JP4950493B2 - Ground improvement machine and ground improvement system - Google Patents

Ground improvement machine and ground improvement system Download PDF

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JP4950493B2
JP4950493B2 JP2006008252A JP2006008252A JP4950493B2 JP 4950493 B2 JP4950493 B2 JP 4950493B2 JP 2006008252 A JP2006008252 A JP 2006008252A JP 2006008252 A JP2006008252 A JP 2006008252A JP 4950493 B2 JP4950493 B2 JP 4950493B2
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injection
ground improvement
reaction material
hose
stirring shaft
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JP2007191855A (en
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正浩 江口
吉昭 長谷部
裕章 目黒
秀敏 森本
英夫 柳原
聡一 多田
耕造 武田
哲 岡島
伸英 木下
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JDC Corp
Organo Corp
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Organo Corp
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Description

本発明は、地盤改良機および地盤改良システムに関する。   The present invention relates to a ground improvement machine and a ground improvement system.

従来より、粉体浄化材として微細鉄粉を、また反応材としてリン酸と過酸化水素との混合液等を地中に圧送注入して原位置の汚染土壌と攪拌し、その土壌中のトリクロロエチレン等の汚染物質を分解し浄化する地盤改良工法（触媒酸化法）が行われている。
この工法では、各種の地盤改良機（たとえば、特許文献１参照。）が使用されているが、その一つとして図８に示したようなものがある。 Conventionally, fine iron powder as a powder purification material and a mixed solution of phosphoric acid and hydrogen peroxide as a reaction material are pumped into the ground and stirred with the contaminated soil in situ, and trichlorethylene in the soil A ground improvement method (catalytic oxidation method) that decomposes and purifies pollutants such as these has been carried out.
In this construction method, various ground improvement machines (see, for example, Patent Document 1) are used, and one of them is shown in FIG.

この地盤改良機１は、高さ２０ｍ程度のリーダ２を備えたベースマシン３に、下端に攪拌翼４を有する攪拌軸５を回転自在に、かつ昇降自在に支持させているものである。
その攪拌軸５は、粉体浄化材供給ライン６よりエア圧送される粉体浄化材を、その内部を通じて上記攪拌翼４まで送給し浄化材噴出孔（図示しない）より地中に噴出させることができるようになっており、また、この攪拌軸５に沿わせて、上記反応材を上記攪拌翼４付近に送給する反応材注入ホース７が、該撹拌軸５とともに昇降するように、その上下部を固定して配設されている。 In the ground improvement machine 1, a base machine 3 having a leader 2 having a height of about 20 m supports a stirring shaft 5 having a stirring blade 4 at its lower end so that the stirring shaft 5 is rotatable and can be raised and lowered.
The agitation shaft 5 feeds the powder purification material air-fed from the powder purification material supply line 6 to the agitation blade 4 through the inside thereof and ejects it from the purification material ejection hole (not shown) into the ground. The reaction material injection hose 7 for feeding the reaction material to the vicinity of the stirring blade 4 along the stirring shaft 5 is moved up and down together with the stirring shaft 5. The upper and lower parts are fixed.

上記の地盤改良機１による地盤改良は、上記反応材注入ホース７下端の注入ノズルに土が詰まらないよう、そこから水を噴射させながら上記撹拌軸５を降下させて攪拌翼４を地中所要深さまで貫入させ、その後、これを回転させながら引上げるのと同時に、上記粉体浄化材を、上記攪拌翼４の浄化材噴出孔から噴出させ、また、上記注入ノズルから反応材を噴出させることにより、その粉体浄化材および反応材を土壌と攪拌して行われる。
特開２００４−２９０８６１ The ground improvement by the ground improvement machine 1 requires the stirring blade 4 to be grounded by lowering the stirring shaft 5 while spraying water so that the injection nozzle at the lower end of the reaction material injection hose 7 is not clogged with soil. Penetration to the depth, and then pulling up while rotating the powder, the powder purification material is ejected from the purification material ejection hole of the stirring blade 4, and the reaction material is ejected from the injection nozzle Thus, the powder purification material and the reaction material are stirred with soil.
JP-A-2004290861

しかしながら、第１に、上記の通り、攪拌軸５を降下させる際には上記注入ノズルの土詰まりを防止するため該注入ノズルより水を噴射させていたので、周辺地盤が泥濘化してバックホウの走行すら困難になるなど、その後の作業に差し支えることがあった。   However, first, as described above, when the stirring shaft 5 is lowered, water is injected from the injection nozzle in order to prevent clogging of the injection nozzle, so that the surrounding ground becomes muddy and the backhoe travels. Even if it became even difficult, there were times when it supported the subsequent work.

また、第２に、上記反応材注入ホース７は、長尺かつ小径のものであるため、攪拌軸５を引き上げる際に土砂との摩擦により座屈してしまい、攪拌軸５を引き上げながらその反応材注入ホース７を通じて行う反応材の供給が不可能になることがあった。   Second, since the reaction material injection hose 7 is long and has a small diameter, when the stirring shaft 5 is pulled up, it is buckled by friction with the earth and sand, and the reaction material is injected while the stirring shaft 5 is pulled up. In some cases, the supply of the reaction material through the injection hose 7 becomes impossible.

