板上に載った原土を排土し、該土壌押上板の下方に空隙を形成し、固化材スラリーと混合された混合土を該空隙に吸収することによって、周辺地盤への変位等を低減させる工法が実用化されている。当該工法は、排土された土は固化材が混入しない原土であるので、排泥としての処理が必要なく、その排出量も二重管、三重管工法の排泥に比べて少ない工法として知られている。(特許文献1)
また、上記発明を進歩させた技術として、土壌押上円板の半径が注入ロッドの軸身に設けられた攪拌翼の半径と同一寸法、又は前記攪拌翼半径より10cm以下望ましくは5cm小さく、且つ、投影平面形状が円周分に加えて中心角が10度程度の扇型状に重複させるか、又は略円周1周分で、螺旋形状土壌押上円板の傾きが10〜20度に形成した土壌押上円板を備えた攪拌装置で、軟弱地盤を削孔する際に、削孔を複数回の再削孔・再引上げで又削孔水を低圧で噴射しながら行うことにより、攪拌翼により形成される攪乱部直径内部と該土壌押上円板の直径内に含まれる軟弱地盤と直径外の領域が、円筒状の泥水膜によって縁切りされ、その際、該土壌押上円板の直径内に含まれる軟弱土が上方に押上げられる時の土のせん断抵抗が少なく、確実な排土が可能になる工法が実用化されている。(特許文献2)
しかし、前記の排土を伴う単管式高圧噴射攪拌工法では、特に高含水比で軟弱な粘土、鋭敏性の高い粘性土、及び自立しないゆるい砂質土等が改良対象土の場合、前記円筒状の泥水膜が形成されにくく、一旦形成されても容易に泥水膜が塞がることがあり、確実な排土ができない状態となることがあった。
この様な場合には、周辺地盤への変位等の影響が大きくなり、施工上不都合が生じる場合がある。
However, in the single-pipe high-pressure jet stirring method with the above-mentioned soil removal, when the clay to be improved is soft soil having a high water content ratio, highly sensitive clay soil, loose sandy soil that does not stand alone, etc., the cylinder It is difficult to form a muddy water film, and even once formed, the muddy water film may be easily clogged, resulting in a situation where reliable soil removal cannot be performed.
In such a case, the influence of displacement or the like on the surrounding ground becomes large, which may cause inconvenience in construction.
また、土壌押上板の表面が滑らかであるために、排土のためにロッド引上げの時に、土壌押上板に載せられて上昇してくる排土が滑って側方に逸散し、確実な排土ができない状態となることがあった。
この様な場合にも、周辺地盤への変位地盤への変位等の影響が大きくなり施工上不都合が生じる場合がある。
In addition, since the surface of the soil lifting plate is smooth, when the rod is pulled up to remove the soil, the rising soil placed on the soil lifting plate slides and scatters to the side, ensuring reliable discharge. In some cases, soil could not be produced.
Even in such a case, the influence of the displacement to the displacement ground to the surrounding ground becomes large, which may cause inconvenience in construction.
そこで、本発明は前記の状態のために確実な排土ができなくなることを防止する地盤改良装置と地盤改良工法の提供を課題とする。 Then, this invention makes it a subject to provide the ground improvement apparatus and ground improvement construction method which prevent that reliable earth removal cannot be performed because of the said state.
この出願に係る発明は、単管式注入ロッド先端の掘削刃、及び該掘削刃の上方に水平方向に延設された攪拌翼によって地盤を予定深度まで掘削し、前記注入ロッドを通じて地盤中に高圧噴射される固化材スラリーのエネルギーで、攪拌翼の外側の地盤を切削・混合しつつ、注入ロッドの固化材スラリー噴射口の上方に近接して設けた螺旋状土壌押上板により、固化材スラリー噴射口の近傍の撹乱土を上方へ押し上げて、前記螺旋状土壌押上板の下方に空隙を形成し、固化材スラリーと混合された混合土を、該空隙に吸収し、改良予定地盤中に円柱状の改良体を造成する工法に用いる地盤改良装置の、前記螺旋状土壌押上板の周縁部に板状突起片を設けたことを特徴とする。 In the invention according to this application, the ground is excavated to a predetermined depth by a drilling blade at the tip of a single tube injection rod and a stirring blade extending in the horizontal direction above the drilling blade, and high pressure is injected into the ground through the injection rod. While the ground outside the stirring blade is being cut and mixed with the energy of the solidifying material slurry to be injected, the solidified material slurry is injected by a spiral soil push-up plate provided close to the solidifying material slurry injection port of the injection rod. By pushing up the disturbed soil near the mouth upward, a void is formed below the spiral soil lifting plate, and the mixed soil mixed with the solidifying slurry is absorbed into the void, and is cylindrical in the planned improvement ground. The ground improvement apparatus used for the construction method which produces the improvement body of this invention provided the plate-shaped protrusion piece in the peripheral part of the said spiral soil raising board.
