JPS6070219A - Method and apparatus for improvement of soft ground - Google Patents
Method and apparatus for improvement of soft groundInfo
- Publication number
- JPS6070219A JPS6070219A JP17650983A JP17650983A JPS6070219A JP S6070219 A JPS6070219 A JP S6070219A JP 17650983 A JP17650983 A JP 17650983A JP 17650983 A JP17650983 A JP 17650983A JP S6070219 A JPS6070219 A JP S6070219A
- Authority
- JP
- Japan
- Prior art keywords
- soil
- hollow shaft
- hardening material
- soft ground
- soil hardening
- 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.)
- Pending
Links
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)
Abstract
Description
【発明の詳細な説明】
本発明は、軟弱地盤を改良する工法及び該工法を施工す
るのに使用される装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for improving soft ground and an apparatus used to implement the construction method.
従来、軟弱地盤の改良工法として、ザンドドレーン工法
、ペーパードレン工法等に代えて、軟弱地盤中に、その
現場上を土壌硬化材で固めた地中杭を多数形成させて支
持力をめようとする軟弱地盤の改良工法が行われている
。この地中杭形成工法を大別すると、アースオーガーに
より対象土を地表に捲上げ、地上のミキサーで土壌硬化
相と混練した後にその混線物を再び土中に戻す工法及び
アースオーガーを所定の深度までもみ込んだ後にオーガ
ー先端部よりスラリー状とした硬化材を噴出させ且つア
ースオーガーを回転させつつ土中で土壌硬化材と土を混
練させながらアースオーガーを引抜く工法がある。しか
し、前者の場合、土を一度地表に捲上げてからミキサー
に投入し混線作条を経て土中に戻すので、一本の杭を形
成するのに長い作業時間を要し、また、後者の場合、ア
ースオーガーを引抜きつつ土壌硬化材を噴出させるので
、引抜き速度と土壌硬化材噴出量を厳密に管理しないと
、土壌硬化材と土との配合比にノくラツキを生じて施工
管理を十分に行なうことができず、併せて、混線精度に
も問題があシ、その結果として、設計強度と現物強度に
誤差を生じているのが現実である。Conventionally, as a construction method for improving soft ground, instead of the Zand drain method, paper drain method, etc., attempts were made to increase the bearing capacity by forming a large number of underground piles in the soft ground, hardened with soil hardening material on the site. Improvement methods are being used to improve soft ground. This underground pile formation method can be roughly divided into two methods: a method in which the target soil is raised to the surface with an earth auger, mixed with the hardened soil phase in an above-ground mixer, and then the mixed material is returned to the soil; There is a construction method in which, after the soil has been thoroughly penetrated, a hardening material in the form of a slurry is ejected from the tip of the auger, and the earth auger is pulled out while rotating the soil auger and kneading the soil hardening material and soil in the soil. However, in the former case, the soil is first rolled up to the ground surface, then put into a mixer, passed through mixed rows, and then returned to the soil, so it takes a long time to form a single pile. In this case, the soil hardening material is ejected while the earth auger is being pulled out, so if the extraction speed and the amount of soil hardening material ejected are not strictly controlled, the mixing ratio of the soil hardening material and soil may vary, making it difficult to properly manage construction work. The reality is that there is a problem with crosstalk accuracy, and as a result, an error occurs between the design strength and the actual strength.
本発明によれば、土壌と土壌硬化材との配合比を簡単な
管理で迅速且つ正確に決定し、混線精度を格段に向上さ
せることが可能な地中杭形成法及び装置が提供され、従
来工法における前記の諸問題が解消される。According to the present invention, there is provided an underground pile forming method and apparatus that can quickly and accurately determine the mixing ratio of soil and soil hardening material with simple management, and can significantly improve crosstalk accuracy. The above-mentioned problems in the construction method are resolved.
添付図面に従って具体的に説明すると、本発明の装置は
、第１図に示すように、中空軸４の先端部に掘削スクリ
ュー１が、まだその上方に多数の攪拌羽根３がそれぞれ
取付けられ、且つ、中空軸４の壁を貫いて多数の土壌硬
化材噴出孔２が設けて成るものである。噴出孔２は、第
１図では正面に一列にしか示されていないが、図の背面
や側面にも設けることができ、且つ、第２図に示すよう
に、必要に応じて盲目蓋５を例えばネジによって施すこ
とができるようになっている。More specifically, the apparatus of the present invention, as shown in FIG. , a large number of soil hardening material ejection holes 2 are provided through the wall of a hollow shaft 4. Although the spout holes 2 are only shown in a row on the front in FIG. 1, they can also be provided on the back or side of the figure, and as shown in FIG. For example, it can be applied using screws.