また、第３に、粉体浄化材供給ライン６が、その内部を圧送される粉体浄化材により摩耗し破損することがあり、この場合には粉体浄化材が周囲へ飛散して、その周辺環境へ与える被害が甚大になってしまうということがあった。   Third, the powder purification material supply line 6 may be worn and damaged by the powder purification material pumped inside. In this case, the powder purification material is scattered to the surroundings. The damage to the surrounding environment was severe.

そこで、本発明は、これらの問題を解決し、注入ノズルの土詰まりならびに反応材注入ホースの座屈を防止した地盤改良機、および、粉体浄化材供給ラインが破損した際に粉体浄化材が飛散することを防止し、かついち早くその破損を検知できる地盤改良システムの提供を目的とする。   Therefore, the present invention solves these problems, and improves the grounding machine that prevents clogging of the injection nozzle and buckling of the reaction material injection hose, and the powder purification material when the powder purification material supply line is broken. An object of the present invention is to provide a ground improvement system that can prevent splattering and can quickly detect damage.

請求項１記載の本発明は、ベースマシン１０’のリーダ１１に、撹拌軸１２と反応材注入手段１３とを備えた注入攪拌装置１４を昇降自在に支持してなる地盤改良機において、
<i> 上記注入攪拌装置１４の攪拌軸１２が、上記リーダ１１に沿って昇降自在な上部軸受１６に回転自在に支持されるとともに、その下部にブレ止めスペーサ１７を取り付けていると共に、
<ii> 上記反応材注入手段１３が、下部を上記ブレ止めスペーサ１７に固定し、上部を上部軸受１６に上下摺動自在に支持させた注入ホース保護管１８に、反応材を注入ノズル２０へ送給する反応材注入ホース１９を挿通させて構成され、
<iii> 上記反応材注入ホース１９が耐薬品性を有し、上記注入ホース保護管１８が鋼製である一方、
<iv> 上記注入ホース保護管１８の上部は、該注入ホース保護管１８より大径のガイド管に上下摺動自在に挿通されて前記上部軸受１６に支持されている
ことを特徴とする地盤改良機である。
The present invention described in claim 1 is a ground improvement machine comprising a reader 11 of a base machine 10 'supporting an injection stirring device 14 having a stirring shaft 12 and a reaction material injection means 13 so as to be movable up and down.
stirring shaft 12 of the <i> the injection stirrer 14 is rotatably supported on the vertically movable upper bearing 16 along the reader 11, the attach the blur stop spacer 17 thereunder,
<ii> The reaction material injection means 13 fixes the reaction material to the injection nozzle 20 in the injection hose protective tube 18 whose lower portion is fixed to the anti-blur spacer 17 and whose upper portion is supported by the upper bearing 16 so as to slide up and down. It is configured by inserting a reaction material injection hose 19 to be fed ,
<iii> While the reaction material injection hose 19 has chemical resistance and the injection hose protective tube 18 is made of steel,
<iv> The upper portion of the injection hose protection pipe 18 is inserted into a guide pipe having a larger diameter than the injection hose protection pipe 18 so as to be slidable in the vertical direction and supported by the upper bearing 16.
It is a ground improvement machine characterized by this.

請求項２記載の本発明は、上記反応材注入手段１３の注入ノズル２０の注入管２０ｂの先端に、可撓性を有する管状のノズルカバー２０ｃを嵌着してなる請求項１記載の地盤改良機である。
The present invention according to claim 2 is the ground improvement according to claim 1 , wherein a flexible tubular nozzle cover 20c is fitted to the tip of the injection tube 20b of the injection nozzle 20 of the reaction material injection means 13. Machine.

請求項３記載の本発明は、上記注入ノズル２０が、分岐管２０ａに、可撓性を有する管状のノズルカバー２０ｃを嵌着した複数本の注入管２０ｂ……を分岐接続してなる請求項２記載の地盤改良機である。
The present invention described in claim 3 is characterized in that the injection nozzle 20 is formed by branching and connecting a plurality of injection pipes 20b... In which a flexible tubular nozzle cover 20c is fitted to the branch pipe 20a. The ground improvement machine according to 2 .

請求項４記載の本発明地盤改良システムは、ベースマシン１０’のリーダ１１に、撹拌軸１２と反応材注入手段１３とを備えた注入攪拌装置１４を昇降自在に支持した地盤改良機１０の上記攪拌軸１２に接続された粉体浄化材供給ラインが、外側管２７，３２内に内側管２６，３０を挿通した二重管構造をなし、その内管２６，３０内を、上記攪拌軸１２内部の浄化材送給路１２”へ粉体浄化材を供給する粉体浄化材供給路αとし、その外側に、上記攪拌軸１２側端部を閉塞した排出路βを形成しているとともに、上記粉体浄化材送給ラインの途中部分を漏気検知槽３７に通し、上記排出路βの排出口３２’を該漏気検知槽３７内で水中に沈めているものである。
The ground improvement system of the present invention according to claim 4 is the above-described ground improvement machine 10 in which the leader 11 of the base machine 10 'supports the injection stirring device 14 provided with the stirring shaft 12 and the reaction material injection means 13 so as to be movable up and down. The powder purification material supply line connected to the stirring shaft 12 has a double tube structure in which the inner tubes 26 and 30 are inserted into the outer tubes 27 and 32, and the inner tubes 26 and 30 are disposed inside the stirring shaft 12. A powder purification material supply path α for supplying the powder purification material to the internal purification material supply path 12 ″ is formed, and a discharge path β is formed outside the stirring shaft 12 side end, and An intermediate portion of the powder purification material supply line is passed through the air leak detection tank 37, and the discharge port 32 'of the discharge path β is submerged in the air in the air leak detection tank 37.

