JPS60258320A - Method and device of improving soft ground - Google Patents
Method and device of improving soft groundInfo
- Publication number
- JPS60258320A JPS60258320A JP11385784A JP11385784A JPS60258320A JP S60258320 A JPS60258320 A JP S60258320A JP 11385784 A JP11385784 A JP 11385784A JP 11385784 A JP11385784 A JP 11385784A JP S60258320 A JPS60258320 A JP S60258320A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- soft ground
- air
- soft
- 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
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
本発明は固化剤を圧縮空気と共に軟弱地盤中に噴射して
固化剤と軟弱土とを混合撹拌する強化処理を軟弱地盤中
に挿入した鋼管内で行うことにより、固化剤の大気中へ
の飛散を防止することのできる軟弱地盤の改良方法及び
装置に関するものである。In the present invention, the solidifying agent is injected into the soft ground together with compressed air, and the solidifying agent and the soft soil are mixed and stirred in a steel pipe inserted into the soft ground to strengthen the soil, thereby reducing the scattering of the solidifying agent into the atmosphere. The present invention relates to a method and device for improving soft ground that can prevent this.
軟弱地盤の土地改良方法の一つとして以前からセメント
、石灰等の固化剤のスラリーを軟弱地盤中に挿入された
中空管を経て噴射し、軟弱土と同化剤のスラリーとを混
合撹拌することによって化学的に軟弱土を強化する深層
混合処理方法が実施されていた。しかしながらこの方法
は、もともと高い含水率の軟弱地盤に対して同化剤のス
ラリーとして水を多量に注入することになるため、軟弱
地盤が盛り上ったり、更に所定の地盤強度とするには増
加したスラリー中の水分に見合う分の同化剤量が余分に
必要となるなどの大きな欠点があつた。そこで最近では
、このような欠点をなくすために固化剤を粉体のまま圧
縮空気を媒体として軟弱地盤中に挿入された中空管を経
て噴射して固化剤と軟弱土とを混合撹拌することによっ
て軟弱地盤を強化する噴射撹拌方法が実施されるように
なった。この方法は固化剤のスラリーを使用する深層混
合処理方法に比べ、噴射の媒体に使用した空気の大部分
を大気中に逃がすことにより地盤の盛り上がりがなく、
又軟弱地盤中に余分な水を注入することがないから固化
剤の使用量が少なくて済み、更に、深層混合処理方法で
は必要なセメント等の固化剤と水とを混合、圧送するた
めの大規模な設備を必要とせずにサイロ、計量器、コン
プレッサ等の汎用性ある小規模な設備で足りるなどの利
点をもたらした。One of the land improvement methods for soft ground has been to inject a slurry of solidifying agents such as cement and lime through a hollow tube inserted into the soft ground, and mix and stir the soft soil and the slurry of assimilating agents. A deep mixing treatment method was used to chemically strengthen soft soil. However, this method requires a large amount of water to be injected into the soft ground, which already has a high water content, as an assimilating agent slurry, which may cause the soft ground to heave up or increase the required ground strength. There were major drawbacks such as the need for an extra amount of assimilating agent to compensate for the amount of water in the slurry. Recently, in order to eliminate this drawback, a method has been developed to mix and stir the solidifying agent and soft soil by injecting the solidifying agent in powder form through a hollow tube inserted into the soft ground using compressed air as a medium. As a result, injection stirring methods have been implemented to strengthen soft ground. Compared to the deep mixing treatment method that uses solidifying agent slurry, this method eliminates the heaving of the ground by allowing most of the air used as the injection medium to escape into the atmosphere.
In addition, because there is no need to inject excess water into soft ground, the amount of solidifying agent used can be reduced. This has the advantage of not requiring large-scale equipment, but instead requiring small-scale, versatile equipment such as silos, measuring instruments, and compressors.
