JPS61162625A - Improving material feed control device for ground improving machine - Google Patents

Abstract

PURPOSE:To cause an improving material to be fed with a pressure in an optimum manner even if a penetration depth is changed, by a method wherein an air flow rate detector and an air flow rate regulator are located in a compressed air feed line adapted to feed the improving material with a pressure, and based on a value detected by the detector, the regulator is controlled. CONSTITUTION:After an agitating vane 9 is penetrated into a soft ground A down to a given depth H, a main air is fed in a tank 10 through a main line 22, and an on-off valve valve 13 at an outlet 12 is opened. An improving material in the tank 10 is fed to a line 14 with the aid of a feeding device 11, and the improving agent is poured into the soft ground A through a discharge port 8 of an agitating shaft 6 togetherwith a main air fed in through the main line 22. In which case, an amount of the air fed is detected by a flow rate oscillator 23, the detecting value is compared with a set value by a controller 25, and based on the result, the opening and closing amount of a flow rate regulator 24 is controlled, and the improving material is always poured at an optimum value.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、陸上や海底等の軟弱地盤を改良する地盤改良
機における改良材供給制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement material supply control device for a ground improvement machine that improves soft ground on land or under the sea.

（従来技術） この種の地盤改良工法として、中空撹拌軸の先端に設け
た撹拌翼を回転させながら、軟弱地盤中に所定の深度ま
で貫入させた摂、該撹拌翼を回転させながら引抜き、そ
の４大または引抜きのいずれか一方の工程で、乾燥した
セメントや生石灰等の粉粒状の改良材を改良材供給タン
クから改良材供給管路を経て上２撹拌軸内に設けた改良
材供給通路に空気圧送して、該撹拌軸先端に設けた吐出
口から撹拌翼による撹拌域に吐出させ、その吐出された
改良材と軟弱地盤中の土壌とを撹拌翼により攪拌、温合
して地盤改良する地盤改良工法（１〕ＪＭ工法）が知ら
れている。(Prior art) As this type of ground improvement method, a stirring blade installed at the tip of a hollow stirring shaft is penetrated into soft ground to a predetermined depth while rotating, and the stirring blade is pulled out while rotating. In either of the 4 major or drawing processes, powdered improving materials such as dried cement or quicklime are passed from the improving material supply tank to the improving material supply passage provided in the upper 2 stirring shafts via the improving material supply pipe. Pneumatically pumped material is discharged from the discharge port provided at the tip of the stirring shaft into the stirring area by the stirring blade, and the discharged improvement material and the soil in the soft ground are stirred and warmed by the stirring blade to improve the ground. A ground improvement method (1) JM method is known.

この工法では、軟弱地盤中への改良材の供給は圧縮空気
による圧送としているが、ＩＩ拝輪軸先端吐出口が軟弱
地盤中に貫入されると、そのｎ大深度によって上記吐出
口にかかる土庄や水圧が苔しく変動し、この変動によっ
て改良材の軟弱地盤に対する吐出量が変動し、改良柱体
の品質が不均一になり易い。In this construction method, the improvement material is supplied into the soft ground by pressure-feeding using compressed air. However, when the II-shaft tip discharge port penetrates into the soft ground, the large depth of the discharge port causes the soil shoals and The water pressure fluctuates rapidly, and this fluctuation causes the amount of improvement material delivered to the soft ground to fluctuate, which tends to result in uneven quality of the improved column.

そこで、従来、上記土圧や水圧の変動に応じて改良材圧
送のための空気圧力を調「する方法が提案されているが
、この圧力調節では、改良材供給管路が長いため、圧迫
が大きく、改良材の吐出量を正確に調節することは困難
である。また、たとえ空気圧力を調節したとしても上記
土Ｉモや水圧の変動によって空気ＦＲｆｆｉが変動し、
上記改良材の吐出量が変動することになり、改良柱体の
品質に大きな影響を及ぼすことになる。Therefore, a method has been proposed in the past that adjusts the air pressure for pressure-feeding the improvement material according to the above-mentioned fluctuations in earth pressure and water pressure. Therefore, it is difficult to accurately adjust the discharge amount of improving material.Also, even if the air pressure is adjusted, the air FRffi will fluctuate due to fluctuations in the soil and water pressure.
The amount of the improvement material discharged will vary, which will have a large effect on the quality of the improved column.

