JP2000290993A - Method and device for soil mixing process - Google Patents
Method and device for soil mixing processInfo
- Publication number
- JP2000290993A JP2000290993A JP11100202A JP10020299A JP2000290993A JP 2000290993 A JP2000290993 A JP 2000290993A JP 11100202 A JP11100202 A JP 11100202A JP 10020299 A JP10020299 A JP 10020299A JP 2000290993 A JP2000290993 A JP 2000290993A
- Authority
- JP
- Japan
- Prior art keywords
- mixing
- supply
- fluid
- ground
- rotating shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、地盤改良工法のうち、
特に固化系流動物を軟弱地盤中に吐出し、原位置土と混
合する地盤の混合処理工法及び装置に関するものであ
る。BACKGROUND OF THE INVENTION The present invention relates to a ground improvement method,
In particular, the present invention relates to a ground mixing method and apparatus for discharging a solidified fluid into soft ground and mixing with in situ soil.
【０００２】[0002]
【従来の技術】地盤の混合処理工法は、生石灰やセメン
トミルク等の固化系流動物を地盤中の原位置土と混合
し、固化系系流動物と粘性土等の原位置土と化学的な結
合作用を利用して、強固な柱状パイルを造成したり、土
質性状を安定化することにより地盤強度を向上するもの
である。使用装置は、通常、駆動装置により回転される
回転軸及び当該軸下側に設けられた攪拌翼と、回転軸に
沿って設けられた供給管路と、前記供給管路の上流側に
固化系流動物を導入する供給装置等を備えたものであ
る。固化系流動物は、製造プラント又はアジャスター溜
め部からポンプにより回転軸側の供給管路に圧送され、
攪拌翼の付け根部等に設けられた吐出口から攪拌翼の回
転によって形成される空隙部に吐出される。吐出された
流動物は、攪拌翼の回転に伴って回転軌跡に散布され、
原位置土と攪拌混合される。2. Description of the Related Art A ground mixing method involves mixing a solidified fluid such as quicklime or cement milk with an in situ soil in the ground, and chemically mixing the solidified fluid with an in situ soil such as a viscous soil. The strength of the ground is improved by forming a strong columnar pile and stabilizing the soil properties by utilizing the bonding action. The device used is usually a rotating shaft rotated by a driving device and a stirring blade provided below the shaft, a supply line provided along the rotation axis, and a solidification system upstream of the supply line. It is provided with a supply device and the like for introducing a fluid. The solidified fluid is pumped from the manufacturing plant or the adjuster reservoir to the supply pipe on the rotating shaft side by a pump,
The liquid is discharged from a discharge port provided at the base of the stirring blade or the like into a gap formed by rotation of the stirring blade. The discharged fluid is scattered on the rotation trajectory with the rotation of the stirring blade,
Stir and mix with in situ soil.
【０００３】この種の処理工法では、固化系流動物と原
位置土との混合度合いが地盤改良品質をほぼ決める。こ
のため、品質を確保するには、固化系流動物が原位置土
に均一に混ざるように原位置土をより良好に解したり細
分化して流動性を上げることが必須となる。そのような
観点から、従来は、回転軸の回転速度や攪拌時間の設定
等の処理制御面から対処し、同時に、攪拌翼の近傍部に
設けられる各種の共廻り防止手段により攪拌翼の移動に
伴う土の共廻りを阻止したり、攪拌翼や攪拌翼同士の間
に付着した土を除去するという混合機構面からも対処し
ている。In this type of processing method, the degree of mixing between the solidified fluid and the in-situ soil substantially determines the ground improvement quality. For this reason, in order to ensure the quality, it is essential to improve the fluidity by better breaking or subdividing the in-situ soil so that the solidified fluid is uniformly mixed with the in-situ soil. From such a viewpoint, conventionally, from the viewpoint of processing control such as setting of the rotation speed of the rotating shaft and the stirring time, at the same time, the movement of the stirring blade is controlled by various co-rotation prevention means provided near the stirring blade. The mixing mechanism is also taken to prevent the accompanying rotation of the soil and to remove the soil attached between the stirring blades and the stirring blades.
【０００４】[0004]
【発明が解決しようとする課題】上記した従来技術にあ
っては、原位置土の流動性を上げて均一混合をそれなり
に可能にするものの、例えば、原位置土が粘性土やビー
ト層等の粘着力の大きい土質、土塊になり易い硬質粘土
質の場合、吐出される固化系流動物の偏りや共廻り等に
起因して今だ充分満足できるものではなかった。In the above-mentioned prior art, although the in-situ soil is increased in flowability to enable uniform mixing to a certain extent, for example, the in-situ soil is made of a cohesive soil or a beet layer. In the case of soil with high adhesive strength or hard clay which is liable to become a clay, it is still not sufficiently satisfactory due to unevenness and co-rotation of the discharged solidified fluid.