また、螺旋状土壌押上板の周縁部に設けた板状突起片の先端までの螺旋状土壌押上板の半径が、攪拌翼の半径を上回らない半径であって、板状突起片が螺旋状土壌押上板の周縁部から0度(水平)〜60度の範囲で上向きに突起し、かつ、螺旋状土壌押上板の周縁部に2箇所以上設けられていることを特徴とする。 Further, the radius of the spiral soil lifting plate up to the tip of the plate-like projection piece provided at the peripheral edge of the spiral soil lifting plate is a radius that does not exceed the radius of the stirring blade, and the plate-like projection piece is the spiral soil. It protrudes upward in the range of 0 degrees (horizontal) to 60 degrees from the peripheral edge of the lifting plate, and is provided at two or more positions on the peripheral edge of the spiral soil lifting plate.
さらに、前記螺旋状土壌押上板の周縁部に設けた板状突起片が、鋸歯状突起片に形成され、また、周縁部に設けられた鋸歯状突起片の先端までの螺旋状土壌押上板の半径が、攪拌翼の半径を上回らない半径であって、鋸歯状突起片が螺旋状土壌押上板の周縁部から0度(水平)〜60度の範囲で上向きに突起していることを特徴とする。 Further, a plate-like projection piece provided on the peripheral edge portion of the spiral soil push-up plate is formed on the saw-tooth projection piece, and the spiral soil push-up plate up to the tip of the saw-tooth projection piece provided on the peripheral portion is provided. The radius is a radius that does not exceed the radius of the agitating blade, and the sawtooth-shaped protruding piece protrudes upward in the range of 0 degrees (horizontal) to 60 degrees from the peripheral edge of the spiral soil lifting plate. To do.
また、螺旋状土壌押上板の表面に小突起片を複数個設けたことを特徴とする。 In addition, a plurality of small protrusions are provided on the surface of the spiral soil lifting plate.
また、単管式の高圧噴射攪拌地盤改良装置の注入ロッド先端の掘削刃、及び該掘削刃の上方に水平方向に延設された攪拌翼によって地盤を予定深度まで掘削し、前記注入ロッドを通じて地盤中に、前記攪拌翼の固化材噴射口より高圧噴射される固化材スラリーのエネルギーで、攪拌翼の外側の地盤を切削・混合しつつ、注入ロッドの固化材スラリー噴射口の上方に近接して設けた螺旋状土壌押上板により、固化材スラリー噴射口の近傍の撹乱土を上方へ押し上げて、前記螺旋状土壌押上板の下方に空隙を形成し、固化材スラリーと混合された混合土を、該空隙に吸収し、改良予定地盤中に円柱状の改良体を造成する工法において、注入ロッドの攪拌翼の上方に近接して、周縁部に板状突起片、鋸歯状、又は棒状等の突起を付設した螺旋状土壌押上板、及び/又は表面に突起を設けた該土壌押上板を設け、該突起片を有する螺旋状土壌押上板により固化材スラリー噴射口の近傍の撹乱土を上方へ押し上げて、螺旋状土壌押上板の下方に空隙を形成し、固化材スラリーと混合された混合土を、該空隙に吸収し改良予定地盤中に円柱状の改良体を造成することを特徴とする。 Further, the ground is excavated to a predetermined depth by the excavating blade at the tip of the injection rod of the single-tube high-pressure jet agitating ground improvement device and the stirring blade extending horizontally above the excavating blade, and the ground is passed through the injection rod. While the ground outside the stirring blade is being cut and mixed with the energy of the solidifying material slurry injected at a high pressure from the solidifying material injection port of the agitating blade, it is close to the upper portion of the solidifying material slurry injection port of the injection rod. By the provided spiral soil lifting plate, the disturbed soil in the vicinity of the solidifying material slurry injection port is pushed up, a void is formed below the helical soil lifting plate, and the mixed soil mixed with the solidifying material slurry is mixed. In the method of absorbing the gap and creating a cylindrical improvement body in the ground to be improved, it is close to the upper part of the stirring rod of the injection rod, and a protrusion such as a plate-like protrusion, a sawtooth, or a rod in the periphery. Spiral soil with attached The upper plate and / or the soil push plate provided with protrusions on the surface is provided, and the spiral soil push plate is pushed up by the spiral soil push plate having the protruding pieces to push up the disturbed soil in the vicinity of the solidifying material slurry injection port. A void is formed below the plate, and the mixed soil mixed with the solidifying material slurry is absorbed into the void to form a cylindrical improvement body in the ground to be improved.