しかしながらこの噴射撹拌処理方法では、噴射された同
化剤の一部が空気と共に地盤中を通って大気中に放出さ
れるために、陸上施工においては粉塵公害発生の恐れが
あり、海上施工においては水質汚濁の発生や空気の噴出
による海底地盤の撹乱の恐れがあり、又このような社会
問題以外に特に大深水の位置での施工においては噴射用
の中空管が地盤への挿入時に座屈したり、或は曲げモー
メントに耐えないと言う欠点があった。本発明はこのよ
うな問題点を解決しようとするものである。However, with this injection agitation treatment method, a part of the injected assimilation agent passes through the ground together with the air and is released into the atmosphere, so there is a risk of dust pollution in land-based construction, and water pollution in offshore construction. There is a risk of pollution and the disturbance of the seabed ground due to the air being blown out.In addition to these social problems, there is also the risk that hollow injection pipes may buckle when inserted into the ground, especially when construction is carried out in deep water. , or they have the disadvantage of not being able to withstand bending moments. The present invention attempts to solve these problems.
すなわち本発明の一つは上記問題点を解決するための軟
弱地盤の改良方法に関するものであって、軟弱地盤中に
固化剤を圧縮空気と共に噴射して混合撹拌する強化処理
を行うことによって軟弱地盤を強化するに当り、鋼管を
該鋼管内に取り込まれる軟弱土を圧密させない状態とし
て軟弱地盤の所定深さまで挿入した後、該鋼管を引き抜
きつつ該鋼管内に取り込まれている軟弱土を撹拌器を使
用して強化処理し且つ噴射された空気は鋼管内の上方空
洞部に集めて濾過して放出することを特徴とする。又本
発明の他力一つは上記問題点を解決するための軟弱地盤
の改良装置に関するものであって、外殻を構成する鋼管
と、該鋼管内に回転自在に貫挿されており該鋼管内に位
置する下端部に噴射孔を有する中空の回転軸外周に螺旋
状に固設されているスクリュ面に１周当り１個以上の通
気孔を回転軸の軸方向に有するオーガスクリュと、該鋼
管の下端部に位置する上記オーガスクリュの回転軸の下
端部近傍に１枚以上の撹拌翼が１段以上取り付けられて
成る撹拌器と、鋼管の頭部に設置されていて上記オーガ
スクリュの回転軸を正逆いずれにも回転せしめ得る駆動
源と、鋼管内の上方でオーガスクリュの回転軸の中空部
に連通して取り付けられており同化剤及び圧縮空気を圧
入するための圧入管と、鋼管内の上方に形成される上方
空洞部に連通ずる濾過器付空気排出管と、鋼管外壁に取
り付けられた垂直移動手段とから成ることを特徴とする
。
以下に本発明を図面を用いて詳細に説明する。
第１図は本発明装置の１実施例をその１部を切欠して示
す側面説明図、第、２図は第１図のＸ−Ｘ線断面説明図
、第３図（イ）、（ロ）及び（ハ）はそれぞれ第１図の
Ｙ−Ｙ線の位置から見たときの撹拌翼の枚数を異にする
撹拌器を示す説明図、第４図（イ）及び（ロ）はそれぞ
れ撹拌翼の段数を異にする撹拌器を示す側面説明図、第
５図（ａ）〜（ｆ）は本発明方法の１実施例を工程順に
模式的に示す工程説明図である。That is, one of the present inventions relates to a method for improving soft ground in order to solve the above-mentioned problems, and the method involves strengthening the soft ground by injecting a solidifying agent into the soft ground together with compressed air and mixing and stirring. To strengthen the steel pipe, the steel pipe is inserted into the soft ground to a predetermined depth without consolidating the soft soil taken into the steel pipe, and then the soft soil taken into the steel pipe is removed using an agitator. It is characterized in that the air used for reinforcement treatment and injected is collected in an upper cavity within the steel pipe, filtered, and released. Another advantage of the present invention is a soft ground improvement device for solving the above-mentioned problems, which includes a steel pipe forming the outer shell, and a steel pipe rotatably inserted into the steel pipe. an auger screw having one or more ventilation holes per rotation in the axial direction of the rotating shaft on the screw surface fixed in a spiral manner on the outer periphery of a hollow rotating shaft having an injection hole at the lower end located inside; A stirrer comprising one or more stirring blades attached in one or more stages near the lower end of the rotating shaft of the auger screw located at the lower end of the