【０００５】本出願人はこのような背景から種々検討し
てきた結果、従来における固化系流動物の吐出し形態を
工夫することにより、原位置土の流動性を上げて均一混
合をより向上できることを知見し、本発明に至った。本
発明の目的は、均一混合をより向上することと、これに
よる固化系流動物の使用量を多少なりとも減少可能にす
ることにある。他の目的は以下の説明と共に明らかにす
る。As a result of various studies from the above background, the present applicant has found that, by devising a conventional discharge form of a solidified fluid, the fluidity of the in-situ soil can be increased and uniform mixing can be further improved. Having found this, the present invention has been achieved. It is an object of the present invention to further improve the homogenous mixing and to make it possible to reduce the amount of solidified fluid used at all. Other objects will be clarified with the following description.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
本発明工法は、図１〜図３に例示される如く、回転軸１
及び該回転軸１下側に突設された攪拌翼３Ａ，３Ｂと、
前記回転軸１に沿って設けられた供給管路２と、前記供
給管路２の上流側にセメントミルク等の固化系流動物を
導入する供給装置１０とを備え、前記回転軸１の地中へ
の貫入や引き抜き過程等で、前記供給管路２の下側吐出
口から吐出される固化系流動物と原位置土とを混合する
地盤の混合処理工法において、前記供給装置１０が、前
記流動物用の固化系供給手段１１と、圧縮エアー供給手
段１２とを有すると共に、前記供給管路２の上流側との
間に介在される混合エジェクター１３により、前記固化
系供給手段１１から導入される流動物を、前記圧縮エア
ー供給手段１２から導入される圧縮エアーに同伴させ
て、前記供給管路２を通して前記吐出口４ｂから霧状に
吐出させる構成である。また、本発明装置は、回転駆動
機構５によって回転される回転軸１及び該回転軸１下側
に突設された攪拌翼３Ａ，３Ｂと、回転軸１に沿って設
けられた供給管路２と、前記供給管路２の上流側にセメ
ントミルク等の固化系流動物を導入する供給装置１０と
を備え、前記回転軸１の地中への貫入や引き抜き過程等
で、前記供給管路２の下端側吐出口から吐出される固化
系流動物と原位置土とを混合する地盤の混合処理装置に
おいて、前記供給装置１０は、前記流動物用の固化系供
給手段１１及び圧縮エアー供給手段１２と、前記各手段
１１，１２に接続される第１と第２の入口１３ａ，１４
ａを持つ混合エジェクター１３とを有し、前記供給管路
２の上端側に前記混合エジェクター１３の排出口１３ｂ
側を接続して、前記第２の入口１４ａを介し導入される
前記流動物を、前記第１の入口１３ａを介し導入される
圧縮エアーに同伴させて前記供給管路２側へ圧送可能に
なっている構成である。In order to achieve the above object, the method of the present invention uses a rotating shaft 1 as shown in FIGS.
And stirring blades 3A and 3B protruding below the rotating shaft 1;
A supply pipe 2 provided along the rotary shaft 1 and a supply device 10 for introducing a solidified fluid such as cement milk upstream of the supply pipe 2; In the ground mixing method in which the solidified fluid discharged from the lower discharge port of the supply pipe 2 and the in-situ soil are mixed in the process of penetrating into or drawing out of the supply pipe 2, the supply device 10 It has a solidification system supply means 11 for animals and a compressed air supply means 12 and is introduced from the solidification system supply means 11 by a mixing ejector 13 interposed between the animal and the upstream side of the supply line 2. The fluid is discharged from the discharge port 4b in the form of a mist through the supply pipe 2 together with the compressed air introduced from the compressed air supply means 12. In addition, the apparatus of the present invention includes a rotating shaft 1 rotated by a rotating drive mechanism 5, stirring blades 3 </ b> A and 3 </ b> B protruding below the rotating shaft 1, and a supply line 2 provided along the rotating shaft 1. And a supply device 10 for introducing a solidified fluid such as cement milk into the upstream of the supply line 2. In the ground mixing apparatus for mixing the solidified fluid discharged from the lower end side discharge port and the in-situ soil, the supply device 10 comprises a solidification system supply means 11 and a compressed air supply means 12 for the fluid. And first and second inlets 13a, 14 connected to the respective means 11, 12
a mixing ejector 13 having a discharge port 13 b of the mixing ejector 13 at the upper end side of the supply line 2.
And the fluid introduced through the second inlet 14a can be pressure-fed to the supply pipe 2 side together with the compressed air introduced through the first inlet 13a. Configuration.
【０００７】以上の本発明思想は、固化系流動物を専用
ポンプ（グラウトポンプ等）の移送能力により供給管路
の吐出口から吐出する従来方式（以下、これを単独吐出
態様と称する）に代えて、流動物を圧縮エアーに同伴さ
せて、供給管路へ圧送し吐出口から吐出する方式（以
下、これをエアー同伴吐出態様と称する）にしたもので
ある。発明の要部は、地表側の供給装置１０として、流
動物用の固化系供給手段（例えば、グラウトポンプ等）
１１と、圧縮エアー供給手段（空気圧縮機であるコンプ
レッサー等）１２と、混合エジェクター１３とを有し、
セメントミルク等の流動物を、高速の圧縮エアーに乗せ
て、供給管路２を通して吐出口１４ｂから霧状に吐出さ
せることにあり、単独吐出態様から想像できない次のよ
うな作用効果が得られる。The concept of the present invention described above replaces the conventional method (hereinafter, referred to as a single discharge mode) in which a solidified fluid is discharged from a discharge port of a supply pipe by a transfer capability of a dedicated pump (such as a grout pump). In this method, a fluid is entrained in compressed air, fed into a supply pipe, and discharged from a discharge port (hereinafter, referred to as an air-assisted discharge mode). The main part of the invention is that a solidification system supply means (for example, a grout pump or the like) for a fluid is used as the surface-side supply device 10.
11, a compressed air supply means (such as a compressor that is an air compressor) 12, and a mixing ejector 13,
A fluid such as cement milk is put in high-speed compressed air and is discharged in a mist form from the discharge port 14b through the supply pipe 2, so that the following operation and effect that cannot be imagined from a single discharge mode can be obtained.
