JPS6251327B2 - - Google Patents
Info
- Publication number
- JPS6251327B2 JPS6251327B2 JP56056431A JP5643181A JPS6251327B2 JP S6251327 B2 JPS6251327 B2 JP S6251327B2 JP 56056431 A JP56056431 A JP 56056431A JP 5643181 A JP5643181 A JP 5643181A JP S6251327 B2 JPS6251327 B2 JP S6251327B2
- Authority
- JP
- Japan
- Prior art keywords
- stabilizer
- pressure
- ground
- compressed air
- stirring blade
- 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.)
- Expired
Links
- 239000003381 stabilizer Substances 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 2
- 239000002689 soil Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
- E02D3/126—Consolidating by placing solidifying or pore-filling substances in the soil and mixing by rotating blades
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【発明の詳細な説明】
粉状若しくは粒状の地盤安定剤（セメントや生
石灰等、以下単に安定剤という）と圧縮空気の混
合流体を軟弱地盤中で回転する撹拌翼内の吐出口
から吐出させ、、安定剤と地盤土壌を撹拌混合し
て軟弱地盤を改良する工法は、既に知られている
が、この従来工法では、混合流体の吐出圧力が弱
くて地盤土壌が撹拌翼及び吐出口に逆流したり、
これとは逆に混合流体の吐出圧力が強過ぎて余分
の圧縮空気を地盤中に放出するということが屡々
発生している。[Detailed Description of the Invention] A mixed fluid of powdered or granular ground stabilizer (cement, quicklime, etc., hereinafter simply referred to as stabilizer) and compressed air is discharged from a discharge port in a stirring blade rotating in soft ground, A method of improving soft ground by stirring and mixing a stabilizer and ground soil is already known, but in this conventional method, the discharge pressure of the mixed fluid is weak and the ground soil flows back into the stirring blade and discharge port. Or,
On the contrary, it often happens that the discharge pressure of the mixed fluid is too strong and excess compressed air is discharged into the ground.
本発明は、この点に鑑みてなされたものであつ
て、混合流体の吐出圧力を撹拌翼が位置する地盤
深度における受働土圧と主働土圧の間に制御する
ことにより、前述のようなことが起こらないで、
安定剤の適正な吐出がなされるようにしたもので
ある。 The present invention has been made in view of this point, and by controlling the discharge pressure of the mixed fluid between the passive earth pressure and the active earth pressure at the ground depth where the stirring blade is located, the above-mentioned problems can be achieved. does not happen,
This is to ensure proper discharge of the stabilizer.
本発明を実施するには例えば図示のような装置
を用いるが、この装置において、１は回転軸であ
つて、機体１０に懸吊された回転駆動機２より下
方に延び、下端に撹拌翼３を具えている。 To carry out the present invention, for example, a device as shown in the drawings is used. In this device, 1 is a rotating shaft, which extends downward from a rotary drive machine 2 suspended from a body 10, and has stirring blades 3 at its lower end. It is equipped with
回転軸１は中空で、中を安定剤供給管４′が通
つており、安定剤供給管４′の上端には、図示し
ないスイベル機構を介して安定剤供給ホース４が
連結されている。そして、安定剤供給ホース４は
図示しない供給源から送られた圧縮空気に安定剤
を供給する安定剤供給機５に連通している。 The rotating shaft 1 is hollow, and a stabilizer supply pipe 4' passes through it, and the stabilizer supply hose 4 is connected to the upper end of the stabilizer supply pipe 4' via a swivel mechanism (not shown). The stabilizer supply hose 4 is connected to a stabilizer supply machine 5 that supplies stabilizer to compressed air sent from a supply source (not shown).
安定剤供給管４′の下端は撹拌翼３内に開口す
る吐出口６で終わり、この吐出口６から安定剤と
圧縮空気の混合流体が吐出される。 The lower end of the stabilizer supply pipe 4' ends at a discharge port 6 that opens into the stirring blade 3, from which a mixed fluid of stabilizer and compressed air is discharged.
この際、回転軸１を回転駆動機２により回転さ
せることにより、吐出された安定剤は地盤土壌と
撹拌混合され、又、更に回転駆動機２をリーダー
７に沿つて下降若しくは上昇させることにより、
撹拌翼３の移動範囲の土壌が処理される。 At this time, by rotating the rotary shaft 1 by the rotary drive machine 2, the discharged stabilizer is stirred and mixed with the ground soil, and by further lowering or raising the rotary drive machine 2 along the leader 7,
The soil within the movement range of the stirring blades 3 is treated.
本発明は、安定剤と圧縮空気の混合流体が吐出
口６から吐出する際の圧力をその地点の土圧とう
まく釣り合うように制御する点に特徴を有するも
のである。 The present invention is characterized in that the pressure at which the mixed fluid of stabilizer and compressed air is discharged from the discharge port 6 is controlled so as to balance well with the earth pressure at that point.
一般に、地盤深度をＺ，粘性土の単位体積重量
をｒc，その深度での地盤強度をＣとすると、Ｚ
地点のランキン土圧σrは、
σr＝ｒc・Ｚ±2C …(1)
で表わされ、Ｃは一般の沖積粘土ではＺに比例す
るから、
Ｃ＝α・Ｚ …(2)
ここに、α：比例常数
であり、(1)式に(2)式を代入して、
σc＝Ｚ（ｒc±２α）
ここに、Ｚ（ｒc＋２α）：受働土圧
Ｚ（ｒc−２α）：主働土圧
となる。 In general, if the ground depth is Z, the unit weight of clay soil is r c , and the ground strength at that depth is C, then Z
The Rankine earth pressure σ r at a point is expressed as σ r =r c・Z±2C …(1), and since C is proportional to Z in general alluvial clay, C=α・Z …(2) Here , α is a proportional constant, and by substituting equation (2) into equation (1), we get σ c =Z(r c ±2α), where Z(r c +2α): Passive earth pressure Z(r c -2α): Active earth pressure.