このよう冷装置を使用して本発明の工法を実施するに際
しては、装置を回転させながら土中にもみ込み、所定の
深度に達したときに、その位置において装置を回転させ
ながら所定量の土壌硬化材スラリーを噴出させ、土壌硬
化材と土とを混練する。混線時間及び噴出量は対象土に
よって異寿υ、粘性土のような混練し難い土壌について
は充分に混練できたと確信できるまで同位置で回転を続
ける。この際、更に混線効果を良好にするためには、例
えば攪拌羽根３の間隔すだけ、装置を上下させながら回
転させることが望ましい。斯くして充分混線の目的が達
成されたならば、装置を、必要に応じて回転させながら
、地上へ引き上げ、作業を終了する。When carrying out the construction method of the present invention using such a cooling device, the device is rotated and soaked into the soil, and when a predetermined depth is reached, a predetermined amount of soil is poured into the soil while rotating the device. The hardening material slurry is ejected to mix the soil hardening material and soil. The mixing time and amount of ejection will vary depending on the target soil; for soils that are difficult to mix, such as clayey soil, rotation will continue at the same position until it is certain that sufficient mixing has been achieved. At this time, in order to further improve the cross-talk effect, it is desirable to rotate the apparatus while moving it up and down, for example, by the distance between the stirring blades 3. When the purpose of crosstalk has been sufficiently achieved in this way, the device is lifted to the ground, rotating as necessary, and the work is completed.
盲目蓋５は、主として、地層の種類に応じて硬化材の噴
出量を加減するための調節手段として機能する。例えば
、中空軸の長さ方向中央部に対応する深度の地層が比較
的良質で改良の必要性が低い場合には、中空軸の長さ方
向中央部に位置する噴出孔２の幾つかに蓋５を施すこと
によシ、この部分からの硬化材の噴出量を減少させるこ
とができる。The blind lid 5 mainly functions as an adjusting means for adjusting the amount of hardening material ejected depending on the type of stratum. For example, if the geological strata at the depth corresponding to the longitudinal center of the hollow shaft are of relatively good quality and the need for improvement is low, some of the ejection holes 2 located at the longitudinal center of the hollow shaft may be covered. By applying step 5, it is possible to reduce the amount of hardening material ejected from this portion.
盲目蓋５は、また、中空軸の全長よりも浅い地盤改良の
場合に、地上に出る不必要な噴出孔を閉じるために使用
される。The blind lid 5 is also used to close unnecessary vents exiting to the ground in case of ground improvement shallower than the entire length of the hollow shaft.
比較的長い例えば１８ｍの土中杭を形成する場合に゛お
いて、攪拌羽根及び噴出孔取付は区間の長、さαを３ｍ
としたときは、装置先端を深度１８７７Ｌまでもみ込ん
だ後、上記の如き作業を３ｍを区切りとして６回反復す
れば目的を達する。この方法によれば、１８ｍ全長にわ
たって攪拌羽根及び噴出孔を取付けるのに比して、原動
機にかかる負荷が少なくて効果的である。勿論、長さα
は必ずし”も３ｍに限定するものではない。When forming a relatively long underground pile, for example, 18 m, the length of the section, α, for installing the stirring blade and the jet hole is 3 m.
In this case, the purpose is achieved by digging the tip of the device to a depth of 1877L and repeating the above-mentioned operation six times with intervals of 3 m. According to this method, the load on the prime mover is less and it is more effective than installing stirring blades and jet holes over the entire length of 18 m. Of course, the length α
is not necessarily limited to 3 m.
攪拌羽根３の間隔すは、攪拌羽根３の長さＣと同程度が
好ましい。極端にこの間隔が広くなると、土壌硬化材ス
ラリーの偏在を生じ、また極端に狭くなると羽根相互の
間に土が詰まシ、羽根と土とが一緒に回転する所謂とも
回わシ現象を起すので好ましくない。また、一般に、噴
出孔２の間隔ｄは攪拌羽根３の長さｂと同程度が好まし
く、極端にこの間隔が広くなると、土壌硬化材スラリー
の偏在を生じ、極端に狭くなると、土と土壌硬化材スラ
リーの配合精度が上らず、軸の強度を減する結果となる
。The interval between the stirring blades 3 is preferably approximately the same as the length C of the stirring blades 3. If this distance becomes extremely wide, the soil hardening agent slurry will be unevenly distributed, and if it becomes extremely narrow, soil will become clogged between the blades and the blades and soil will rotate together, causing the so-called spinning phenomenon. Undesirable. In general, it is preferable that the interval d between the ejection holes 2 is about the same as the length b of the stirring blade 3; if this interval becomes extremely wide, the soil hardening agent slurry will be unevenly distributed, and if it becomes extremely narrow, the soil This does not improve the mixing accuracy of the material slurry and results in a decrease in the strength of the shaft.
以上のように、本発明の方法においては、土壌硬化材ス
ラリーが土中に噴出しているときに装置が定位置で回転
しているので、土と土壌硬化材との配合比を土壌硬化材
スラリーの噴出量のみで決定でき、従って正確な土と土
壌硬化材との配合比が容易に得られ、また粘性土のよう
な混練し難い土に対しても装置の回転時間を調節するだ
けで充分な混練精度が得られ、設計強度に近似した土中
杭を形成することができる。As described above, in the method of the present invention, since the device is rotating in a fixed position while the soil hardening agent slurry is being spouted into the soil, the mixing ratio of soil and soil hardening agent can be adjusted to It can be determined only by the amount of slurry ejected, so it is easy to obtain an accurate mixing ratio of soil and soil hardening agent, and even for soils that are difficult to knead, such as clayey soil, by simply adjusting the rotation time of the device. Sufficient kneading accuracy can be obtained, and it is possible to form underground piles that approximate the design strength.