【０００８】第１に、本発明では、調合（密度及びフロ
ー値等）されたセメントミルク等の流動物を、圧縮エア
ーに乗せて霧状に吐出するため、圧縮エアーの噴射圧及
び流動体の供給量を制御することにより吐出力を増大す
ることが可能となる。この吐出力は、セメントミルク等
の流動物が高速エアーに乗せられ、分散又は細分化され
た状態でエアーに同伴されるため、原位置土に高速でぶ
つかり、土の塊等を粉砕したり、細分化する同時に、高
速エアーの働きで細分化した土や土粒子の流動性を効率
的に増す。このように、エアー同伴吐出態様では、原位
置土の粉砕細分化及び優れた流動化作用が構造的に充分
実現される結果、土の共廻りも防止され、混合性能を向
上できる。これは、原位置土が粘性土やビート層等の粘
着力の大きい土質、土塊になり易い硬質粘土質の場合に
も有効となり、効率的な施工を可能にする。すなわち、
従来の単独吐出態様では、流動体をグラウトポンプで圧
送する場合、当該ポンプ性能を上げたとしても、この種
の流動体の物性により吐出口から吐出される圧を高くす
ることは以外と難しく、本発明の如く吐出力によって原
位置土を粉砕することなど期待できないからである。第
２に、本発明のエアー同伴吐出態様では、前記吐出口１
４ｂが、噴射ノズル１４にて構成されると共に、前記攪
拌翼３Ａ，３Ｂの混合作動時における回転方向を向いて
いると、前記した原位置土の粉砕細分化及び流動化向上
の点からより好ましい形態となり、攪拌翼３Ａ，３Ｂに
よる攪拌混合作用も相乗的に向上できる。また、この場
合は、噴射ノズル１４の吐出口１４ｂが横方向に扁平な
開口に形成されていると、攪拌翼３Ａ又は／及び３Ｂの
ほぼ前面から吐出するため前記した各作用を混合対象領
域により均等に与えることができる。第３に、本発明の
エアー同伴吐出態様では、回転軸１が円筒形の場合、軸
上下方向に突設されて、地盤との間に隙間を形成するエ
アー回収用リブ材９を有していると、地中に吐出された
使用済みのエアーを、前記隙間から地表側へ放出して地
盤性状等に対する影響の虞を解消できる。First, according to the present invention, a fluid (such as cement milk) prepared (density and flow value, etc.) is discharged in a mist state by being put on compressed air. The discharge force can be increased by controlling the supply amount. This discharge force is such that a fluid such as cement milk is put on high-speed air and is accompanied by air in a dispersed or fragmented state. At the same time, the high-speed air works to efficiently increase the fluidity of the subdivided soil and soil particles. As described above, in the air entrainment discharge mode, the pulverization and fragmentation of the in-situ soil and the excellent fluidizing action are sufficiently realized structurally, so that the co-rotation of the soil is prevented, and the mixing performance can be improved. This is effective even when the in-situ soil is a soil having a large adhesive strength, such as a viscous soil or a beet layer, or a hard clay which tends to be a soil mass, and enables efficient construction. That is,
In the conventional single discharge mode, when the fluid is pumped by a grout pump, even if the pump performance is improved, it is difficult to increase the pressure discharged from the discharge port due to the physical properties of this kind of fluid, This is because it is not expected that the in-situ soil is crushed by the discharge force as in the present invention. Second, in the air entrainment mode of the present invention, the discharge port 1
It is more preferable that 4b is constituted by the injection nozzle 14 and is oriented in the rotation direction during the mixing operation of the stirring blades 3A and 3B from the viewpoint of the above-described in-situ pulverization and fragmentation and improvement in fluidization. As a result, the stirring and mixing action of the stirring blades 3A and 3B can be synergistically improved. Further, in this case, if the discharge port 14b of the injection nozzle 14 is formed to be a flat opening in the lateral direction, the above-described actions are performed by the mixing target region because the discharge is performed from almost the front surface of the stirring blade 3A and / or 3B. Can be given evenly. Thirdly, in the air entrainment discharge mode of the present invention, when the rotating shaft 1 is cylindrical, the rotating shaft 1 has the rib member 9 for air recovery which protrudes in the vertical direction of the shaft and forms a gap between the rotating shaft 1 and the ground. In this case, the used air discharged into the ground can be released from the gap to the surface of the ground to eliminate the possibility of affecting the ground properties and the like.
【０００９】なお、本発明の混合エジェクター１３とし
ては、例えば、略筒状の本体が内部に貫通装着されたパ
イプ部１４を有しており、筒状の一端側を圧縮エアー導
入用の第１の入口１３ａとし、他端側を供給管路２側へ
の排出口１３ｂとしてそれぞれ形成していると共に、前
記パイプ部１４の本体筒内に位置したパイプ端を前記排
出口１３ｂに向けた固化系流動物導入用の第２の入口１
４ａとして形成しているものである。The mixing ejector 13 of the present invention has, for example, a pipe portion 14 in which a substantially cylindrical main body is penetrated and mounted. One end of the cylindrical shape is a first side for introducing compressed air. Solidification system in which the other end side is formed as a discharge port 13b to the supply pipe line 2 side, and the pipe end located in the main body cylinder of the pipe portion 14 is directed toward the discharge port 13b. Second inlet 1 for fluid introduction
4a.
【００１０】[0010]
【発明の実施の形態】以下、本発明を実施形態である図
面を参照しながら更に説明する。図１は本発明の形態例
である地盤の混合処理工法に用いられる装置を模式的に
示す全体構成図、図２は同装置に用いられる回転軸及び
軸下部側の構成例を示す図、図３は噴射ノズルの構成例
を示す図、図４は混合エジェクターの構成例を示す図で
ある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be further described with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram schematically illustrating an apparatus used in a ground mixing method according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating an example of a configuration of a rotary shaft and a shaft lower side used in the apparatus. 3 is a diagram illustrating a configuration example of an injection nozzle, and FIG. 4 is a diagram illustrating a configuration example of a mixing ejector.