ずなわら、空気流量が多すぎると、 ■　改良材が飛び過ぎていわゆるドーナツ現象が生じ、
中心部が改良されない場合があり、また、改良されてい
る部分についても不均一なばらつきが生じ易い。However, if the air flow rate is too high, ■ the improved material will fly too far and a so-called donut phenomenon will occur.
The central portion may not be improved, and even the improved portion is likely to have non-uniform variations.

■　軟弱地盤中で改良材から分離した用済み後の空気の
回収時に、人足の空気が、多量の水分を含んだ軟弱地盤
中の撹拌軸周囲に沿って地上等に回収されるため、陸上
においては液状化した軟弱土を飛散させる噴泥現象が生
じ、施工環境を８しく悪化さけ、また、海上においては
、ニアリフ１へ現象により海底の泥土が海水中に多ζ０
に放出されて、海水を茗しく汚染する。■ When collecting spent air separated from improved materials in soft ground, the air from human feet is collected on the ground etc. along the stirring shaft in soft ground containing a large amount of moisture. At sea, a mud blowing phenomenon occurs that scatters liquefied soft soil, worsening the construction environment considerably.In addition, at sea, near rift 1 causes mud on the seabed to dissipate into the seawater.
is released into the sea, contaminating the seawater.

■　人足の空気がｔ＋’４９され、空気圧縮機の動力消
費借も大きく、エネルギーロスが大きい。■ The amount of air consumed by human feet is t+'49, and the power consumption of the air compressor is also large, resulting in a large amount of energy loss.

等のｌ？ｇ題があり、また空気流量が少なすぎると、■
　土圧や水圧の急激な変化やホースの些細な変化（たと
えば折れ曲り）でも、改良材が吐出できなくなったり、
詰ったりするおそれがあり、施工能率が大幅に低下する
。etc. l? If there is a problem and the air flow rate is too low, ■
Sudden changes in soil pressure or water pressure, or even small changes in the hose (for example, bending) can cause the improvement material to become unable to be discharged.
There is a risk of clogging, which will significantly reduce construction efficiency.

■　改良柱体の直径が目標値より小さくなるおそれがあ
る。■ The diameter of the improved column may be smaller than the target value.

なお、従来では、上記空気流量の調節をオペレータが手
動により行っており、この場合、上記空気流量が多くな
ったり、少なくなったりの変動はランダムに発生するた
め、手動では正確な調節が極めて困ｎであり、改良材を
精度よく均一に圧送することができず、良品質の改良柱
体を（することは難しい。また、手動ではオペレータに
よって空気流量の調１ｉ１ｆｆｉが異なり、改良地盤の
品質に差が生じ、オペレータの精神的疲労も大きい等の
問題があった。Conventionally, the air flow rate has been manually adjusted by the operator, and in this case, the air flow rate increases or decreases randomly, making it extremely difficult to make accurate adjustments manually. Therefore, it is difficult to force-feed the improvement material uniformly with high precision, and it is difficult to create a good quality improvement column.In addition, when using manual operation, the air flow rate varies depending on the operator, which may affect the quality of the improved ground. There were problems such as a difference in operation and the mental fatigue of the operator.

（発明の目的） 本発明は、このような問題を解決するためになされたも
のであり、質入深度や水深が変っても、また、土圧ヤ水
圧の変動があっても、改良材圧送のための空気流量を適
正かつ迅速にｗ１４ｍしｍて、改良材の吐出口からの吐
出量を自助的に適正に制御でき、自動化、省力化を図る
とともに、圧縮空気および改良材の無駄な消費をなくし
、省エネルギー効果を高め、かつ、良質の地盤改良を行
わせることができる装置を提供するものである。(Purpose of the Invention) The present invention was made to solve such problems, and even if the pawning depth or water depth changes, or even if there are fluctuations in earth pressure or water pressure, the improved material can be pumped. By adjusting the air flow rate properly and quickly, the amount of improved material discharged from the outlet can be properly controlled on your own, achieving automation and labor savings, as well as eliminating wasted consumption of compressed air and improved material. The purpose of the present invention is to provide a device that can eliminate the problem, increase the energy saving effect, and perform high-quality ground improvement.