添付図面は本発明の装置を例示するものでろつて、第１
図は正面図（ただし、噴出孔はすべて蓋が施されていな
い状態で示されており、且つ、図の上部は公知の回転駆
動機構に連結されるので省略されている）であシ、第２
図は中空軸の噴出孔における横断面拡大間、（ただし、
例示された２つの噴出孔のうち一方にのみネジ蓋が施さ
れている）である。
図において、１は掘削スクリュー、２は噴出孔、３は攪
拌羽根、４は中空軸、５は蓋である。
第１図
第２図The accompanying drawings are intended to illustrate the apparatus of the present invention.
The figure is a front view (however, all the jet holes are shown without lids, and the upper part of the figure is omitted because it is connected to a known rotary drive mechanism). 2
The figure shows an enlarged cross-sectional view of the hollow shaft nozzle (however,
Only one of the two illustrated ejection holes is provided with a screw cap). In the figure, 1 is a drilling screw, 2 is an ejection hole, 3 is a stirring blade, 4 is a hollow shaft, and 5 is a lid. Figure 1 Figure 2
Claims (1)
に土壌硬化材噴出孔がそれぞれ設けられた中空軸から成
る装置を、軟弱地盤中へ所定深度にもみ込み、その位置
において、土壌硬化材を噴出孔から噴出させながら該装
置を回転させることによって、土壌硬化材と土壌とを混
練したのち、該装置を引き上げる、ことを特徴とする軟
弱地盤の改良工法。 ２ 回転駆動可能な中空軸；該中空軸の先端部に設けら
れた、土壌を掘削推進するためのスクリュー；該中空軸
の外周部に設けられた、掘削土壌を攪拌するだめの多数
の羽根：該中空軸の周壁に開口された、土壌硬化材供給
源からの土壌硬化材を中空軸の内部から外部へ噴出させ
るだめの多数の孔；並びに、該噴出孔を必要に応じて閉
じるだめの蓋から成ることを特徴とする軟弱地盤改良用
装置。[Scope of Claims] 1. A device consisting of a hollow shaft having a drilling screw at the tip, a stirring blade at the outer periphery, and a soil hardening material spouting hole at the peripheral wall is inserted into soft ground to a predetermined depth. A method for improving soft ground, comprising: rotating the device while ejecting the soil hardening material from an ejection hole at the location, kneading the soil hardening material and soil, and then pulling up the device. 2. A hollow shaft that can be rotated; a screw provided at the tip of the hollow shaft for excavating and propelling the soil; a large number of blades provided on the outer periphery of the hollow shaft for stirring the excavated soil: A large number of holes opened in the peripheral wall of the hollow shaft for spouting soil hardening material from the soil hardening material supply source from the inside of the hollow shaft to the outside; and a lid for closing the spout holes as necessary. A device for improving soft ground characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17650983A JPS6070219A (en) | 1983-09-26 | 1983-09-26 | Method and apparatus for improvement of soft ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17650983A JPS6070219A (en) | 1983-09-26 | 1983-09-26 | Method and apparatus for improvement of soft ground |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6070219A true JPS6070219A (en) | 1985-04-22 |
Family
ID=16014871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17650983A Pending JPS6070219A (en) | 1983-09-26 | 1983-09-26 | Method and apparatus for improvement of soft ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6070219A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5818421A (en) * | 1994-12-21 | 1998-10-06 | Hitachi, Ltd. | Input interface apparatus for large screen display |
| EP1792643A1 (en) * | 2005-12-05 | 2007-06-06 | Buss-SMS-Canzler GmbH | High volume reactor and/or thin film evaporator employing a premixing device |
| CN101831899A (en) * | 2010-04-15 | 2010-09-15 | 李善文 | Mixed compaction integral mechanism for dike non-slipping solid material |
| JP2017179756A (en) * | 2016-03-29 | 2017-10-05 | エポコラム機工株式会社 | Method and device for ground improvement |
-
1983
- 1983-09-26 JP JP17650983A patent/JPS6070219A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5818421A (en) * | 1994-12-21 | 1998-10-06 | Hitachi, Ltd. | Input interface apparatus for large screen display |
| EP1792643A1 (en) * | 2005-12-05 | 2007-06-06 | Buss-SMS-Canzler GmbH | High volume reactor and/or thin film evaporator employing a premixing device |
| US7964059B2 (en) | 2005-12-05 | 2011-06-21 | Buss-Sms-Canzler Gmbh | Large volume reactor or thin film evaporator with a premixing unit |
| CN101831899A (en) * | 2010-04-15 | 2010-09-15 | 李善文 | Mixed compaction integral mechanism for dike non-slipping solid material |
| JP2017179756A (en) * | 2016-03-29 | 2017-10-05 | エポコラム機工株式会社 | Method and device for ground improvement |
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