螺旋状土壌押上板の周囲に設けられた板状突起片、又は鋸歯状突起片でロッド回転時に、攪拌翼の先端が通過する攪拌部分と螺旋状土壌押上板の通過する間に形成される泥水膜部分を再攪拌し、確実に泥水膜を形成する。
そして、この泥水膜により螺旋状土壌押上板に載せられて上昇する円柱状土壌が縁切りされ、確実に排土がなされる。
さらに、前記板状突起片又は鋸歯状突起片が、螺旋状土壌板の周縁部に上向き設けられていることによって、円柱状土塊が土壌押上板上を滑るのを防止できる。
Muddy water formed between the agitating portion where the tip of the agitating blade passes and the spiral soil raising plate passing when the rod rotates with the plate-like projection piece or sawtooth-like projection piece provided around the spiral soil raising plate Re-stir the membrane part to ensure the formation of a muddy water film.
Then, the muddy water film cuts the columnar soil that is placed on the spiral soil lifting plate and rises, and the soil is reliably discharged.
Furthermore, the plate-like projection piece or the sawtooth-like projection piece is provided upward on the peripheral edge of the spiral soil board, so that the columnar soil block can be prevented from sliding on the soil pushing board.
土壌押上板の周縁部に設けた鋸歯状突起片が、螺旋状土壌押上板の周縁部から0度(水平)〜60度の範囲で上向きに突起しているので、螺旋状土壌押上板に載せられて上昇する円柱状土塊と前記螺旋状土壌押上板表面との摩擦を大きくし、前記螺旋状土壌押上板から円柱状の土塊が滑り散逸するのを防ぐ。 Since the serrated protrusions provided on the periphery of the soil lifting board protrude upward from the periphery of the spiral soil lifting board in the range of 0 degrees (horizontal) to 60 degrees, it is placed on the spiral soil lifting board. Thus, the friction between the rising columnar soil block and the surface of the spiral soil lifting plate is increased, and the cylindrical soil block is prevented from slipping away from the spiral soil lifting plate.
この発明の地盤改良施工装置は、そのロッド先端部の攪拌翼及び板状突起片を備えた螺旋状土壌押上板から成るモニターに構成したもので、地盤改良を必要とする改良対象土が、高含水比、又は鋭敏性の高い粘性土や、ゆるい砂質土等の地盤改良対象土である場合にも、地盤改良時に確実な排土ができ、周辺地盤に変位等の悪影響を与えることを防ぐことができる。 The ground improvement construction device according to the present invention is a monitor composed of a spiral soil lifting plate provided with a stirring blade and a plate-like protruding piece at the tip of the rod. Even if it is soil subject to ground improvement such as highly moisture-sensitive or highly sensitive clay soil, loose sandy soil, etc., it can be surely drained during ground improvement and prevent adverse effects such as displacement on the surrounding ground. be able to.
この発明の最良の実施の形態を図に基づいて説明する。
図1に示すように、1は単管式高圧噴射地盤改良装置であり、該地盤改良装置の回転上下動機構2で注入ロッド3を上下動可能に支柱4で支持する。
注入ロッド3は先端部に掘削刃5、その上部に噴射ノズル6を有する攪拌翼7を設け、該攪拌翼7の上部に近接して周縁部に板状突起片9を付設した螺旋状土壌押上板8を設けてある。
螺旋状土壌押上板の周縁部に設ける板状突起片の突起は、0度(水平)から図3に示すとおり60度上向きの傾斜角とし、また、攪拌翼7の長さD1を、上記板状突起片9を設けた螺旋状土壌押上板8の投影円の径D2よりも10cm長く設定する。
なお、図中13は改良部、14排土、15はスイベル、16は圧送ホースである。
The best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIG. 1,
The
The protrusions of the plate-like protrusion pieces provided on the peripheral edge of the spiral soil lifting plate have an inclination angle of 0 degrees (horizontal) and 60 degrees upward as shown in FIG. 3, and the length D1 of the
In the figure, reference numeral 13 denotes an improved portion, 14 earth removal, 15 a swivel, and 16 a pressure feeding hose.