steel pipe, and a stirrer installed at the head of the steel pipe to rotate the auger screw. A drive source that can rotate the shaft in both forward and reverse directions, a press-fitting pipe that is installed above the steel pipe so as to communicate with the hollow part of the rotating shaft of the auger screw for press-fitting assimilate and compressed air, and the steel pipe. It is characterized by comprising an air exhaust pipe with a filter that communicates with an upper cavity formed in the upper part of the pipe, and a vertical movement means attached to the outer wall of the steel pipe. The present invention will be explained in detail below using the drawings. Fig. 1 is an explanatory side view showing one embodiment of the device of the present invention with a part thereof cut away, Figs. ) and (c) are explanatory diagrams showing agitators with different numbers of stirring blades when viewed from the position of the Y-Y line in Fig. 1, respectively, and Fig. 4 (a) and (b) are explanatory diagrams showing agitators with different numbers of stirring blades, respectively. FIGS. 5(a) to 5(f) are explanatory side views showing agitators having different numbers of stages of blades, and are process explanatory views schematically showing one embodiment of the method of the present invention in the order of steps.
先ず本発明方法を説明する。従来の軟弱地盤の改良方法
は四周に連続する軟弱地盤に何らの仕切壁を設けること
もなく開放状態のまま強化処理を行っていたのに対し、
本発明方法は鋼管を軟弱地盤中に挿入してこの鋼管内で
強化処理を行い、噴出された空気は鋼管内の上方に集め
′て濾過してから大気中に放出しようとするものである
。鋼管の軟弱地盤中への挿入は鋼管内に取り込まれる軟
弱土を圧密させない状態で行い、所定深さに達した後に
鋼管を引き抜きつつ強化処理すなわち同化剤を圧縮空気
と共に鋼管内に噴射して軟娼土と混合撹拌するのである
が、この混合撹拌を鋼管の周壁で囲まれた狭い空間内で
撹拌器を使用して行うことにより混合撹拌は極めて効果
的である。噴射された空気のうち微量は水に溶解したり
軟弱土中に吸着されたりするが、大部分は軟弱土に混合
されなかった一部の固化剤を含んだ状態で軟弱土層を上
昇する。これを鋼管内の上方に集めて鋼管外に導き、濾
過して固化剤を含まない状態にして大気中に放出するの
である。First, the method of the present invention will be explained. In contrast to the conventional method of improving soft ground, which involves strengthening the continuous soft ground in an open state without installing any partition walls,
The method of the present invention involves inserting a steel pipe into soft ground, performing a strengthening process within the steel pipe, and collecting the ejected air above the steel pipe, filtering it, and then releasing it into the atmosphere. A steel pipe is inserted into soft ground without consolidating the soft soil taken into the steel pipe, and after reaching a predetermined depth, the steel pipe is pulled out and strengthened by injecting an assimilate into the steel pipe together with compressed air to soften it. It is mixed and stirred with the clay, and by using a stirrer to perform this mixing and stirring in a narrow space surrounded by the peripheral wall of a steel pipe, the mixing and stirring is extremely effective. A small amount of the injected air dissolves in water or is adsorbed into the soft soil, but most of it rises through the soft soil layer, containing some solidification agent that was not mixed into the soft soil. This is collected in the upper part of the steel pipe, guided out of the steel pipe, filtered, and released into the atmosphere in a state free of solidifying agents.