（発明の構成） 本発明は、先端に撹拌翼を有する撹拌軸を回転ならびに
昇降自在に装備し、かつ、上記撹拌翼による撹拌域に改
良材を吐出する吐出口を偏えた地盤改良機と、改良材送
出装置を備えた改良材供給タンクと、該タンクから送出
された改良材を地盤改良機の吐出口に空気圧送する改良
材供給管路と、その空気圧送のための圧縮空気を供給す
る圧縮空気供給管路と、圧縮空気供給管路の途中に設け
られた空気流母検出器および空気流１：ｇ１節器とを具
備し、かつ、上記検出器による空気流母枝出値に基いて
上記調節器を作動して上記圧縮空気の供給流りを１ｌＪ
Ｉｌする制御手段を設けてなることを特徴とするもので
ある。(Structure of the Invention) The present invention provides a ground improvement machine equipped with a stirring shaft having a stirring blade at the tip so as to be rotatable and movable up and down, and having a discharge port which discharges improving material into a stirring area by the stirring blade, An improvement material supply tank equipped with an improvement material delivery device, an improvement material supply pipe that pneumatically delivers the improvement material sent out from the tank to the discharge port of the soil improvement machine, and supplies compressed air for the pneumatic delivery. It is equipped with a compressed air supply pipe, an air flow base detector and an air flow 1:g1 node provided in the middle of the compressed air supply pipe, and is equipped with an air flow base output value based on the air flow base output value by the detector. and actuate the regulator to reduce the compressed air supply flow to 1 lJ.
The present invention is characterized in that it is provided with a control means for controlling Il.

（実施例） 図において、地盤改良ｖＡ１は、ベースマシン２に立設
されたリーダ３に回転駆動装置４および沖降駆動装胃５
を介して中空撹拌軸６が回転ならびに昇降自在に支持さ
れてなるものであり、中空撹拌軸６は内部に改良材供給
通路７を有し、下端に吐出口８ｊ５よび攪拝買９が設け
られている。(Example) In the figure, soil improvement vA1 includes a rotary drive device 4 and an off-shore drive mechanism 5 on a leader 3 installed upright on a base machine 2.
A hollow stirring shaft 6 is supported so as to rotate and move up and down, and the hollow stirring shaft 6 has an improvement material supply passage 7 inside, and a discharge port 8j5 and a stirring shaft 9 are provided at the lower end. ing.

改良材供給タンク１０は、下部に改良材送出装置１１を
具備し、その改良材送出口１２に開閉弁１３を介してホ
ース等の改良材供給管路１４が接続され、この管路１４
がスイベルジヨイント等を介して上記撹拌軸６の上端に
接続されている。上記改良材送出装置１１には、上面周
辺部に一定ピッチで多数の送出用凹部を備えたフィード
ホイルが用いられる。また、改良材送出１調節器として
、この改良材吐出中Ｗ：１１１の駆動モータ１５の回転
量をｔＩＩＩｒＩｇづるｉｌＪ御器１６が設けられてい
る。上記開閉弁１３にはピンチ弁が用いられ、この弁１
３に開開ｖ制御管路１７が接続され、その管路１７がク
イックエキゾーストパルプ１８および［１弁１９を介し
てエアレシーバタンク２０に接続され、該タンク２０が
圧縮空気源２１に接続されている。The improvement material supply tank 10 is equipped with an improvement material delivery device 11 at the bottom, and an improvement material supply pipe 14 such as a hose is connected to the improvement material delivery port 12 via an on-off valve 13.
is connected to the upper end of the stirring shaft 6 via a swivel joint or the like. The improvement material delivery device 11 uses a feed foil having a large number of delivery recesses at a constant pitch around the upper surface. Further, as an improved material delivery 1 regulator, an ilJ controller 16 is provided which adjusts the amount of rotation of the drive motor 15 during the improved material delivery W: 111 by tIIIrIg. A pinch valve is used as the on-off valve 13, and this valve 1
3 is connected to an opening/opening control line 17, which line 17 is connected to an air receiver tank 20 via a quick exhaust pulp 18 and a [1 valve 19, and the tank 20 is connected to a compressed air source 21. There is.