請求項５記載の本発明は、<i>上記注入攪拌装置１４の攪拌軸１２が、上記リーダ１１に沿って昇降自在な上部軸受１６に回転自在に支持されるとともに、その下部にブレ止めスペーサ１７を取り付けており、<ii>上記反応材注入手段１３が、下部を上記ブレ止めスペーサ１７に固定し、上部を上部軸受１６に上下摺動自在に支持させた注入ホース保護管１８に、反応材を注入ノズル２０へ送給する反応材注入ホース１９を挿通させてなる請求項４記載の地盤改良システムである。
In the present invention according to claim 5 , <i> the stirring shaft 12 of the injection stirring device 14 is rotatably supported by an upper bearing 16 which can be moved up and down along the leader 11, and a blur preventing spacer is provided below the shaft. <Ii> The reaction material injection means 13 reacts with an injection hose protective tube 18 whose lower part is fixed to the anti-blur spacer 17 and whose upper part is supported by the upper bearing 16 so as to be vertically slidable. The ground improvement system according to claim 4, wherein a reaction material injection hose 19 for feeding the material to the injection nozzle 20 is inserted.

請求項６記載の本発明は、上記反応材注入手段１３の注入ノズル２０が、注入管２０ｂの先端に可撓性を有する管状のノズルカバー２０ｃを嵌着してなる請求項４または５記載の地盤改良システムである。
According to a sixth aspect of the invention, the injection nozzle 20 of the reaction material injection means 13, and fitting the nozzle cover 20c of the tubular having the flexible tip of the injection tube 20b composed of claim 4 or 5, wherein It is a ground improvement system.

請求項１，５記載の本発明によれば、反応材注入ホースの座屈を防止できるので、その座屈により反応材の供給が断たれること防止できる。
According to the first and fifth aspects of the present invention, since the buckling of the reaction material injection hose can be prevented, the supply of the reaction material can be prevented from being cut off due to the buckling.

請求項２，３，６記載の本発明によれば、注入ノズルの土詰まりを防止できる。したがって、注入攪拌装置の貫入下降時に、土詰まりを防止するために水を噴射させる必要がなく、周辺地盤の泥濘化を生じさせない。
According to the present invention of claim 2, 3, 6, wherein, the soil clogging of the injection nozzle can be prevented. Therefore, it is not necessary to inject water in order to prevent clogging at the time of intrusion and descent of the injection stirrer, and the surrounding ground is not mudched.

請求項４，５，６記載の本発明によれば、粉体浄化材供給ラインが破損した際の粉体浄化材の飛散を防止するとともに、その破損をいち早くこれを検知することができる。 According to the fourth, fifth, and sixth aspects of the present invention, it is possible to prevent the powder purification material from being scattered when the powder purification material supply line is damaged, and to quickly detect the breakage.

ベースマシン１０’のリーダ１１に、撹拌軸１２と反応材注入手段１３とからなる注入攪拌装置１４を昇降自在に支持した地盤改良機１０の上記攪拌軸１２に接続された粉体浄化材供給ラインが、外側管２７，３２内に内側管２６，３０を配置した二重管構造をなし、その内管２６，３０内を、上記攪拌軸１２内部の浄化材送給路１２”へ粉体浄化材を供給する粉体浄化材供給路αとし、その外側に、上記攪拌軸１２側端部を閉塞した排出路βを形成し、かつ、その排出路βの排出口３２’を漏気検知槽３７内で水中に沈めてなる地盤改良システム。   A powder purification material supply line connected to the agitation shaft 12 of the ground improvement machine 10 in which an injection agitation device 14 comprising an agitation shaft 12 and a reaction material injection means 13 is supported on the leader 11 of the base machine 10 'so as to be movable up and down. However, the inner pipes 26 and 30 are arranged in the outer pipes 27 and 32 to form a double pipe structure, and the inner pipes 26 and 30 are powder-purified into the purification material supply path 12 ″ inside the stirring shaft 12. A powder purification material supply path α for supplying the material is formed, and a discharge path β is formed outside the end of the stirring shaft 12 side, and a discharge port 32 ′ of the discharge path β is an air leakage detection tank. 37 Ground improvement system that is submerged in water.

本発明の実施例に係る地盤改良システムについて図１〜７により詳しく説明する。   A ground improvement system according to an embodiment of the present invention will be described in detail with reference to FIGS.

１０は、クローラ式のベースマシン１０’に備えられた高さ２０ｍ程度のリーダ１１に、下端に攪拌翼１２’……を有する一対の攪拌軸１２，１２と反応材注入手段１３とからなる注入攪拌装置１４を昇降自在に支持させてなる地盤改良機である。   10 is an injection composed of a pair of stirring shafts 12 and 12 having a stirring blade 12 ′ at the lower end and a reactant injection means 13 on a leader 11 having a height of about 20 m provided in a crawler type base machine 10 ′. This is a ground improvement machine in which the stirring device 14 is supported so as to be movable up and down.