本発明では、安定剤と圧縮空気の混合流体の吐
出口６における吐出圧力をＰ，吐出口６が位置す
る地盤深度をＺpとして
Ｚp（ｒc−２α）＜Ｐ＜Ｚp（ｒc＋２α）
が成立するようにＰを制御する。 In the present invention, where P is the discharge pressure of the mixed fluid of stabilizer and compressed air at the discharge port 6, and Z p is the ground depth where the discharge port 6 is located, Z p (r c −2α)<P<Z p (r c +2α) P is controlled so that the following holds true.
Ｐは安定剤供給機５の吐出圧力から途中の圧力
損失を減じたものであるから、Ｐは安定剤供給機
５の吐出圧力を圧力制御弁８で制御することによ
り制御することができる。 Since P is the discharge pressure of the stabilizer feeder 5 minus the pressure loss along the way, P can be controlled by controlling the discharge pressure of the stabilizer feeder 5 with the pressure control valve 8.
図示の装置では、回転軸１と安定剤供給管４′
の間の空隙をスイベル９の部分で回収ホース１１
に連通させて、使用済の圧縮空気を回収するよう
にしている。 In the illustrated device, the rotating shaft 1 and the stabilizer supply pipe 4'
Use the swivel 9 to fill the gap between the recovery hose 11
The used compressed air is recovered by communicating with the air compressor.
回収ホース１１は分離機１２，減圧弁１３を経
て大気に開口しており、Ｐの制御に当つては、圧
力制御弁８による制御と併行して減圧弁１３によ
る制御を行うとよい。 The recovery hose 11 is opened to the atmosphere via a separator 12 and a pressure reducing valve 13, and when controlling P, it is preferable to control the pressure reducing valve 13 in parallel with the control by the pressure control valve 8.
なお、分離機１２は、例えばフイルターであつ
て、回収された圧縮空気中に含まれている安定剤
を分離し、分離された安定剤はそのままか若しく
は若干調整して再使用することができる。 Note that the separator 12 is, for example, a filter, and separates the stabilizer contained in the recovered compressed air, and the separated stabilizer can be reused as is or after being slightly adjusted.
本発明では、撹拌翼内の吐出口から吐出される
安定剤と圧縮空気の混合流体の吐出圧力を撹拌翼
が位置する地盤深度における受働土圧と主働土圧
の間に制御しているので、吐出圧力が土圧とうま
く釣り合つて、安定剤の適正な吐出がなされ、し
かも前述の実施例のように使用済の圧縮空気を回
収するにしても、その回収が円滑かつ確実になさ
れる利点がある。 In the present invention, the discharge pressure of the mixed fluid of stabilizer and compressed air discharged from the discharge port in the stirring blade is controlled between the passive earth pressure and the active earth pressure at the ground depth where the stirring blade is located. The advantage is that the discharge pressure is well balanced with the earth pressure, the stabilizer is properly discharged, and even when used compressed air is recovered as in the above embodiment, the recovery is smooth and reliable. There is.
図面は本発明の実施に用いる装置の一例を示す
概略側面図である。
１：回転軸、２：回転駆動機、３：撹拌翼、
４′：安定剤供給管、４：安定剤供給ホース、
５：安定剤供給機、６：吐出口、８：圧力制御
弁。
The drawing is a schematic side view showing an example of an apparatus used for carrying out the present invention. 1: Rotating shaft, 2: Rotating drive machine, 3: Stirring blade,
4': Stabilizer supply pipe, 4: Stabilizer supply hose,
5: Stabilizer feeder, 6: Discharge port, 8: Pressure control valve.
Claims (1)
混合流体を軟弱地盤中で回転する撹拌翼内の吐出
口から吐出させる際に、その吐出圧力を撹拌翼が
位置する地盤深度における受働土圧と主働土圧の
間に制御することを特徴とする軟弱地盤改良工
法。1. When a mixed fluid of powdered or granular ground stabilizer and compressed air is discharged from the discharge port in a stirring blade rotating in soft ground, the discharge pressure is calculated as the passive earth pressure at the depth of the ground where the stirring blade is located. A soft ground improvement method characterized by controlling the active earth pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5643181A JPS57172027A (en) | 1981-04-15 | 1981-04-15 | Improvement work for soft ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5643181A JPS57172027A (en) | 1981-04-15 | 1981-04-15 | Improvement work for soft ground |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57172027A JPS57172027A (en) | 1982-10-22 |
| JPS6251327B2 true JPS6251327B2 (en) | 1987-10-29 |
Family
ID=13026894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5643181A Granted JPS57172027A (en) | 1981-04-15 | 1981-04-15 | Improvement work for soft ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57172027A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH079092B2 (en) * | 1987-11-26 | 1995-02-01 | 株式会社大林組 | Low strength adjustment ground improvement method |
| FI123541B (en) * | 2011-06-28 | 2013-06-28 | Allu Group Oy | A method for removing binder transfer air from a mixture of compressed air and binder while stabilizing soil masses by means of binder addition |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4985809A (en) * | 1972-12-25 | 1974-08-16 | ||
| JPS53139311A (en) * | 1977-05-11 | 1978-12-05 | Fudo Construction Co | Method of placing sand pile |
-
1981
- 1981-04-15 JP JP5643181A patent/JPS57172027A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4985809A (en) * | 1972-12-25 | 1974-08-16 | ||
| JPS53139311A (en) * | 1977-05-11 | 1978-12-05 | Fudo Construction Co | Method of placing sand pile |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57172027A (en) | 1982-10-22 |
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