次に本発明方法を実施するのに好適な本発明装置を第１
図〜第４図を用いて説明する。
図面中、１はその中で強化処理を行う鋼管であって、上
端は閉塞され下端は開口しており本発明装置の外殻を構
成する。２はオーガスクリュであって回転軸３とスクリ
ュ面４とから成る。回転軸３は鋼管１内に軸受５により
回転自在に支持されて貫挿されており、内部は圧縮空気
と固化剤とを通すための中空部を形成しており、鋼管１
内に位置する下端部に中空部と連通ずる噴射孔３ａを有
して ′いる。スクリュ面４は回転軸３の外周に鋼管１
内の下端部に近い位置から上方に向って螺旋状に固設さ
れている。このスクリュ面４の下端から上端までの高さ
は軟弱地盤を強化処理する深さ以上あれば良く、汎用性
を見込んで適宜設定される。スクリュ面４は空気が円滑
に上昇するようにその１周当り１個以上の通気孔４ａを
回転軸３の軸方向に有している。この通気孔４ａは空気
が回転軸３に沿って上昇し易いように第１図に示す如く
回転軸３の外周面に接するように設けられているのが好
ましい。回転軸３の断面形状は円形、矩形その他任意の
形状をとることができる（本例は第２図に示す如く正方
形）。６は軟弱土と固化剤とを混合撹拌するための撹拌
器であって、鋼管１の下端部に位置するオーガスクリュ
２の回転軸３の下端部近傍に１枚以上の撹拌翼７が１段
以上取り付けられて構成されている。第３図（イ）、（
ロ）及び（ハ）はそれぞれ撹拌翼７が１枚、２枚及び３
枚の場合を示し、又第４図（イ）及び（ロ）はそれぞれ
撹拌翼７が１段及び２段に取り付けられている場合を示
す。
第１図の実施例は１段の撹拌翼７から成る撹拌器６が２
個取り付けられているものである。このような撹拌器６
は、オーガスクリュ２の回転軸３の鋼管１内に位置する
下端部に取り付けられていることが鋼管１内で軟弱土の
強化処理を行う上で好ましく、更に回転軸３の鋼管１外
に位置する下端部にも第１図に示すように取り付けられ
ていても良く、この場合は鋼管１内で強化処理された軟
弱土と鋼管１外周辺の土砂との混合を行うために鋼管１
の外径よりも大きい径を有することが好ましい。８は駆
動源であって鋼管１の頭部に設置されてオーガスクリュ
２の回転軸３に連枯されており、油圧または電気動力に
より回転軸３を正逆いずれの方向にも回転せしめること
ができる。９は固化剤及び圧縮空気をオーガスクリュ２
の回転軸３の中空部に圧入するための圧入管であって、
鋼管１内の上方で回転軸３の中空部に連通して例えばス
イベルジヨイント１０により回転軸３−に取り付けられ
ている。１１は濾過器付空気排出管であって鋼管１の上
方に形成される上方空洞部１２に連通しており、鋼管１
内を下方から上昇して上方空洞部１２に集められた固化
剤含有空気を濾過器（図示せず）を通して大気中に放出
せしめる。このような作用を増強するためにこの濾過器
付空気排出管１１を吸引装置（図示せず）に接続するこ
ともある。１３は鋼管１の外壁に取り付けられた垂直移
動手段であって、通常鋼管１の外壁に連結部１４を介し
て連結されていてウィンチ（図示せず）などにより垂直
方向に引張られるワイヤ１５と、鋼管１を垂直移動させ
るときに移動方向を垂直方向に維持するため固定された
リードパイプ１６によりガイドされるガイド部１７とが
ら成る。第１図では上方に引き上げるためのワイヤ１５
と例えば作業船の甲板りに固定されたシーブＰを経て下
方へ引張るためのワイヤ１５との２本示しているが、例
えば自重又はバイブロハンマで鋼管１を挿入するときは
下方に引張るためのワイヤ１５は不必要である。Next, the apparatus of the present invention suitable for carrying out the method of the present invention is installed in the first place.
This will be explained using FIGS. In the drawings, reference numeral 1 denotes a steel pipe in which strengthening treatment is performed, the upper end of which is closed and the lower end open, constituting the outer shell of the apparatus of the present invention. Reference numeral 2 denotes an auger screw, which is composed of a rotating shaft 3 and a screw surface 4. The rotating shaft 3 is inserted into the steel pipe 1 while being rotatably supported by a bearing 5, and the inside forms a hollow part for passing compressed air and a solidifying agent.