上記の様に構成した注入ロッド3の地中貫入時には、攪拌翼7の一方の先端の噴射ノズル6から削孔水を低圧で噴射して貫入し、攪拌翼7で攪乱された領域を、攪拌翼7の真上に設けられた螺旋状土壌押上板8がスパイラル状に土壌を切りながら貫入する。
その際に、攪拌翼7の回転による攪拌部分10と原地盤11との間に低圧で噴射された削孔水と乱された土壌とで円筒状の泥水膜12が形成され、その周囲の原地盤土壌11と縁切り効果を奏する。
When the
At that time, a cylindrical muddy water film 12 is formed between the bored water and the disturbed soil, which are jetted at a low pressure, between the stirring
前記泥水膜12は、改良対象土が高含水比、又は鋭敏性の高い粘性土や、ゆるい砂質土等である場合、自立性を失いやすく閉塞する場合がある。この様な状態になると周囲の原地盤土壌11と縁切り効果が失われるので、螺旋状土壌押上板8の周縁部に設けた板状突起片9により泥水膜部分を再攪拌し、再度確実な泥水膜12を形成させることができる。
When the soil to be improved is a high moisture content or highly viscous clay or loose sandy soil, the muddy water film 12 may easily lose its independence and may be blocked. In such a state, the edge cutting effect with the surrounding original ground soil 11 is lost, so the muddy water film portion is re-stirred by the plate-
前記螺旋状土壌押上板8の周端縁に設ける板状突起片9の大きさと設ける間隔は、対象土質に応じて適宜選定される。
一般的には砂質土が対象の場合は、螺旋状土壌押上板8に設ける板状突起片9を小さめに、また設置間隔を狭くし、粘性土を対象とする場合は、板状突起片9を大きめに、また設置間隔を広くする等の選択が好ましい。
The magnitude | size and space | interval of the plate-
In general, when sandy soil is the target, the plate-
また、螺旋状土壌押上板8の大きさは、例えば、攪拌翼7の長さD1が60cm、螺旋状土壌押上板8の直径が50cmから成る注入ロッドの場合、螺旋状土壌押の周縁部に設ける板状突起片9の長さは、3cm〜10cmの方形状の突起片が好ましい。
なお、板状突起片9の長さが3cm未満では、泥水膜12の再攪拌効果が期待できず、10cmを超えると攪拌翼7で乱された攪拌部分10の領域を超えて板状突起片9が土を乱すので、泥水膜12がかえって乱される結果となる。
また、螺旋状土壌押上板8の周縁に設ける板状突起片9の設置間隔は、前記の大きさの螺旋状土壌押上板の場合、5cm〜30cmの範囲で最低2つ以上が好ましく、設置間隔が5cm未満では、土と板状突起片9がかみ合わず突起としての効果が薄れ、30cmを超えると泥水膜12の再攪拌効果が期待できない。
なお、実施例1では、上記螺旋状土壌押上板8の周縁に縦5cm、横3cm、厚さ1.2cmの鉄板製の板状突起片9が、周端縁部より45度上向きに傾斜し、また、所定の間隔をおいて複数個取り付けられている。
Further, the size of the spiral soil push-up
If the length of the plate-
Moreover, the installation interval of the plate-
In Example 1, a plate-
図4は、この発明の地盤改良装置1の注入ロッド3先端部の螺旋状土壌押上板に付設する板状突起片の他の例を示し、螺旋状土壌押上板8の周縁部を山形の鋸歯状突起片9aに形成する。
この様に形成した地盤改良装置は、実施例1に記載の作用効果と同様である。
すなわち、注入ロッド3の地中貫入時には、攪拌翼7の一方の先端の噴射ノズル4から削孔水を低圧で噴射して貫入し、攪拌翼7で攪乱された領域を、攪拌翼7の真上に設けられた螺旋状土壌押上板8がスパイラル状に土壌を切りながら貫入する。
その際に、攪拌翼7の回転による攪拌部分10と原地盤11との間に低圧で噴射された削孔水と乱された土壌とで円筒状の泥水膜12が形成され、その周囲の原地盤土壌11と縁切り効果を奏す。
FIG. 4 shows another example of a plate-like projection piece attached to the spiral soil lifting plate at the tip of the
The ground improvement device formed in this way has the same effects as those described in the first embodiment.