上記攪拌軸１２，１２は、その内部に上記攪拌翼１２’……の所要位置に開口した噴出孔１５に連通する浄化材送給路１２”を形成しているもので、それは、上記リーダ１１に沿って昇降自在にした上部軸受１６により、その上端部において回転自在に支持されているものである（図２）。   The agitation shafts 12 and 12 are formed therein with a purifier feed passage 12 ″ communicating with an ejection hole 15 opened at a required position of the agitation blades 12 ′... Is supported by the upper bearing 16 that can freely move up and down along the upper edge thereof (FIG. 2).

１７は、その攪拌軸１２，１２の下部に、攪拌翼１２’……の直上に位置させて、両攪拌軸１２，１２間に取り付けられているブレ止めスペーサで（図４，５）、それは、上記攪拌軸１２，１２を挿通させた筒状の攪拌軸挿通部１７ａ，１７ａの間に連結板１７ｂを固着してなる鋼製のものである。   17 is an anti-blur spacer that is positioned between the stirring shafts 12 and 12 at the lower part of the stirring shafts 12 and 12 and positioned between the stirring shafts 12 and 12 (FIGS. 4 and 5). The connecting plate 17b is fixed between the cylindrical stirring shaft insertion portions 17a and 17a through which the stirring shafts 12 and 12 are inserted.

上記反応材注入手段１３は、上記上部軸受１６と上記ブレ止めスペーサ１７とにその上下部を取り付けられ、上記攪拌軸１２，１２の間に位置する鋼製の注入ホース保護管１８内に、耐薬品性を有する反応材注入ホース１９を挿通するとともに、その反応材注入ホース１９の下端に、上記ブレ止めスペーサ１７の前面に固定された注入ノズル２０を接続してなるものである（図２〜４）。   The reaction material injection means 13 has upper and lower parts attached to the upper bearing 16 and the anti-blur spacer 17, and is resistant to the steel injection hose protective pipe 18 positioned between the stirring shafts 12, 12. The reaction material injection hose 19 having chemical properties is inserted, and the injection nozzle 20 fixed to the front surface of the anti-blur spacer 17 is connected to the lower end of the reaction material injection hose 19 (FIG. 2). 4).

上記注入ホース保護管１８の下部は、上記ブレ止めスペーサ１７の前面に固定金具２１により固定されているが、その上部は、上記上部軸受１６の前面に固定された、該注入ホース保護管１８よりも大径のガイド管２２に上下摺動自在に挿通して支えられている。
上記反応材注入ホース１９は、上記注入ホース保護管１８の上端より突出させた上端を、上記上部軸受１６に固定されたホースジョイント２３の下端に接続している。 The lower portion of the injection hose protection tube 18 is fixed to the front surface of the anti-blur spacer 17 by a fixing bracket 21, but the upper portion is from the injection hose protection tube 18 fixed to the front surface of the upper bearing 16. Is also supported by a large-diameter guide tube 22 that is slidably inserted vertically.
The reaction material injection hose 19 has an upper end protruding from the upper end of the injection hose protection tube 18 connected to the lower end of the hose joint 23 fixed to the upper bearing 16.

上記注入ノズル２０は、両端を閉じた中空筒状の分岐管２０ａの下側に、４本の注入管２０ｂ……を分岐接続している鋼製のもので、上記分岐管２０ａの供給口に上記反応材注入ホース１９の下端を接続している。
その各注入管２０ｂ……の先端には可撓性を有する管状のノズルカバー２０ｃ……を嵌着してある。このノズルカバー２０ｃ……はゴム管とすることができる。
よって、反応材注入ホース１９から送給される反応材は、各注入管２０ｂに取り付けたノズルカバー２０ｃから下方へ噴出するようになっている。 The injection nozzle 20 is made of steel in which four injection pipes 20b... Are branched and connected to the lower side of a hollow cylindrical branch pipe 20a closed at both ends, and is connected to the supply port of the branch pipe 20a. The lower end of the reaction material injection hose 19 is connected.
A flexible tubular nozzle cover 20c... Is fitted to the tip of each injection tube 20b. The nozzle cover 20c can be a rubber tube.
Therefore, the reaction material fed from the reaction material injection hose 19 is jetted downward from the nozzle cover 20c attached to each injection pipe 20b.

本地盤改良システムは、上記の地盤改良機１０に、粉体浄化材であるたとえば粒径１００μｍ程度の微細鉄粉を供給する粉体浄化材供給ラインと、リン酸と過酸化水素の混合液である反応材を供給する反応材供給ラインとを接続して構成されるので、続いて、その粉体浄化材供給ラインと反応材供給ラインについて説明する。   The ground improvement system includes a powder purification material supply line that supplies fine iron powder having a particle size of, for example, about 100 μm, and a mixed solution of phosphoric acid and hydrogen peroxide. Since a reaction material supply line for supplying a certain reaction material is connected, the powder purification material supply line and the reaction material supply line will be described.