【００１１】図の混合処理装置は、内部中空の回転軸１
を主体とし、供給管路である供給管２、攪拌翼３Ａ、３
Ｂ、回転駆動機構５及びスイベル管６、固化系供給手段
１１及び圧縮エアー供給手段１２並びに混合エジェクタ
ー１３を組とした供給装置１０等を備え、供給管２に対
しホース１４等を介して固化系流動体を圧縮エアーに乗
せて圧送可能にしたものである。The mixing apparatus shown in FIG.
, The supply pipe 2, which is a supply pipe, the stirring blades 3A, 3
B, a rotary drive mechanism 5 and a swivel pipe 6, a supply system 10 including a solidification system supply unit 11, a compressed air supply unit 12, and a mixing ejector 13, and the like. The solidification system is connected to the supply tube 2 via a hose 14 and the like. The fluid is put on compressed air and can be sent under pressure.
【００１２】ここで、回転軸１は有底筒状をなし、内部
上下方向に沿って供給管２を配置しており、軸下端側に
２段に設けられてそれぞれ２枚構成の攪拌翼３Ａ、３Ｂ
と、攪拌翼３Ｂに設けられた噴射ノズル４を有し、上端
側に設けられる回転駆動機構５により回転される。すな
わち、施工時には、例えば、回転軸１が図示を省略して
いるベースマシン側の支持用リーダー７及びウインチ機
構等を介して移動可能に支持されて、地盤下へ貫入され
たり、引き抜かれる。回転駆動機構５は、回転軸１を電
動モーター及び減速ギア機構等を介して正転・逆転する
もので、回転軸１を連行しながらリーダー６に沿って昇
降される。The rotating shaft 1 has a cylindrical shape with a bottom, and a supply pipe 2 is arranged along the inner vertical direction. The rotating shaft 1 is provided in two stages at the lower end of the shaft and each has a two-piece stirring blade 3A. , 3B
And an injection nozzle 4 provided on the stirring blade 3B, and rotated by a rotation drive mechanism 5 provided on the upper end side. That is, at the time of construction, for example, the rotating shaft 1 is movably supported via a support leader 7 and a winch mechanism on the base machine (not shown), and is penetrated or pulled under the ground. The rotation drive mechanism 5 rotates the rotation shaft 1 forward / reverse via an electric motor, a reduction gear mechanism, and the like, and moves up and down along the reader 6 while entraining the rotation shaft 1.
【００１３】回転軸１の下端には図２（ａ）に示す如く
掘削刃８が必要に応じて装着される。回転軸１の外周に
は、エアー回収用リブ材９が対に設けられている。この
リブ材７は、鋼板を溶接したもので、攪拌翼３Ａ，３Ｂ
同士の間と、攪拌翼３Ｂの上つまりて回転軸１の上下方
向へ延びている。リブ材９の突出量は、回転軸１が回転
されるときに軸外周と原位置土との間に隙間を形成し、
その隙間を介して噴射ノズル４から吐出されるエアーを
地表側へ放出し易くなるよう設定される。したがって、
このようなリブ材９は、図２（ｂ）に示す如く回転軸２
１が断面矩形である場合、該回転軸２１自身により同様
な隙間を形成することから省略される。An excavating blade 8 is mounted on the lower end of the rotating shaft 1 as required, as shown in FIG. On the outer periphery of the rotating shaft 1, air recovery rib members 9 are provided in pairs. The rib member 7 is formed by welding a steel plate, and is provided with stirring blades 3A and 3B.
It extends between them and above the stirring blade 3B, that is, in the vertical direction of the rotating shaft 1. The projecting amount of the rib material 9 forms a gap between the outer periphery of the shaft and the in-situ soil when the rotating shaft 1 is rotated,
The air discharged from the injection nozzle 4 through the gap is set to be easily discharged to the ground surface side. Therefore,
As shown in FIG. 2B, the rib material 9 is
When 1 is rectangular in cross section, it is omitted because a similar gap is formed by the rotating shaft 21 itself.
【００１４】供給管２は、供給管路を形成するものであ
るが、回転軸１の内径自体を供給管路としてもよい。こ
の供給管２の上端は、スイベル管６の上蓋６ａを貫通
し、供給装置１０の混合エジェクター１３との間に介在
されるホース１４の一端側と接続具２０ａにより接続さ
れている。下端側は、軸外へ貫通されて、攪拌翼３Ｂに
装着された噴射ノズル４に接続具２０ｂ等を介し接続さ
れている。噴射ノズル４は、本体４ａが所定圧を受ける
と噴射可能になる開閉弁付きのものであり、図３に示す
如く扁平な吐出口４ｂに形成されている。そして、攪拌
翼３Ｂの下面略中間に装着されて、吐出口４ｂが攪拌翼
４Ｂの回転方向を向いた状態となっている。なお、この
噴射ノズル４は、上下の攪拌翼４Ａ，４Ｂに対し装着し
たり、吐出口４ｂを露出させた状態で内蔵させることも
ある。The supply pipe 2 forms a supply pipe, but the inner diameter of the rotary shaft 1 itself may be used as the supply pipe. The upper end of the supply pipe 2 passes through the upper lid 6a of the swivel pipe 6, and is connected to one end of a hose 14 interposed between the supply pipe 10 and the mixing ejector 13 by a connector 20a. The lower end is penetrated off-axis and connected to the injection nozzle 4 mounted on the stirring blade 3B via a connector 20b or the like. The injection nozzle 4 is provided with an on-off valve that enables injection when the main body 4a receives a predetermined pressure, and is formed in a flat discharge port 4b as shown in FIG. The discharge port 4b is mounted substantially at the center of the lower surface of the stirring blade 3B so that the discharge port 4b faces the rotation direction of the stirring blade 4B. The injection nozzle 4 may be attached to the upper and lower stirring blades 4A and 4B, or may be built in with the discharge port 4b exposed.