The lower end portion located inside has an injection hole 3a that communicates with the hollow portion. The screw surface 4 has a steel pipe 1 on the outer periphery of the rotating shaft 3.
It is fixed in a spiral shape upwards from a position near the lower end of the inside. The height from the lower end to the upper end of this screw surface 4 is sufficient as long as it is at least a depth for strengthening soft ground, and is appropriately set in consideration of versatility. The screw surface 4 has one or more ventilation holes 4a per circumference in the axial direction of the rotating shaft 3 so that air can rise smoothly. This vent hole 4a is preferably provided so as to be in contact with the outer peripheral surface of the rotating shaft 3, as shown in FIG. 1, so that air can easily rise along the rotating shaft 3. The cross-sectional shape of the rotating shaft 3 can be circular, rectangular, or any other arbitrary shape (in this example, it is square as shown in FIG. 2). Reference numeral 6 denotes a stirrer for mixing and stirring the soft soil and the solidification agent, and one or more stirring blades 7 are arranged in one stage near the lower end of the rotating shaft 3 of the auger screw 2 located at the lower end of the steel pipe 1. The above is installed and configured. Figure 3 (a), (
B) and (C) have one, two, and three stirring blades 7, respectively.
FIGS. 4A and 4B show cases in which the stirring blades 7 are installed in the first and second stages, respectively. In the embodiment of FIG. 1, the stirrer 6 consisting of one stage of stirring blades 7 is
It is installed separately. Such a stirrer 6
is preferably attached to the lower end of the rotating shaft 3 of the auger screw 2 located inside the steel pipe 1 in order to strengthen the soft soil within the steel pipe 1. In this case, the steel pipe 1 may be attached to the lower end of the steel pipe 1 as shown in FIG.
It is preferable to have a diameter larger than the outer diameter of. Reference numeral 8 denotes a drive source, which is installed at the head of the steel pipe 1 and connected to the rotating shaft 3 of the auger screw 2, and can rotate the rotating shaft 3 in either the forward or reverse direction by hydraulic or electric power. can. 9 is the auger screw 2 for solidifying agent and compressed air.
A press-fit tube for press-fitting into a hollow part of a rotating shaft 3,
It communicates with the hollow part of the rotating shaft 3 at the upper part of the steel pipe 1 and is attached to the rotating shaft 3- by, for example, a swivel joint 10. Reference numeral 11 denotes an air exhaust pipe with a filter, which communicates with an upper cavity 12 formed above the steel pipe 1.
The solidifying agent-containing air rising from below and collected in the upper cavity 12 is discharged into the atmosphere through a filter (not shown). In order to enhance this effect, the filtered air discharge pipe 11 may be connected to a suction device (not shown). 13 is a vertical moving means attached to the outer wall of the steel pipe 1, and includes a wire 15 that is normally connected to the outer wall of the steel pipe 1 via a connecting part 14 and is pulled vertically by a winch (not shown) or the like; The guide part 17 is guided by a fixed lead pipe 16 in order to maintain the moving direction vertically when the steel pipe 1 is moved vertically. In Fig. 1, a wire 15 for pulling upwards is shown.
For example, when inserting the steel pipe 1 using its own weight or a vibro hammer, the wire 15 is used to pull it downward through a sheave P fixed to the deck of a work boat. is unnecessary.