２４，２４は、上記一対の攪拌軸１２，１２の上端のスイベル２５，２５にビクトリックジョイント２５’で固定された弧状のベント管である（図１，２，６）。
これは、上記攪拌軸１２の浄化材送給路１２”に連通するよう接続された、鋼製で内径５０ｍｍ程度の内管（内側管）２６の外側に、同じく鋼製で内径１２５ｍｍ程度の保護外管（外側管）２７を被覆し、二重管としたもので、その内管２６と保護外管２７との間には環状空処２８が形成されている。その環状空処２８の攪拌軸１２側の端部は閉塞してある。 Reference numerals 24 and 24 denote arc-shaped vent pipes fixed to the swivels 25 and 25 at the upper ends of the pair of agitation shafts 12 and 12 by a victic joint 25 '(FIGS. 1, 2 and 6).
This is a protection made of steel, which is connected to the purification material feed path 12 ″ of the agitation shaft 12 and which is connected to the outside of the inner tube (inner tube) 26 made of steel and having an inner diameter of about 50 mm. The outer tube (outer tube) 27 is coated to form a double tube, and an annular space 28 is formed between the inner tube 26 and the protective outer tube 27. Stirring of the annular space 28 The end on the shaft 12 side is closed.

上記ベント管２４，２４のスイベル２５，２５の反対側端には、同じく二重管構造をなし、上記ベント管２４，２４とともに粉体浄化材供給ラインをなす防護圧送ホース２９，２９（一方のみ図示した。）を接続している（図１，６，７）。
各防護圧送ホース２９は、上記内管２６にネジジョイントにより接続された、内径５０ｍｍ程度の肉厚合成樹脂製で螺旋状の鋼線を内包したサンドブラストホース等の耐摩耗性を有する内側ホース（内側管）３０を、上記保護外管２７にビクトリックジョイント３１により接続された、合成樹脂製波付き硬質可撓電線管（いわゆるエフレックス管）等の外側ホース（外側管）３２内に挿通してなる。
なお、その外側ホース３２は内側ホース３０よりも短く、該内側ホース３０のベント管接続端側の所要長さの部分にだけ被覆された状態となっている。 At the opposite ends of the swivels 25, 25 of the vent pipes 24, 24, a double-pipe structure is formed, and the protective pressure-feeding hoses 29, 29 (only one of them) forming a powder purification material supply line together with the vent pipes 24, 24. Are connected) (FIGS. 1, 6 and 7).
Each protective pumping hose 29 is connected to the inner pipe 26 by a screw joint, and is an inner hose (inner side) having a wear resistance such as a sandblast hose made of a thick synthetic resin having an inner diameter of about 50 mm and containing a helical steel wire. Tube) 30 is inserted into an outer hose (outer tube) 32 such as a synthetic resin corrugated rigid flexible electric wire tube (so-called Eflex tube) connected to the protective outer tube 27 by a victic joint 31. Become.
The outer hose 32 is shorter than the inner hose 30 and is covered only on the required length of the inner hose 30 on the vent pipe connection end side.

上記内側ホース３０およびこれと接続され連通するベント管２４の内管２６は、粉体浄化材供給路αをなしている。
また、上記内側ホース３０と外側ホース３２との間に形成された通路３３は、上記ベント管２４の環状空処２８に連通しこれとともに排出路βをなしている。
この排出路βは、閉塞されている上記環状空処２８のビクトリックジョイント２５’側奥部を始端とし、上記外側ホース３２の排出口３２’を終端としている。 The inner hose 30 and the inner pipe 26 of the vent pipe 24 connected to and in communication with the inner hose 30 constitute a powder purification material supply path α.
Further, a passage 33 formed between the inner hose 30 and the outer hose 32 communicates with the annular empty space 28 of the vent pipe 24 to form a discharge path β together with this.
The discharge path β starts from the closed portion of the closed annular cavity 28 on the side of the electric joint 25 ′ and ends at the discharge port 32 ′ of the outer hose 32.

また、上記外側ホース３２のベント管接続端側の所要長さの部分には、いわゆるサニーホース（フラットホース）が、注入攪拌装置１４の昇降に伴う擦れ防止のための保護被覆ホース３４として被覆されている（図１，６）。   In addition, a so-called sunny hose (flat hose) is covered as a protective covering hose 34 for preventing rubbing associated with the raising and lowering of the injection and agitation device 14 on the part of the required length on the vent pipe connecting end side of the outer hose 32. (Figs. 1 and 6).

上記粉体浄化材供給路α、すなわち内側ホース３０の上流側端は、上記地盤改良機１０に粉体浄化材を圧送する浄化材供給機３５に接続されており、上記粉体浄化材は該浄化材供給機３５からエアにより粉体浄化材供給路αから上記攪拌軸１２，１２の浄化材送給路１２”，１２”を通じて送給され、上記攪拌軸１２の噴出孔１５から噴出するようになっている。   The powder purification material supply path α, that is, the upstream end of the inner hose 30 is connected to a purification material supply machine 35 that pumps the powder purification material to the ground improvement machine 10, and the powder purification material is Air is supplied from the powder purification material supply path α through the purification material supply paths 12 ″ and 12 ″ of the agitation shafts 12 and 12 by the air from the purification material supply unit 35 and is ejected from the ejection holes 15 of the agitation shaft 12. It has become.