That is, when the
At that time, a cylindrical muddy water film 12 is formed between the bored water and the disturbed soil, which are jetted at a low pressure, between the stirring
前記泥水膜12は、改良対象土が高含水比、又は鋭敏性の高い粘性土や、ゆるい砂質土等である場合、自立性を失いやすく閉塞する場合がある。この様な状態になると周囲の原地盤土壌11と縁切り効果が失われるので、螺旋状土壌押上板8の周縁部に設けた鋸歯状突起片9aにより泥水膜部分を再攪拌し、再度確実な泥水膜12を形成させることができる。
When the soil to be improved is a high moisture content or highly viscous clay or loose sandy soil, the muddy water film 12 may easily lose its independence and may be blocked. In such a state, the edge cutting effect with the surrounding original ground soil 11 is lost, so the muddy water film portion is re-stirred by the serrated projection pieces 9a provided at the peripheral edge of the spiral soil push-up
山形の鋸歯状突起片9aの三角形状の刃の底辺(螺旋状土壌押上板8の周端縁の接触面)の長さが3cm〜10cmで、高さ3cm〜10cmの範囲が好ましい。
山形の鋸歯状突起片9aの高さが3cm未満では、泥水膜12の再攪拌効果が期待できず、10cmを超えると攪拌翼7で乱された攪拌領域10を超えて鋸歯状突起片9aが乱すので泥水膜12をかえって乱す結果となる。
The length of the base of the triangular blade of the chevron-shaped serrated projection piece 9a (the contact surface of the peripheral edge of the spiral soil lifting plate 8) is 3 cm to 10 cm, and the height is preferably in the range of 3 cm to 10 cm.
If the height of the chevron-shaped serrated projection piece 9a is less than 3 cm, the re-stirring effect of the muddy water film 12 cannot be expected, and if it exceeds 10 cm, the serrated projection piece 9a exceeds the stirring
また、実施例1に示す板状突起片9及び第2実施例に示す鋸歯状突起片9aの螺旋状土壌押上板8に対する取り付け角度は、0度から60度が好ましく、取付け角度が0度の場合は、改良対象土が螺旋状土壌押上板8の盤面を滑りにくい土壌の場合、又は図5で説明する実施例の螺旋状土壌押上板8の上面(表面)8aに付設した角柱あるいは台形状の小突起9bのみで滑りを押さえることが出来る場合に用いられる。
鋸歯状突起片9aの角度が60度を超えると、泥水膜部分を再攪拌する領域が小さくなり、再攪拌の効果が薄れてくる。
In addition, the attachment angle of the plate-
When the angle of the serrated projection piece 9a exceeds 60 degrees, the area where the muddy water film portion is re-stirred becomes small, and the effect of re-stirring is diminished.
図5は他の実施例の形態図である。
螺旋状土壌押上板8の上面8aの適宜箇所に、四角柱あるいは図に示す台形状の小突起片9bを配設する。
この小突起片9bは螺旋状土壌押上板8の上面(表面)8aのほぼ10cm×10cmの範囲に一個の割合で設けられており、この範囲に配置される小突起片10の大きさは、角柱の場合は縦×横×高さが3cm×3cm×4cmである。
また、該小突起は直径φ1cm〜3cm、長さ2〜5cm程度の棒状でもよい。
これらの小突起を前記螺旋状土壌押上板に設ける頻度は、突起の大きさにもよるが、突起配置面積の割合で2cm×2cm=4cm2/個〜20cm×20cm=400cm2/個の範囲が好ましく、これ以上の頻度では土と突起がかみ合わず突起としての効果が薄れ、これ以下であると摩擦効果が期待できない。
FIG. 5 is a diagram of another embodiment.
A square column or a trapezoidal small protrusion piece 9b shown in the figure is disposed at an appropriate location on the
This small protrusion piece 9b is provided in a ratio of approximately 10 cm × 10 cm on the upper surface (surface) 8a of the spiral
The small protrusions may have a rod shape with a diameter of 1 cm to 3 cm and a length of about 2 to 5 cm.
The frequency of providing these small protrusions on the spiral soil lifting board depends on the size of the protrusions, but the ratio of the protrusion arrangement area ranges from 2 cm × 2 cm = 4 cm 2 / piece to 20 cm × 20 cm = 400 cm 2 / piece. Preferably, the soil and the protrusion do not mesh with each other at a frequency higher than this, and the effect as the protrusion is reduced, and if it is less than this, the friction effect cannot be expected.