【００１５】ホース１４は、変形自在な管であり、下流
側が供給装置１０へ延びている。供給装置１０は、固化
系供給手段１１及び圧縮エアー供給手段１２を主体に構
成されている。圧縮エアー供給手段１１は、コンプレッ
サー１７及びレシーバータンク１８からなり、コンプレ
ッサー１７の駆動により生成される圧縮エアーがレシー
バータンク１８に貯蔵される。レシーバータンク１８と
混合エジェクター１３（後述する第１の入口１４ａ）と
の間はパイプ１９ａで接続されており、レシーバータン
ク１８内の圧縮エアーは、不図示のバルブ操作により混
合エジェクター１３に圧送される。固化系供給手段１１
は、製造されたセメントミルク等をストックするアジテ
ータ部１６及びグラウトポンプ１７からなり、ポンプ１
７と混合エジェクター１３（後述する第２の入口１４
ａ）との間はパイプ１９ｂで接続されている。そして、
アジテータ部１６の流動物は、ポンプ１７が駆動される
ことにより、混合エジェクター１３に移送される。な
お、アジテータ部１６は、セメントミルク等の流動物を
製造するプラント自体であったり、アジテータ車等によ
り構成されることもある。The hose 14 is a deformable tube, and the downstream side extends to the supply device 10. The supply device 10 mainly includes a solidification system supply unit 11 and a compressed air supply unit 12. The compressed air supply means 11 includes a compressor 17 and a receiver tank 18, and compressed air generated by driving the compressor 17 is stored in the receiver tank 18. A pipe 19a is connected between the receiver tank 18 and the mixing ejector 13 (a first inlet 14a to be described later), and the compressed air in the receiver tank 18 is sent to the mixing ejector 13 by a valve operation (not shown). . Solidification system supply means 11
Consists of an agitator section 16 for stocking manufactured cement milk and the like and a grout pump 17, and the pump 1
7 and the mixing ejector 13 (a second inlet 14 described later)
a) is connected by a pipe 19b. And
The fluid in the agitator section 16 is transferred to the mixing ejector 13 by driving the pump 17. The agitator unit 16 may be a plant that manufactures a fluid such as cement milk, or may be constituted by an agitator vehicle or the like.
【００１６】混合エジェクター１３は、図４に示す如
く、略筒状の本体からなり、第２の入口を形成するパイ
プ部１４を有している。一端側はエアー導入用の第１の
入口１３ａに形成され、他端側は多少細く絞られた排出
口１３ｂに形成されている。パイプ部１４は、筒状本体
に対し傾きを持って貫通配置され、挿入端側が筒状内の
略中央に位置し、排出口１３ｂ側へ折り曲げられて、排
出口１３ｂに対抗した第２の入口１４ａを形成してい
る。そして、第１の入口１３ａは、レシーバータンク１
８の出口との間にパイプ１９ａを介し接続されて、圧縮
エアーを導入する。第２の入口１４ａは、ポンプ１５の
出口との間にパイプ１９ｂを介し接続させて、固化系流
動物を導入する。なお、図４中、符号２０ｃは第１の入
口１３ａにパイプ１９ａの対応端を連結する接続具であ
り、符号２０ｄはパイプ部１４の外側端部にパイプ１９
ｂの対応端を連結する接続具である。As shown in FIG. 4, the mixing ejector 13 is formed of a substantially cylindrical main body, and has a pipe portion 14 forming a second inlet. One end is formed at a first inlet 13a for air introduction, and the other end is formed at a slightly narrowed outlet 13b. The pipe portion 14 is disposed so as to penetrate the tubular main body at an angle with respect to the tubular main body, the insertion end side is located substantially in the center of the tubular shape, and is bent toward the discharge port 13b side, and the second inlet opposed to the discharge port 13b. 14a. The first inlet 13a is connected to the receiver tank 1
8 is connected via a pipe 19a to the outlet of the nozzle 8 to introduce compressed air. The second inlet 14a is connected to the outlet of the pump 15 via a pipe 19b to introduce a solidified fluid. In FIG. 4, reference numeral 20c denotes a connector for connecting a corresponding end of the pipe 19a to the first inlet 13a, and reference numeral 20d denotes a pipe 19 at an outer end of the pipe portion 14.
It is a connecting tool for connecting corresponding ends of b.
【００１７】次に、以上の混合処理装置の処理操作につ
いて概説する。施工に際しては、混合処理装置が施工箇
所に移動されて位置決めされた後、回転軸１が回転され
ながら貫入操作される。回転軸１は従来と同様に上端部
に連結された回転駆動機構５により回転されて、所定の
深さまで貫入される。そして、この貫入過程又は／及び
引き抜き過程にて混合操作が行われる。すなわち、混合
処理段階では供給装置１０が稼動される。すると、アジ
テータ部１６の流動物は、ポンプ１５によりパイプ１９
ｂ及び第２の入口１４ａから混合エジェクター１３内に
移送される。移送された流動物は、レシーバータンク１
８及びパイプ１９ａと第１の入口１３ａを介し導入され
る圧縮エアーに乗せられて、排出口１３ｂからホース１
４へ同伴され、更に供給管路２を通って噴射ノズル４の
吐出口１４ｂから地中の原位置土へ向けて吐出する。こ
の吐出態様は、流動物が高速の圧縮エアーに同伴して霧
状に吐出されて、攪拌翼３Ｂの回転軌跡において、攪拌
翼３Ｂの回転方向である前方へ霧状に噴射している。こ
のようなエアー同伴吐出態様では、圧縮エアーの噴射圧
及び流動体の供給量を制御することにより吐出力ないし
は噴射力を増大することができ、その吐出力ないしは噴
射力により原位置土に高速でぶつかり、例えば、翼前方
に存在する土の塊等を粉砕したり、細分化すると共に、
細分化した土や土粒子の流動性も効率的に高めることが
できる。なお、上述の混合エジェクター１３は、第２の
入口１４ａが筒中央に位置していると共に、第１の入口
１３ａと排出口１３ｂとの間に設けられているため、第
２の入口１４ａから導入される固化系流動物を、第１の
入口１３ａから導入される圧縮エアー上に乗せて排出口
１３ｂ、更にホース１４側へ効率よく同伴させることが
できる。Next, the processing operation of the above-mentioned mixing apparatus will be outlined. At the time of construction, after the mixing apparatus is moved to the construction site and positioned, the penetration operation is performed while rotating the rotating shaft 1. The rotation shaft 1 is rotated by a rotation drive mechanism 5 connected to the upper end portion as in the conventional case, and penetrates to a predetermined depth. Then, the mixing operation is performed in the penetration process and / or the drawing process. That is, the supply device 10 is operated in the mixing stage. Then, the fluid of the agitator section 16 is pumped by the pump 15 into the pipe 19.