３６は、粉体浄化材供給ラインの途中に設けられた漏気検知部で、それは、水を張った漏気検知槽３７に、上記防護圧送ホース２９の途中部分を通し、かつ、上記排出路βの終端開口すなわち上記内側ホース３０に被覆している外側ホース３２の排出口３２’を、その漏気検知槽３７内で水中に沈めているものである。   36 is an air leakage detection part provided in the middle of the powder purification material supply line, and it passes the intermediate part of the protective pumping hose 29 through the air leakage detection tank 37 filled with water and the discharge passage. The end opening of β, that is, the discharge port 32 ′ of the outer hose 32 covering the inner hose 30 is submerged in the leak detection tank 37.

４０は、反応材収容槽４１，４２にそれぞれ収容されたリン酸と過酸化水素とを混合ミキサ４３で混合して調製され、反応材圧送ポンプ４４で上記地盤改良機１０へ反応材を送給するタイロンホース等の耐薬品性の反応材送給ホース（反応材供給ライン）である。
その反応材送給ホース４０の下流側端は上記地盤改良機Ａの上部軸受１６のホースジョイント２３の上端に接続され（図２，３）、上記反応材注入ホース１９に連通している。 40 is prepared by mixing phosphoric acid and hydrogen peroxide respectively stored in the reaction material storage tanks 41 and 42 by the mixing mixer 43, and supplying the reaction material to the ground improvement machine 10 by the reaction material pressure pump 44. It is a chemical-resistant reaction material supply hose (reaction material supply line) such as a Tyrone hose.
The downstream end of the reaction material supply hose 40 is connected to the upper end of the hose joint 23 of the upper bearing 16 of the ground improvement machine A (FIGS. 2 and 3) and communicates with the reaction material injection hose 19.

よって、上記反応材圧送ポンプ４４から圧送され、反応材送給ホース４０および反応材注入ホース１９を通じて送給される反応材は、上記注入ノズル２０の各注入管２０ｂ……を通じ、そこに嵌着されたノズルカバー２０ｃ……より噴出するようになっている。   Therefore, the reaction material pumped from the reaction material pump 44 and fed through the reaction material feed hose 40 and the reaction material injection hose 19 is fitted into the injection pipe 20b through the injection pipes 20b. The nozzle cover 20c...

上記地盤改良システムによる地盤改良工事は次のように行われる。   The ground improvement work by the above ground improvement system is performed as follows.

すなわち、上記地盤改良機１０を地盤改良を行おうとする箇所に位置させ、攪拌軸１２，１２を回転させながら上記注入攪拌装置１４を下降させてその攪拌翼１２’……を地中に貫入させる。
この注入攪拌装置１４の下降時には、可撓性を有する上記ノズルカバー２０ｃ……が屈曲するので、上記注入管２０ｂ……に土砂が詰まってしまうことがない。
したがって、従来行っていたように、注入ノズル２０の詰まり防止のために水を噴出させる必要がなく、周辺地盤を泥濘化することがない。 That is, the ground improvement machine 10 is positioned at a place where the ground improvement is to be made, and the stirring and stirring device 14 is lowered while rotating the stirring shafts 12 and 12 so that the stirring blades 12 '... Penetrate into the ground. .
When the pouring / stirring device 14 is lowered, the flexible nozzle cover 20c is bent, so that the pouring pipe 20b is not clogged with earth and sand.
Therefore, as conventionally performed, it is not necessary to eject water to prevent clogging of the injection nozzle 20, and the surrounding ground is not muddy.

上記攪拌翼１２’……を地中の所要深さまで貫入させた後、攪拌軸１２，１２を回転させ、かつ該注入攪拌装置１４全体を引き上げながら粉体浄化材および反応材を噴出させる。
すなわち、その引上げとともに、上記攪拌翼１２’……の噴出孔１５より、粉体浄化材を噴出させ、また同時に、上記注入ノズル２０を通じて反応材を噴出させる。
噴出した粉体浄化材と反応材とは、攪拌翼１２’……により土壌と攪拌されるので、土壌中の汚染物質を分解し浄化することができる。 After the agitating blades 12 'are penetrated to a required depth in the ground, the agitation shafts 12 and 12 are rotated, and the powder agitating material and the reaction material are ejected while pulling up the entire agitating and agitating device 14.
That is, with the pulling up, the powder purification material is ejected from the ejection holes 15 of the stirring blades 12 ′, and at the same time, the reaction material is ejected through the injection nozzle 20.
Since the ejected powder purification material and the reaction material are agitated with the soil by the agitating blades 12 '..., The contaminants in the soil can be decomposed and purified.

なお、注入攪拌装置１４の下降時に屈曲状態となっていた注入ノズル２０のノズルカバー２０ｃは、このときには、該注入攪拌装置１４自体の引上げにより下方に伸長した状態になるから、反応材の噴出を妨げることはない。   Note that the nozzle cover 20c of the injection nozzle 20 that was bent when the injection agitator 14 descended is now extended downward by pulling up the injection agitator 14 itself. There is no hindrance.

また、上記反応材注入ホース１９は、注入ホース保護管１８内に挿通されているから、注入攪拌装置１４の引上げの際に土砂との直接の摩擦がなく、従来のように座屈してしまうことがない。
上記注入ホース保護管１８は、土砂と直接摩擦を生じるが、該注入ホース保護管１８の上部は上記ガイド管２２に上下摺動自在に挿通されているから、無理な外力が加わった場合であっても、相対摺動が許容されるようになっているので、座屈してしまうことがない。 Moreover, since the said reaction material injection | pouring hose 19 is penetrated in the injection | pouring hose protection pipe 18, there is no direct friction with earth and sand at the time of pulling up of the injection | pouring stirring apparatus 14, and it will buckle like the past. There is no.
The injection hose protection pipe 18 directly causes friction with the earth and sand, but the upper part of the injection hose protection pipe 18 is inserted into the guide pipe 22 so as to be slidable up and down, so that an excessive external force is applied. However, since relative sliding is allowed, buckling does not occur.