また、他の実施例として図示はしていないが、機械式攪拌処理装置に設けた螺旋式土壌押上板の周縁部に、前記各実施例と同様の板状突起片又は鋸歯状突起を設け、必要に応じて螺旋状土壌押上板の表面に角柱あるいは台形状の小突起片を配設しても良い。 In addition, although not shown as another example, on the peripheral edge of the spiral soil lifting plate provided in the mechanical stirring treatment device, a plate-like protrusion piece or sawtooth-like protrusion similar to each of the above examples is provided, If necessary, a prismatic or trapezoidal small protrusion piece may be provided on the surface of the spiral soil lifting plate.
以上記載した螺旋状土壌押上板は、単管式高圧噴射攪拌装置のみならず、周辺地盤への変位低減を目的とした機械式攪拌処理装置にもそのまま適用できる。装備方法としては、攪拌ロッド先端部の攪拌翼の真上付近に設けるとよい。
攪拌翼が複数段あるときは、最上段の攪拌翼の真上付近に装着するのが適している。
The helical soil lifting plate described above can be applied as it is not only to a single-pipe high-pressure jet stirring device but also to a mechanical stirring device for the purpose of reducing displacement to the surrounding ground. As an installation method, it is preferable to provide it near the stirring blade at the tip of the stirring rod.
When there are a plurality of stirrer blades, it is suitable to be mounted near the uppermost stirrer blade.
本発明は地盤改良工における単管式高圧噴射攪拌工法の変位抑制に多大な効果を奏し、変位抑制と経済性を兼ね備えた当該工法の適応性を大きくするものであり、土木・建築工事に対する利用性が大なるものである。 The present invention has a great effect on the displacement suppression of the single-pipe high-pressure jet agitation method in the ground improvement work, and increases the adaptability of the construction method having both displacement suppression and economy, and is used for civil engineering and construction work. Sex is great.
1 地盤改良装置
2 回転上下動機構
3 注入ロッド
4 支柱
5 掘削刃
6 噴射ノズル
7 攪拌翼
8 螺旋状土壌押上板
8a 上面
8b 周縁部
9 板状突起片
9a 鋸歯状突起片
9b 角柱状小突起片
10 攪拌部分
11 原地盤
12 泥水膜
DESCRIPTION OF
8a Top surface
8b peripheral edge
DESCRIPTION OF
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JP2011132718A (en) * | 2009-12-24 | 2011-07-07 | Onoda Chemico Co Ltd | Soil improving device and soil improvement method by use of the same |
JP2020183630A (en) * | 2019-05-01 | 2020-11-12 | 株式会社中島機械 | Rotary pile |
CN115069762A (en) * | 2022-08-01 | 2022-09-20 | 宁夏农产品质量标准与检测技术研究所(宁夏农产品质量监测中心) | Device and method for degrading chlorate in planting soil |
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CN105696597B (en) * | 2016-01-25 | 2017-12-08 | 中国建筑一局(集团)有限公司 | The spiral clear earth boring auger and its construction method for removing pile tube stake holes soil |
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JP2005120819A (en) * | 2003-09-24 | 2005-05-12 | Onoda Chemico Co Ltd | Construction method for soil improvement and its device |
JP2006045994A (en) * | 2004-08-06 | 2006-02-16 | Nishimatsu Constr Co Ltd | Excavating member, excavating method, and soil improving method using the excavating member |
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JP2005120819A (en) * | 2003-09-24 | 2005-05-12 | Onoda Chemico Co Ltd | Construction method for soil improvement and its device |
JP2006045994A (en) * | 2004-08-06 | 2006-02-16 | Nishimatsu Constr Co Ltd | Excavating member, excavating method, and soil improving method using the excavating member |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2011132718A (en) * | 2009-12-24 | 2011-07-07 | Onoda Chemico Co Ltd | Soil improving device and soil improvement method by use of the same |
JP2020183630A (en) * | 2019-05-01 | 2020-11-12 | 株式会社中島機械 | Rotary pile |
CN115069762A (en) * | 2022-08-01 | 2022-09-20 | 宁夏农产品质量标准与检测技术研究所(宁夏农产品质量监测中心) | Device and method for degrading chlorate in planting soil |
CN115069762B (en) * | 2022-08-01 | 2023-05-16 | 宁夏农产品质量标准与检测技术研究所(宁夏农产品质量监测中心) | Chlorate degradation device and degradation method in planting soil |
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