【本発明装置を使用した本発明方法の実施例】。
以上の構成を有する本発明装置を使用して海底の軟弱地
盤を改良する実施例を第５図により説明する。
先ず、軟弱地盤改良工事用の作業船に本発明装置を装備
し、所定の場所において第５図（ａ）及び（ｂ）に示す
如くオーガスクリュ２を回転（撹拌器６も回転する）さ
せながら本発明装置を軟弱地盤Ａ中に挿入する。この際
、噴射孔３ａｔ′ｆ目詰りしないように断続的に又連続
的に少量の空気を噴射孔３ａから噴射させる。又鋼管１
内に取り込まれた軟弱土の上面１ｔｆ’ｔＡ底地盤面し
とほぼ同じレベルとなるようにオーガスクリュ２の回転
速度とワイヤ１５（第５図では省略）による鋼管１の挿
入速度とを調節すれば、鋼管１内に取り込まれた軟弱土
を圧密させないで軟弱地盤Ａ中に鋼管１を挿入すること
になる。このようにして第５図（Ｃ）に示す如く鋼管１
の先端が所定の深度に達したときに、オーガスクリュ２
と撹拌器６とを逆回転させながら圧縮空気と同化剤とを
圧入管９から回転軸３内に圧入して噴射孔３ａから噴射
すると、鋼管１内では固化剤が鋼管１内の上端部付近に
ある軟弱土と充分に混合撹拌されて強化処理が行われて
おり、この状態で本発明装置自体を第５図（ＣＩ）に示
す如く引き抜いてゆく。この本発明装置の引抜きは、オ
ーガスクリュ２の逆回転による上昇力と必要に応じてウ
ィンチにより引張られる引抜き用のワイヤ１５を使用す
る引き上げによるが、挿入時と同様に鋼管１内の軟弱土
の上面ｌが海底地盤面りとほぼ同じレベルになるように
調節することにより、第５図（ｅ）の如く鋼管１の下端
が海底地盤面りを離れたときに強化処理済みの地盤部分
Ｂの上面と周囲の海底地盤面りとがほぼ一致したものと
なる。
強化処理中の鋼管１内では強化処理が行われると共に軟
弱土と混合撹拌されなかった一部の固化剤は、噴射され
た空気と共に鋼管１内を主として回転軸３に沿ってスク
リュ面４の通気孔４ａを通過しながら上昇し、鋼管１内
の上方空洞部１２に集められ、濾過器付空気排出管１１
を経て濾過器により固化剤を除去された空気となって大
気中へ放出されるのである。このようにして第５図（ｅ
）の如く所定場所での強化処理が終了すれば、本発明装
置を第５図（ｆ）の如く更に海面上に引き上げて次の所
定の場所の上方まで移動せしめ、前記と同様に本発明装
置を軟弱地盤Ａ中に挿入して強化処理を行うのである。
上記の如く強化処理を行えば、第５図の如く軟弱地盤は
杭状に強化される。若し、軟弱地盤△を連続壁或はブロ
ック状の強化地盤に改良しようとするときは、オーガス
クリュ２の回転軸３の鋼管１内に位置する下端部と鋼管
１外に位置する下端部とに取り付けられている撹拌器６
（以下、前者及び後者の各撹拌器をそれぞれ第１撹拌器
及び第２撹拌器と言う）のうち第２撹拌器の直径が鋼管
１の直径よりも大きい本発明装置を使用し、軟弱地盤Ａ
への挿入ピッチをこの第２撹拌器の直径よりも小さくす
ることにより、第１撹拌器により強化処理を行いながら
引き抜かれてゆく鋼管１の下端から出た強化処理済み軟
弱土を直ちに第２撹拌器により隣接する強化処理作業の
終えた場所の土砂と混合撹拌し、連続した強化処理済み
層を形成して連続壁或はブロック状の強化地盤とするこ
とができる。[Example of the method of the present invention using the device of the present invention]. An embodiment of improving soft ground on the ocean floor using the apparatus of the present invention having the above configuration will be described with reference to FIG. First, a work boat for soft ground improvement work is equipped with the device of the present invention, and the auger screw 2 is rotated (the agitator 6 is also rotated) at a predetermined location as shown in FIGS. The device of the present invention is inserted into soft ground A. At this time, a small amount of air is intermittently or continuously injected from the injection hole 3a to prevent the injection hole 3at'f from clogging. Also steel pipe 1
Adjust the rotational speed of the auger screw 2 and the insertion speed of the steel pipe 1 by the wire 15 (omitted in Fig. 5) so that the upper surface of the soft soil taken in is almost at the same level as the bottom ground surface. For example, the steel pipe 1 is inserted into the soft ground A without consolidating the soft soil taken into the steel pipe 1. In this way, as shown in FIG. 5(C), the steel pipe 1
When the tip of the auger screw 2 reaches the specified depth,
When the compressed air and assimilating agent are forced into the rotary shaft 3 from the press-in tube 9 and injected from the injection hole 3a while rotating the stirrer 6 in the opposite direction, the solidifying agent flows inside the steel pipe 1 near the upper end of the steel pipe 1. The soil is thoroughly mixed and stirred with the soft soil in the soil to undergo a strengthening treatment, and in this state the apparatus of the present invention itself is pulled out as shown in FIG. 5 (CI). The extraction of the device of the present invention is performed by lifting using the lifting force generated by the reverse rotation of the auger screw 2 and the extraction wire 15 pulled by a