上記の粉体浄化材の圧送により、上記内側ホース３０、内管２６の内面が摩耗するが、過度に摩耗して該内側ホース３０または内管２６が破損した場合であっても、その内部の粉体浄化材供給路αを圧送されてきた粉体浄化材およびエアは、その破損箇所から排出路β内に漏れるので、周囲に飛散しない。したがって周辺環境の悪化を防ぐことができる。
排出路βへ漏れた粉体浄化材およびエアは、該排出路βを通じて上記漏気検知槽３７の方へ流れ、該漏気検知槽３７内に張られた水の中に開口する上記外側ホース３２の排出口３２’から噴出する。
したがって、上記内側ホース３０または内管２６の破損は、この漏気検知槽３７内に張られた水に泡が発生することにより簡単に視認されるようになっており、また、粉体浄化材は周辺に飛散することなくその漏気検知槽３７内に沈殿する。 Although the inner surface of the inner hose 30 and the inner tube 26 is worn by the pressure feeding of the powder cleaning material, even if the inner hose 30 or the inner tube 26 is damaged due to excessive wear, Since the powder purification material and air that have been pressure-fed through the powder purification material supply path α leak into the discharge path β from the damaged portion, they do not scatter around. Therefore, deterioration of the surrounding environment can be prevented.
The powder purifying material and air leaking into the discharge path β flow toward the leak detection tank 37 through the discharge path β, and the outer hose opens into the water stretched in the leak detection tank 37. It ejects from 32 discharge ports 32 '.
Therefore, the breakage of the inner hose 30 or the inner pipe 26 can be easily recognized by the generation of bubbles in the water stretched in the air leakage detection tank 37, and the powder purification material Settles in the air leak detection tank 37 without splashing around.

本発明の一実施例に係る地盤改良システムの全体構成図である。1 is an overall configuration diagram of a ground improvement system according to an embodiment of the present invention. 上記システムで使用する地盤改良機の上部軸受付近の正面図である。It is a front view of the upper bearing vicinity of the ground improvement machine used with the said system. 図２の要部拡大図である。FIG. 3 is an enlarged view of a main part of FIG. 2. 同地盤改良機の攪拌軸の下端付近の正面図である。It is a front view near the lower end of the stirring shaft of the ground improvement machine. 図４の要部拡大図である。It is a principal part enlarged view of FIG. 鉄粉送給ラインの要部の拡大側面図である。It is an enlarged side view of the principal part of an iron powder feeding line. 漏気検知部の拡大側面図である。It is an enlarged side view of a leak detection part. 従来の地盤改良機の側面図である。It is a side view of the conventional ground improvement machine.

符号の説明Explanation of symbols

α 粉体浄化材排出路
β 排出路
１０ 地盤改良機
１０’ ベースマシン
１１ リーダ
１２ 攪拌軸
１２” 浄化材送給路
１３ 反応材注入手段
１４ 注入攪拌装置
１６ 上部軸受
１７ ブレ止めスペーサ
１８ 注入ホース保護管
１９ 反応材注入ホース
２０ 注入ノズル
２０ｂ 注入管
２０ｃ ノズルカバー
２２ ガイド管
２６，３０ 内側管
２７，３２ 外側管
２１’ 排出口
３７ 漏気検知槽 α powder purification material discharge path β discharge path 10 ground improvement machine 10 ′ base machine 11 reader 12 stirring shaft 12 ”purification material supply path 13 reactive material injection means 14 injection stirring device 16 upper bearing 17 anti-blur spacer 18 injection hose protection Pipe 19 Reactant injection hose 20 Injection nozzle 20b Injection pipe 20c Nozzle cover 22 Guide pipe 26, 30 Inner pipe 27, 32 Outer pipe 21 'Discharge port 37 Leak detection tank

Claims (6)