b and from the second inlet 14 a into the mixing ejector 13. The transferred fluid is stored in the receiver tank 1
8 and the compressed air introduced through the pipe 19a and the first inlet 13a, and the hose 1 from the outlet 13b.
4, and is further discharged from the discharge port 14 b of the injection nozzle 4 through the supply pipe line 2 toward the underground in-situ soil. In this discharge mode, the fluid is discharged in the form of a mist accompanying the high-speed compressed air, and is sprayed in the form of a mist on the rotation trajectory of the stirring blade 3B in the forward direction, which is the rotation direction of the stirring blade 3B. In such an air-assisted ejection mode, the ejection force or the ejection force can be increased by controlling the ejection pressure of the compressed air and the supply amount of the fluid, and the ejection force or the ejection force can be applied to the in-situ soil at a high speed. Collision, for example, crushing and crushing the lump of soil existing in front of the wing,
The fluidity of the subdivided soil and soil particles can also be efficiently increased. The above-mentioned mixing ejector 13 is introduced from the second inlet 14a because the second inlet 14a is located at the center of the cylinder and is provided between the first inlet 13a and the outlet 13b. The solidified fluid thus obtained can be put on the compressed air introduced from the first inlet 13a and efficiently entrained to the outlet 13b and the hose 14 side.
【００１８】図５及び図６は本発明を２軸構成の混合処
理装置に適用した例を示している。すなわち、本発明の
混合処理工法及び装置は、図１の如く回転軸１が単軸構
成の場合に限られず、図５及び図６の如く２軸構成の場
合もある。なお、図５及び図６では、上記形態に対し同
じか作用的に類似する部材に同じ符号を付して、重複し
た説明を省く。FIGS. 5 and 6 show an example in which the present invention is applied to a mixing apparatus having a two-axis configuration. That is, the mixing method and the apparatus of the present invention are not limited to the case where the rotating shaft 1 has a single-shaft configuration as shown in FIG. 1, and may have a two-shaft configuration as shown in FIGS. 5 and 6. In FIGS. 5 and 6, members that are the same as or functionally similar to the above-described embodiment are denoted by the same reference numerals, and redundant description will be omitted.
【００１９】図５の装置構成は、上側に設置される回転
駆動機構により回転される２本の回転軸１と、各回転軸
１の下端側にあって上下各２段に取り付けられた攪拌翼
３Ａ，３Ｂと、各回転軸１の下端に装着された掘削刃８
と、両回転軸１の間に組み込まれた共廻り防止板２２と
を有し、各回転軸１の攪拌翼３Ａ，３同士が互いの回転
軌跡の一部を接円する状態に配置されるとともに、上記
した供給管路である供給管を一方の回転軸１、又は両回
転軸１内に配管している。また、共廻り防止板２２は、
各回転軸１の外周に嵌合している取付部２３同士を防止
板２４により連結した構成であり、回転軸１同士の間隔
を維持し、かつ攪拌翼３Ａ，３Ｂの回転に伴う土の移動
を阻止する。The apparatus shown in FIG. 5 has two rotating shafts 1 rotated by a rotating drive mechanism installed on the upper side, and stirring blades attached to the lower end of each rotating shaft 1 and mounted on upper and lower two stages. 3A, 3B and a digging blade 8 attached to the lower end of each rotating shaft 1
And a counter-rotating plate 22 incorporated between the two rotating shafts 1, and the stirring blades 3 </ b> A and 3 of each rotating shaft 1 are arranged in a state in which a part of their rotation trajectories is tangent to each other. At the same time, the supply pipe, which is the above-described supply pipe, is provided in one of the rotation shafts 1 or both of the rotation shafts 1. In addition, the co-rotation prevention plate 22 is
The mounting portions 23 fitted to the outer periphery of each rotary shaft 1 are connected to each other by a prevention plate 24, so that the distance between the rotary shafts 1 is maintained, and the movement of soil due to the rotation of the stirring blades 3A, 3B. To block.
【００２０】これに対し、図６の装置構成は、上側に設
置される回転駆動機構により回転される２本の回転軸１
と、各回転軸１の下端側にあって上下各２段に取り付け
られた攪拌翼３Ａ，３Ｂと、両回転軸１の間に設けられ
て固化系流動物の使用量に応じ原地盤土壌を排土するス
クリューオーガー２６を内設した排土管２５とを備えた
タイプであり、上記した供給管路である供給管を両方の
回転軸１内に配管し、それに対応して設けられた噴射ノ
ズル１３を上下の攪拌翼３Ａ，３Ｂにそれぞれ有してい
る。このタイプは、例えば、上記の混合処理に先立ち、
スクリューオーガー２６の排土作用によって原地盤土壌
の設計量を地上側へ排除し、地盤の盛り上がり等を防止
するものである。そして、本発明は、図６のような排土
管２５を利用して、上記した使用後のエアーを地中から
放出することも考えられる。On the other hand, the apparatus shown in FIG. 6 has two rotating shafts 1 rotated by a rotating drive mechanism installed on the upper side.