上記バルブ１８はその一次側の制−圧力がなくなったと
きに二次側（ピンチ弁側）にある圧縮空気を即座に大気
に放出し、ピンチ弁の応答速度を早めるためのものであ
る。The valve 18 is intended to immediately release compressed air on the secondary side (pinch valve side) to the atmosphere when the suppressing pressure on the primary side is exhausted, thereby speeding up the response speed of the pinch valve.

一方、改良材供給タンク１０および改良材供給管路１４
に対し、改良材の空気圧送のために、改良材送出装置１
１の一側部にメイン管路２２が接続され、かつ、上記改
良材供給管路１４の上流でｒＭ閉弁１３の近くにバイパ
ス管路２８が接続されている。メイン管路２２とバイパ
ス管路２８はそれぞれメインｉｎ調節弁２４とバイパス
流ｆ［節介３０を介してエアレシーバタンク２０に接続
され、各流９１４節弁２４．３０はその下流側（上流側
でもよい）に設けられた流偵発信″！２３．２９からの
流儀検出信号と制御器２５．３１に設定された設定値に
基いてその同閉山が調節される。なお、ｔＩＩ制御１５
２５．３１にはそれぞれ予めＡＩ！！質調査等によって
求められたデータに基いて、軟弱地盤Ａの深度および軟
弱度等に対応したメイン空気の必要流量およびバイパス
空気の必要流量が設定されている。２６．３２は各１４
節弁２４．３０に駆動圧を導くための減圧弁である。２
７．３３は圧力発信器で、各管路２２．２８の空気圧力
を検出して図外の圧力計に送りその圧力を表ホさせるも
のである。３４は改良材吐出中にバイパス管路２８が詰
ることを防止するために設けられた閉塞防止弁である。On the other hand, the improvement material supply tank 10 and the improvement material supply pipe line 14
On the other hand, in order to pneumatically feed the improved material, improved material delivery device 1 is used.
A main pipe line 22 is connected to one side of the main pipe 1, and a bypass pipe line 28 is connected upstream of the improvement material supply pipe line 14 and near the rM closing valve 13. The main conduit 22 and the bypass conduit 28 are connected to the air receiver tank 20 via the main in control valve 24 and the bypass flow f [node 30, respectively, and each flow 914 nodal valve 24.30 is connected to the air receiver tank 20 on the downstream side (upstream side) The closing of the mine is adjusted based on the style detection signal from the style transmission "!23.29 provided in the tII control 15.29 and the set value set in the controller 25.31.
AI in advance on 25.31! ! The required flow rate of main air and the required flow rate of bypass air are set in accordance with the depth and degree of soft ground A, etc., based on data obtained through quality surveys and the like. 26.32 is 14 each
This is a pressure reducing valve for guiding driving pressure to the control valves 24 and 30. 2
7.33 is a pressure transmitter that detects the air pressure in each pipe line 22.28, sends it to a pressure gauge (not shown), and displays the pressure. Reference numeral 34 denotes an anti-occlusion valve provided to prevent the bypass pipe line 28 from clogging during discharge of the improvement material.

なお、上記タンク１０の上部には改良材投入口３５と、
排気口３６が設けられ、投入口３５にはエアシリンダ３
８によって開閉される開閉弁３７が設けられ、排気口３
６にはピンチ弁３９が設けられている。４０．４１はス
ローリターンチェック弁、４２は電磁弁、４３はクイッ
クエキゾーストバルブ、４４は電磁弁である。上記各電
磁弁１９．３４．４２．４４には図外の操作盤に設けら
れたスイッチにより開閉される。In addition, at the upper part of the tank 10, there is an improvement material input port 35,
An exhaust port 36 is provided, and an air cylinder 3 is provided at the input port 35.
An on-off valve 37 that is opened and closed by the exhaust port 3 is provided.
6 is provided with a pinch valve 39. 40. 41 is a slow return check valve, 42 is a solenoid valve, 43 is a quick exhaust valve, and 44 is a solenoid valve. Each of the electromagnetic valves 19, 34, 42, and 44 is opened and closed by a switch provided on an operation panel (not shown).

次に、上記装置の作動について説明する。Next, the operation of the above device will be explained.