ベースマシン（１０’）のリーダ（１１）に、撹拌軸（１２）と反応材注入手段（１３）とを備えた注入攪拌装置（１４）を昇降自在に支持してなる地盤改良機において、
<i> 上記注入攪拌装置（１４）の攪拌軸（１２）が、上記リーダ（１１）に沿って昇降自在な上部軸受（１６）に回転自在に支持されるとともに、その下部にブレ止めスペーサ（１７）を取り付けていると共に、
<ii> 上記反応材注入手段（１３）が、下部を上記ブレ止めスペーサ（１７）に固定し、上部を上部軸受（１６）に上下摺動自在に支持させた注入ホース保護管（１８）に、反応材を注入ノズル（２０）へ送給する反応材注入ホース（１９）を挿通させて構成され、
<iii> 上記反応材注入ホース（１９）が耐薬品性を有し、上記注入ホース保護管（１８）が鋼製である一方、
<iv> 上記注入ホース保護管（１８）の上部は、該注入ホース保護管（１８）より大径のガイド管に上下摺動自在に挿通されて前記上部軸受（１６）に支持されている
ことを特徴とする地盤改良機。 In the ground improvement machine which supports the injection | pouring stirring apparatus (14) provided with the stirring shaft (12) and the reaction material injection | pouring means (13) to the reader | leader (11) of a base machine (10 ') so that raising / lowering is possible,
<i> The stirring shaft (12) of the injection stirring device (14) is rotatably supported by an upper bearing (16) that can be moved up and down along the leader (11), and an anti-blur spacer ( together have installed a 17),
<ii> The reaction material injection means (13) is fixed to the injection hose protective pipe (18) whose lower part is fixed to the anti-blur spacer (17) and whose upper part is supported by the upper bearing (16) so as to slide up and down The reaction material injection hose (19) for feeding the reaction material to the injection nozzle (20) is inserted ,
<iii> While the reaction material injection hose (19) has chemical resistance and the injection hose protective tube (18) is made of steel,
<iv> The upper portion of the injection hose protection pipe (18) is inserted into a guide pipe having a larger diameter than the injection hose protection pipe (18) so as to be vertically slidable and supported by the upper bearing (16). A ground improvement machine characterized by 上記反応材注入手段（１３）の注入ノズル（２０）の注入管（２０ｂ）の先端に、可撓性を有する管状のノズルカバー（２０ｃ）を嵌着してなることを特徴とする請求項１記載の地盤改良機。 The flexible tubular nozzle cover (20c) is fitted to the tip of the injection tube (20b) of the injection nozzle (20) of the reaction material injection means (13). The ground improvement machine described. 上記注入ノズル（２０）が、分岐管（２０ａ）に、可撓性を有する管状のノズルカバー（２０ｃ）を嵌着した複数本の注入管（２０ｂ……）を分岐接続してなることを特徴とする請求項２記載の地盤改良機。 The injection nozzle (20) is formed by branching and connecting a plurality of injection pipes (20b...) Having a flexible tubular nozzle cover (20c) fitted to the branch pipe (20a). The ground improvement machine of Claim 2 . ベースマシン（１０’）のリーダ（１１）に、撹拌軸（１２）と反応材注入手段（１３）とを備えた注入攪拌装置（１４）を昇降自在に支持した地盤改良機（１０）の上記攪拌軸（１２）に接続された粉体浄化材供給ラインが、外側管（２７，３２）内に内側管（２６，３０）を挿通した二重管構造をなし、その内管（２６，３０）内を、上記攪拌軸（１２）内部の浄化材送給路（１２”）へ粉体浄化材を供給する粉体浄化材供給路（α）とし、その外側に、上記攪拌軸（１２）側端部を閉塞した排出路（β）を形成していること、および上記粉体浄化材送給ラインの途中部分を漏気検知槽（３７）に通し、上記排出路（β）の排出口（３２’）を該漏気検知槽（３７）内で水中に沈めていることを特徴とする地盤改良システム。   The above-mentioned ground improvement machine (10) in which the leader (11) of the base machine (10 ') is supported by an injection stirring device (14) having a stirring shaft (12) and a reaction material injection means (13) so as to be movable up and down. The powder purification material supply line connected to the stirring shaft (12) has a double tube structure in which the inner tube (26, 30) is inserted into the outer tube (27, 32), and the inner tube (26, 30). ) Is a powder purification material supply path (α) for supplying the powder purification material to the purification material supply path (12 ″) inside the stirring shaft (12), and the stirring shaft (12) is disposed outside the powder purification material supply path (α). A discharge passage (β) whose side end is closed is formed, and an intermediate portion of the powder purification material feed line is passed through an air leakage detection tank (37), and a discharge port of the discharge passage (β) A ground improvement system characterized in that (32 ') is submerged in water in the leak detection tank (37). <i>上記注入攪拌装置（１４）の攪拌軸（１２）が、上記リーダ（１１）に沿って昇降自在な上部軸受（１６）に回転自在に支持されるとともに、その下部にブレ止めスペーサ（１７）を取り付けていること、および、
<ii>上記反応材注入手段（１３）が、下部を上記ブレ止めスペーサ（１７）に固定し、上部を上部軸受（１６）に上下摺動自在に支持させた注入ホース保護管（１８）に、反応材を注入ノズル（２０）へ送給する反応材注入ホース（１９）を挿通させてなることを特徴とする請求項４記載の地盤改良システム。 <i> The stirring shaft (12) of the injection stirring device (14) is rotatably supported by an upper bearing (16) that can be moved up and down along the reader (11), and an anti-blur spacer ( 17), and
<ii> The reaction material injection means (13) is fixed to the injection hose protective pipe (18) whose lower part is fixed to the anti-blur spacer (17) and whose upper part is supported by the upper bearing (16) so as to slide up and down. The ground improvement system according to claim 4, wherein a reaction material injection hose (19) for feeding the reaction material to the injection nozzle (20) is inserted. 上記反応材注入手段（１３）の注入ノズル（２０）が、注入管（２０ｂ）の先端に可撓性を有する管状のノズルカバー（２０ｃ）を嵌着してなることを特徴とする請求項４または５記載の地盤改良システム。
Claim the injection nozzle of the reaction material injection means (13) (20), characterized by comprising injection tube a tubular nozzle cover having a flexible tip of (20b) (20c) and fitted 4 Or the ground improvement system of 5 .
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