And stirring blades 3A and 3B provided at the lower end side of each rotating shaft 1 and mounted on each of the upper and lower two stages, and provided between the rotating shafts 1 to remove the original ground soil according to the amount of solidified fluid used. And a discharge pipe 25 in which a screw auger 26 for discharging the soil is provided. 13 is provided on the upper and lower stirring blades 3A and 3B, respectively. This type, for example, prior to the mixing process described above,
The unloading action of the screw auger 26 removes the design amount of the original ground soil to the ground side, thereby preventing the ground from rising. In the present invention, it is also conceivable that the above-mentioned used air is discharged from the ground using the discharge pipe 25 as shown in FIG.
【００２１】このように、本発明は、混合処理装置のタ
イプに制約されることなく、他の公知のものにも必要に
応じて適用可能であり、要は請求項１又は４に記載の技
術要件を具備すればよいものである。As described above, the present invention is not limited to the type of the mixing apparatus, but can be applied to other known apparatuses as required. It is only necessary to satisfy the requirements.
【００２２】[0022]
【発明の効果】以上説明したように、本発明によれば、
セメントミルク等の固化系流動物を、圧縮エアーに乗せ
て霧状に吐出することから、攪拌翼の混合作用に加え、
原位置土の粉砕細分化及び優れた流動化作用が実現され
ると共に、土の共廻りも防止して混合性能を向上でき
る。そして、このように、均一混合をより向上できるこ
とから、より高速な施工を可能にしたり、造成パイル径
を大きくしたり、品質を維持して原料である流動物の使
用量を多少なりとも節減可能にして、工費の低減に寄与
できる。As described above, according to the present invention,
Since the solidified fluid such as cement milk is ejected in a mist state by putting it on compressed air, in addition to the mixing action of the stirring blade,
In addition to the pulverization and fragmentation of the in-situ soil and excellent fluidizing action, the mixing performance can be improved by preventing the soil from turning around. In addition, since uniform mixing can be improved in this way, it is possible to achieve higher speed construction, increase the creation pile diameter, maintain quality, and somewhat reduce the amount of fluid used as raw material In this way, it is possible to contribute to a reduction in construction cost.
【図１】本発明形態例の地盤の混合処理工法を示す模式
全体構成図である。FIG. 1 is a schematic overall configuration diagram showing a ground mixing method according to an embodiment of the present invention.
【図２】上記工法で用いられる回転軸及びその下部構成
例を示す図である。FIG. 2 is a diagram showing a rotation shaft used in the above-mentioned method and an example of a lower configuration thereof.
【図３】上記工法で用いられる噴射ノズルの構成例を示
す図である。FIG. 3 is a diagram showing a configuration example of an injection nozzle used in the above-mentioned method.
【図４】上記工法で用いられる混合エジェクターの構成
例を示す図である。FIG. 4 is a diagram showing a configuration example of a mixing ejector used in the above method.
【図５】本発明の混合処理工法について他の２例を示す
説明用参考図である。FIG. 5 is an explanatory reference view showing another two examples of the mixing treatment method of the present invention.
１は回転軸 ２は供給管路 ３Ａ，３Ｂは攪拌翼 ４は噴射ノズル １０は供給装置 １１は固化系供給手段 １２は圧縮エアー供給手段 １３は混合エジェクター １３ａ，１４ａは第１と第２の入口 １３ｂは排出口 1 is a rotating shaft 2 is a supply pipe 3A, 3B is a stirring blade 4 is an injection nozzle 10 is a supply device 11 is a solidifying system supply means 12 is a compressed air supply means 13 is a mixing ejector 13a, 14a is a first and a second inlet 13b is an outlet
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松尾 伸太郎 埼玉県北葛飾郡杉戸町高野台西６丁目１ 15−８−104 (72)発明者 磯谷 修二 茨城県古河市雷電町11−10 (72)発明者 谷口 利久 茨城県猿島郡総和町大字下大野2589−２ (72)発明者 城浦 秀男 大阪府大阪市北区長柄東２−１ 24棟408 Ｆターム(参考） 2D040 AB03 AC04 AC05 BA02 BA08 BD05 CA01 CB03 CD02 DA11 EA11 EA12 EA18 EA21 EB00 EB01 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shintaro Matsuo 6-1-1-1 Takanodai, Sugito-cho, Kita-Katsushika-gun, Saitama 15-8-104 (72) Inventor Shuji Isoya 11-10 Raidencho, Furukawa-shi, Ibaraki Inventor Toshihisa Taniguchi 2589-2 Shimo-Ono, Sowa-cho, Sarushima-gun, Ibaraki Pref. CA01 CB03 CD02 DA11 EA11 EA12 EA18 EA21 EB00 EB01
Claims (4)
翼と、前記回転軸に沿って設けられた供給管路と、前記
供給管路の上流側にセメントミルク等の固化系流動物を
導入する供給装置とを備え、前記回転軸の地中への貫入
や引き抜き過程等で、前記供給管路の下側吐出口から吐
出される固化系流動物と原位置土とを混合する地盤の混
合処理工法において、 前記供給装置が、前記流動物用の固化系供給手段と、圧
縮エアー供給手段とを有すると共に、前記供給管路の上
流側との間に介在される混合エジェクターにより、前記
固化系供給手段から導入される流動物を、前記圧縮エア
ー供給手段から導入される圧縮エアーに同伴させて、前
記供給管路を通して前記吐出口から霧状に吐出させるこ
とを特徴とする地盤の混合処理工法。1. A rotating shaft, a stirring blade protruding below the rotating shaft, a supply line provided along the rotating shaft, and a solidification system such as cement milk provided upstream of the supply line. A supply device for introducing a fluid, and mixing the solidified fluid and the in-situ soil discharged from the lower discharge port of the supply pipe in a process of penetrating or drawing out the rotary shaft into the ground, and the like. In the ground mixing method, the supply device has a solidification system supply unit for the fluid and a compressed air supply unit, and a mixing ejector interposed between the supply line and the upstream side of the supply line. Wherein the fluid introduced from the solidification system supply means is accompanied by the compressed air introduced from the compressed air supply means, and is discharged in a mist form from the discharge port through the supply pipe. Mixed processing method.