まず、地盤改良ｔ１１ｆｌｌにおいて、回転駆動装η４
により撹拌軸６が回転されながら昇降ＪｉＩｉ！動装置
５により下降され、ｍ拌岡９が軟弱１１１！ＩＩＡ中に
所定の深度Ｈまでｎ人される。このとき、改良材供給タ
ンク１０側において、′Ｒ磁弁１９が図示の位置に保持
され、開閉弁１３が閏じられた状態で、バイパス管路２
８の流■調節弁３０が開かれ、圧縮空気が圧縮空気源２
１、エアレシーバタンク２Ｑからバイパス管路２８、改
良材供給管路１４を経て撹拌軸６内の改良材供給通路７
に送給され、該空気がＰ！ｉ痒軸６の先端吐出口８から
吐出され、土庄または水圧によって該吐出口８から撹拌
軸６内にヘドロ等が侵入することが防止される。First, in the ground improvement t11flll, the rotary drive device η4
JiIi! moves up and down while the stirring shaft 6 is rotated by JiIi! It is lowered by the moving device 5, and the m stirring oka 9 is soft 111! During IIA, n people are added to a predetermined depth H. At this time, on the improvement material supply tank 10 side, the 'R solenoid valve 19 is held at the illustrated position, the on-off valve 13 is opened, and the bypass pipe 2 is opened.
Flow of 8■ The control valve 30 is opened and the compressed air is supplied to the compressed air source 2.
1. From the air receiver tank 2Q through the bypass pipe 28 and the improving material supply pipe 14 to the improving material supply passage 7 in the stirring shaft 6
The air is supplied to P! It is discharged from the distal end discharge port 8 of the itching shaft 6, and sludge or the like is prevented from entering the stirring shaft 6 from the discharge port 8 by the soil or water pressure.

この空気の吐出時において、バイパス管路２８の！ｆｆ
ｉ発信器２９によりバイパス空気流山のプロセス遣が検
出され、そのプロセス伍と［１１１３３１に設定された
設定値に基いて流量ｇＩｉ弁３０の開閉量がｉｑＷされ
、バイパス管路２８から改良材供給管路１４に送られる
バイパス空気の供給流量が自動的に制御される。これに
よって、撹拌軸６の買入深度や土圧等が変っても上記吐
出口８から撹拌軸６内へのヘドロ等の侵入が確実に防止
される。When this air is discharged, the bypass pipe line 28! ff
The process flow of the bypass air flow mountain is detected by the i transmitter 29, and the opening/closing amount of the flow rate gIi valve 30 is set iqW based on the process status and the set value set in [111331, and the improvement material supply pipe is The supply flow rate of bypass air sent to line 14 is automatically controlled. This reliably prevents sludge and the like from entering into the stirring shaft 6 from the discharge port 8 even if the purchase depth of the stirring shaft 6, soil pressure, etc. change.

一方、上記攪拌１９が軟弱地盤へに対して所定の深度Ｈ
まで貫入される前に、改良材供給タンク１０に改良材が
補給される。このとき、まず、排気弁４４が図面上位置
に切替えられて排気口３６の開閉弁３９が開かれ、タン
ク１０内の圧力が大気圧まで戻された侵、［１弁４２が
Ｉ、Ｉ］替えられ、エアシリンダ３８が作動されて投入
口３５のＧｉｌ　ｆｉｌ弁３７が開かれる。そして、サ
イロ、パケットコンベア、スクリュフィーダ等を装備し
た改良材供給プラント（図示省略）から投入口３５を経
て改良材供給タンク１０内に所定聞の改良材が補給され
る。なお、この補給時には、メイン管路２２の流憑調節
弁２４、改良材吐出口１２の開閉片１３は閉じられ、か
つ、改良材送出装置１１のモータ１５も停止されている
。On the other hand, the stirring 19 is applied to the soft ground at a predetermined depth H.
The improvement material is supplied to the improvement material supply tank 10 before the penetration of the improvement material. At this time, first, the exhaust valve 44 is switched to the position shown in the drawing, the on-off valve 39 of the exhaust port 36 is opened, and the pressure inside the tank 10 is returned to atmospheric pressure. The air cylinder 38 is operated to open the Gil fil valve 37 of the inlet 35. Then, a predetermined amount of improved material is supplied into the improved material supply tank 10 through the input port 35 from an improved material supply plant (not shown) equipped with a silo, a packet conveyor, a screw feeder, etc. At the time of this replenishment, the flow control valve 24 of the main conduit 22 and the opening/closing piece 13 of the improvement material discharge port 12 are closed, and the motor 15 of the improvement material delivery device 11 is also stopped.

上記改良材供給タンク１０に所定量の改良材が供給され
ると、電磁弁４２が図示の位置に戻され、エアシリンダ
３８が作動されて投入口３５の圓ｍ弁３７が閉じられる
とともに、′Ｒ１１弁４４が図示の位置に戻されて排気
口３６の開ｍ弁３９が閉じられ、次いで、メイン管路２
２の流ｆｆｉ調節弁２４が同かれ、圧縮空気Ｈ２１、エ
アレシーバタンク２０からメイン管路２２を経て改良材
供給タンク１０内に圧縮空気が供給され、該タンク１０
内が予め所定の圧力まで加圧され、タンク１０から撹拌
軸６への改良材の供給準備が完了され、待機している。When a predetermined amount of the improvement material is supplied to the improvement material supply tank 10, the solenoid valve 42 is returned to the position shown, the air cylinder 38 is activated, and the round valve 37 of the input port 35 is closed. The R11 valve 44 is returned to the illustrated position, the opening m valve 39 of the exhaust port 36 is closed, and then the main pipe 2
The second flow ffi control valve 24 is connected to the compressed air H21, and compressed air is supplied from the air receiver tank 20 to the improvement material supply tank 10 through the main pipe line 22.
The interior is pressurized to a predetermined pressure in advance, and preparations for supplying the improvement material from the tank 10 to the stirring shaft 6 are completed and are on standby.

而して、上記Ｉｊ！拌翼６が所定の深度Ｈまで貫入（η
底）されると、その昇降駆ｗＪ装″ｉＷ５が停止され、
メイン回路２２のＦＩＬｆｌＷ１節弁２４が開節介、メ
イン管路２２からタンク１０内にメイン空気が送込まれ
るとともに、送出口１２の開閉片１３が開かれ、かつ、
バイパス管路２８の滝ＩｒＡ節介３０がｍじられ、タン
ク１０内の改良材が改良材送出装置１１によって改良材
供給＠路１４に送出されるとともに、メイン管路２２か
ら送込まれるメイン空気によって改良材供給管！２１１
４からスイベルシミインドを経て）！拌軸６内の改良材
供給通路７に空気圧送され、撹拌軸６の先端吐出口８か
ら軟弱地盤Ａ中に１袂的に吐出され、この状態で、撹拌
ＩＩ９が回転されながら軟弱地盤Ａ中から徐々に引抜か
れ、この引抜き工程で、上記改良材と軟弱地ｇＩ八とが
攪拌、混合され、地盤改良が行われる。Then, the above Ij! The stirring blade 6 penetrates to a predetermined depth H (η
(bottom), the elevating drive wJ device "iW5" is stopped,
The FILflW1 control valve 24 of the main circuit 22 is opened, main air is sent from the main pipe line 22 into the tank 10, and the opening/closing piece 13 of the outlet 12 is opened, and
The waterfall IrA joint 30 of the bypass pipe line 28 is removed, and the improved material in the tank 10 is delivered to the improved material supply @ line 14 by the improved material delivery device 11, and the main air sent from the main pipe line 22 Improved material supply pipe by! 211
4 through Swivel Shimi India)! Air is fed into the improving material supply passage 7 in the stirring shaft 6, and is discharged from the distal end outlet 8 of the stirring shaft 6 into the soft ground A. In this state, while the stirring II 9 is being rotated, the material is fed into the soft ground A. In this drawing process, the above-mentioned improvement material and soft soil gI8 are stirred and mixed to improve the ground.