かつ前記攪拌翼の混合作動時の回転方向を向いている請
求項１に記載の地盤の混合処理工法。2. The discharge port is constituted by an injection nozzle,
The ground mixing method according to claim 1, wherein the mixing blade is oriented in a rotation direction during the mixing operation.
るエアー回収用リブ材を有している請求項１又は２に記
載の地盤の混合処理工法。3. The ground mixing method according to claim 1, wherein the rotating shaft has an air collecting rib member that forms a gap between the rotating shaft and the ground.
び該回転軸下側に突設された攪拌翼と、回転軸に沿って
設けられた供給管路と、前記供給管路の上流側にセメン
トミルク等の固化系流動物を導入する供給装置とを備
え、前記回転軸の地中への貫入や引き抜き過程等で、前
記供給管路の下端側吐出口から吐出される固化系流動物
と原位置土とを混合する地盤の混合処理装置において、 前記供給装置は、前記流動物用の固化系供給手段及び圧
縮エアー供給手段と、前記各手段に接続される第１と第
２の入口を持つ混合エジェクターとを有し、前記供給管
路の上端側に前記混合エジェクターの排出口側を接続し
て、前記第２の入口を介し導入される前記流動物を、前
記第１の入口を介し導入される圧縮エアーに同伴させて
前記供給管路側へ圧送可能になっていることを特徴とす
る地盤の混合処理装置。4. A rotary shaft rotated by a rotary drive mechanism, a stirring blade protruding below the rotary shaft, a supply line provided along the rotary shaft, and an upstream side of the supply line. A supply device for introducing a solidified fluid such as cement milk, and the solidified fluid discharged from a lower discharge port of the supply pipe in a process of penetrating or drawing out the rotary shaft into the ground, and the like. In a mixing apparatus for ground that mixes in situ soil, the supply device includes a solidification system supply unit and a compressed air supply unit for the fluid, and first and second inlets connected to the units. Having a mixing ejector, and connecting the outlet side of the mixing ejector to the upper end side of the supply pipe, and allowing the fluid introduced through the second inlet to flow through the first inlet. Pressure is applied to the supply line side together with the introduced compressed air. A ground mixing apparatus characterized in that it can be sent.
Priority Applications (1)
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| JP10020299A JP3389527B2 (en) | 1999-04-07 | 1999-04-07 | Ground mixing method |
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| JP10020299A JP3389527B2 (en) | 1999-04-07 | 1999-04-07 | Ground mixing method |
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| JP2000290993A true JP2000290993A (en) | 2000-10-17 |
| JP3389527B2 JP3389527B2 (en) | 2003-03-24 |
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Cited By (15)
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| JP2001329529A (en) * | 2000-05-23 | 2001-11-30 | Toa Kohatsu Kk | Soft ground improving method and apparatus |
| JP2002192142A (en) * | 2000-12-27 | 2002-07-10 | Fudo Constr Co Ltd | Method for cleaning polluted ground |
| JP2003184070A (en) * | 2001-12-12 | 2003-07-03 | Fudo Constr Co Ltd | Apparatus and construction method for solidification treatment for surface layer part of ultra-soft ground |
| JP2003213664A (en) * | 2002-01-23 | 2003-07-30 | Yamashin Kogyo Kk | Chemical injection method, chemical injection device and soil purification method |
| JP2004019276A (en) * | 2002-06-18 | 2004-01-22 | Kato Construction Co Ltd | Ground improving construction method |
| JP2004027494A (en) * | 2002-06-21 | 2004-01-29 | Yamashin Kogyo Kk | Foundation improvement method and construction machinery |
| JP2006241935A (en) * | 2005-03-07 | 2006-09-14 | Fudo Constr Co Ltd | Soil improvement device and soil improvement method |
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| JP2001329529A (en) * | 2000-05-23 | 2001-11-30 | Toa Kohatsu Kk | Soft ground improving method and apparatus |
| JP2002192142A (en) * | 2000-12-27 | 2002-07-10 | Fudo Constr Co Ltd | Method for cleaning polluted ground |
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| JP2004019276A (en) * | 2002-06-18 | 2004-01-22 | Kato Construction Co Ltd | Ground improving construction method |
| JP2004027494A (en) * | 2002-06-21 | 2004-01-29 | Yamashin Kogyo Kk | Foundation improvement method and construction machinery |
| JP2006241935A (en) * | 2005-03-07 | 2006-09-14 | Fudo Constr Co Ltd | Soil improvement device and soil improvement method |
| JP2010209556A (en) * | 2009-03-09 | 2010-09-24 | Takenaka Komuten Co Ltd | Fiber-reinforced cement ground improvement device and fiber-reinforced cement ground improvement method |
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| JP2018178518A (en) * | 2017-04-12 | 2018-11-15 | 五洋建設株式会社 | Inner pressure relaxation blade setting method |
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