この改良材の吐出時において、メイン管路２２からタン
ク１０に供給されるメイン空気の供給流量のプロセスｍ
がＦＩＬｇｉ発信器２３により検出され、その検出信号
が制御器２５に送られ、該制御器２５に設定された設定
値と比較され、その結果に基いて流ｆｆｉ調節弁２４の
開ｒＩ４但が制御され、メイン管路２２からタンク１０
を経て改良材供給管路１４に送られる改良材送給のため
のメイン空気の流量が常に適正にｔｓｍａれる。これに
より、改良材が飛び過ぎてドーナツ現象が生じたり、改
良材の拡散効率が低下して改良柱体の直径が小さくなり
過ぎたりすることなく、改良材が常に適正に吐出されて
良質な地盤改良が行われる。At the time of discharge of this improved material, the process m of the supply flow rate of main air supplied from the main pipe line 22 to the tank 10
is detected by the FILgi transmitter 23, the detection signal is sent to the controller 25, and compared with the set value set in the controller 25, and based on the result, the opening rI4 of the flow ffi control valve 24 is controlled. from the main pipe 22 to the tank 10
The flow rate of the main air for feeding the improving material, which is sent to the improving material supply pipe 14 through the above, is always properly tsma. This prevents the improvement material from flying too far, causing a donut phenomenon, or reducing the diffusion efficiency of the improvement material and making the diameter of the improvement column too small. This ensures that the improvement material is always properly discharged, resulting in good quality soil. Improvements will be made.

なお、上記実施例において、改良材の吐出前に、予めタ
ンク１０内の圧力（−大圧力）を吐出口８側の土庄等（
二次圧力）に対応する圧力に加圧し、かつ、改良材送出
装置１６を設定値まで回転加速しておけば、改良材がそ
の吐出初期から上記吐出口８側の圧力に影響されること
なく、安定した状態で吐出が開始される。In the above embodiment, before discharging the improved material, the pressure in the tank 10 (-large pressure) was adjusted to
By pressurizing the improved material to a pressure corresponding to the secondary pressure (secondary pressure) and accelerating the rotation of the improved material delivery device 16 to the set value, the improved material will not be affected by the pressure on the discharge port 8 side from the initial stage of discharge. , discharge starts in a stable state.

また、上記メイン空気の供給流量のｔｌｌｔｉと併行し
て、制９１１２１１６により、改良材送重装ｆＦＪ１１
の駆動モータ１５の回転量を軟弱ｉＩ！ｌ盤Ａの深度お
よび軟弱度等に応じて１１１１１１し、タンク１０から
上記管路１４に対する改良材の送出はをｉｑｗすること
により、−ｍ効果的に地盤改良を行わせることができる
。In addition, in parallel with the tllti of the main air supply flow rate mentioned above, by control 9112116, the improved material heavy feeding equipment fFJ11
The rotation amount of the drive motor 15 is soft iI! By adjusting the flow rate of the improvement material from the tank 10 to the pipe line 14 according to the depth and softness of the board A, it is possible to effectively improve the ground.

また、本発明の装置は、引扱き工程で改良材を吐出する
場合だけに限らず、貫入工程で改良材を吐出する場合に
も用いることができ、がっ、陸上機に限らず、海底の軟
弱地盤の改良用としても用い得ることはいうまでもない
。Furthermore, the device of the present invention can be used not only for discharging improved materials in the handling process, but also for discharging improved materials in the penetration process. Needless to say, it can also be used for improving soft ground.

（発明の効果） 以上のように、本発明によれば、次のような効果がある
。(Effects of the Invention) As described above, the present invention has the following effects.

■　軟弱地盤に対する撹拌軸の貫入深度や水深が変って
も、また、土庄や水圧の変動があっても、改良材圧送の
ための空気流量を適正かつ迅速に制御し得て、改良材の
吐出口からの吐出旦を自動的に適正にＭ御でき、常に良
質の地盤改良を行わせることができる。■ Even if the depth of penetration of the stirring shaft into soft ground or the water depth changes, or even if there are fluctuations in soil pressure or water pressure, the air flow rate for pressure-feeding improved material can be properly and quickly controlled, and the discharge of improved material can be maintained. The discharge rate from the outlet can be automatically and appropriately controlled, and high-quality ground improvement can always be carried out.

■　装置の自動化が可能となり、従来では撹拌軸１本に
つき流分制御のためにほぼ１人のオペレータが必要であ
ったのを無人化でき、省力化を図ることができ、かつ、
オペレータの精神的疲労を軽減できるとともに、オペレ
ータによる品質のばらつきのｒ８題も解滞できる。■ It is now possible to automate the device, which previously required almost one operator per stirring shaft to control the flow, but it can be automated, saving labor.
Not only can the mental fatigue of the operator be reduced, but also the problem of quality variation among operators can be resolved.

■　従来の手動では、急激な変化に起因する閏塞のおそ
れをなくすために、圧縮空気の供給Ｒｆｆｉをどうして
も多めにしていたが、自動化により、空気ｙｔｆｆｉを
必要最小限に絞ることができ、圧縮空気および改良材の
無駄な消費をなくすことができるとともに、空気圧縮機
の消費動力の節減にも寄与でき、省エネルギー効果を高
めることができる。■ In the conventional manual method, the compressed air supply Rffi was inevitably increased to eliminate the risk of blockage caused by sudden changes, but with automation, the air ytffi can be reduced to the necessary minimum, and the compressed air It is possible to eliminate wasteful consumption of air and improving materials, and also contribute to reducing the power consumption of the air compressor, thereby increasing the energy saving effect.

■　空気ｙＬＷｉの適正なりｉａにより、陸上機におけ
る噴泥現象や、海上機におけるエアリフト現象に起因し
た海水汚濁を極力少なくできる。- By adjusting the air yLWi to an appropriate level, seawater pollution caused by mud-spraying phenomena in land-based aircraft and air-lift phenomena in marine aircraft can be minimized.

【図面の簡単な説明】[Brief explanation of the drawing]

図は本発明の実施例を示す配管およびｉｎ＋＋系統説明
図である。 １・Ｓ・地盤改良様、２・・・ベースマシン、３・・・
り一ダ、６・・・ｍ拌楯、８・・・吐出口、９・・・ｂ
１痒関、１０・・・改良材供給タンク、１１・・・改良
材送出装置、１２・・・送出口、１３・・・開閉弁、１
４・・・改良材供給管路、１９・・・電磁弁、２０・・
・エアレシーバタンク、２１・・・圧縮空気源、２２・
・・メイン管路、２３・・・流量発信器、２４・・・メ
イン流ｆｆｉ：Ｉｎ節介、２５・・−ｉｉ神器、２８・
・・バイパス管路、２９・・・流量発信器、３０・・・
バイパス流の調節弁、３１・・・ｍｉ制御器、Ａ・・・
軟弱地盤。The figure is an explanatory diagram of piping and an in++ system showing an embodiment of the present invention. 1.S.Ground improvement, 2.Base machine, 3.
Ri-da, 6...m Stirring shield, 8...Discharge port, 9...b
1 Itching barrier, 10... Improvement material supply tank, 11... Improvement material delivery device, 12... Delivery port, 13... Opening/closing valve, 1
4... Improvement material supply pipe line, 19... Solenoid valve, 20...
・Air receiver tank, 21... Compressed air source, 22.
...Main pipe line, 23...Flow rate transmitter, 24...Main flow ffi: Insuke, 25...-ii Sacred Treasure, 28.
...Bypass pipe line, 29...Flow rate transmitter, 30...
Bypass flow control valve, 31...mi controller, A...
Soft ground.

Claims (1)

【特許請求の範囲】[Claims] １、先端に撹拌翼を有する撹拌軸を回転ならびに昇降自
在に装備し、かつ、上記撹拌翼による撹拌域に改良材を
吐出する吐出口を備えた地盤改良機と、改良材送出装置
を備えた改良材供給タンクと、該タンクから送出された
改良材を地盤改良機の吐出口に空気圧送する改良材供給
管路と、その空気圧送のための圧縮空気を供給する圧縮
空気供給管路と、圧縮空気供給管路の途中に設けられた
空気流量検出器および空気流量調節器とを具備し、かつ
、上記検出器による空気流量検出値に基いて上記調節器
を作動して上記圧縮空気の供給流量を制御する制御手段
を設けてなることを特徴とする地盤改良機における改良
材供給制御装置。1. A soil improvement machine equipped with a stirring shaft having a stirring blade at the tip that can be rotated and raised and lowered freely, and equipped with a discharge port for discharging improvement material into the area stirred by the stirring blade, and an improvement material delivery device. An improvement material supply tank, an improvement material supply pipeline that pneumatically delivers the improvement material sent out from the tank to the discharge port of the soil improvement machine, and a compressed air supply pipeline that supplies compressed air for the pneumatic delivery. An air flow rate detector and an air flow rate regulator are provided in the middle of the compressed air supply pipe, and the compressed air is supplied by activating the regulator based on the air flow rate detected by the detector. An improvement material supply control device for a ground improvement machine, characterized in that it is provided with a control means for controlling the flow rate.