winch as necessary. By adjusting the upper surface l so that it is almost at the same level as the seabed ground surface, when the lower end of the steel pipe 1 leaves the seabed ground surface, as shown in Fig. 5(e), the strengthened ground portion B is The top surface and the surrounding seabed ground surface almost match. In the steel pipe 1 during the strengthening process, part of the solidifying agent that was not mixed with the soft soil and stirred is passed through the screw surface 4 mainly along the rotation axis 3 inside the steel pipe 1 together with the injected air. It rises while passing through the pores 4a, is collected in the upper cavity 12 in the steel pipe 1, and is discharged into the air exhaust pipe 11 with a filter.
After that, the solidifying agent is removed by a filter and the air is released into the atmosphere. In this way, Figure 5 (e
) When the strengthening process is completed at a predetermined location, the device of the present invention is further raised above the sea surface and moved above the next predetermined location as shown in FIG. is inserted into soft ground A to perform strengthening treatment. If the reinforcement treatment is performed as described above, the soft ground will be strengthened into a pile shape as shown in FIG. When attempting to improve soft ground △ into continuous wall or block-shaped reinforced ground, the lower end of the rotating shaft 3 of the auger screw 2 located inside the steel pipe 1 and the lower end located outside the steel pipe 1. Stirrer 6 attached to
(Hereinafter, the former and latter agitators are referred to as the first agitator and the second agitator, respectively), the diameter of the second agitator is larger than the diameter of the steel pipe 1.
By making the insertion pitch smaller than the diameter of the second stirrer, the reinforced soft soil that comes out from the lower end of the steel pipe 1, which is being pulled out while being strengthened by the first stirrer, is immediately stirred into the second stirrer. It can be mixed and stirred with earth and sand from an adjacent site where the reinforcement treatment work has been completed using a container to form a continuous reinforcement treatment layer to form a continuous wall or block-shaped reinforced ground.
このように本発明は、鋼管を軟弱地盤中に挿入してこの
鋼管内で強化処理を行って噴出された空気は鋼管内の上
方に集めて濾過してから大気中に放出することにより２
、粉塵公害や水質汚濁の発生は全くなく、又鋼管と回転
軸及びスクリュ面とが一体となった本発明装置を使用す
ることにより、大水深の場所においても装置の挿入は強
度的に充分余祐があり、且つ固化剤と軟弱土との混合撹
拌は極めて効果的・能率的で固化剤の使用量はより少量
で済み、経済的に軟弱地盤を強固ならしめることができ
る。In this way, the present invention inserts a steel pipe into soft ground, performs strengthening treatment within the steel pipe, and collects the ejected air above the steel pipe, filters it, and then releases it into the atmosphere.
There is no occurrence of dust pollution or water pollution, and by using the device of the present invention, which integrates the steel pipe, rotating shaft, and screw surface, the device can be inserted in places with sufficient strength even in deep water locations. The mixing and stirring of the solidifying agent and the soft soil is extremely effective and efficient, and the amount of the solidifying agent used can be reduced, making it possible to economically solidify the soft ground.
°−第１図は本発明装置の１実施例をその一部を切欠し
て示す側面説明図、第２図は第１図のＸ−Ｘ線断面説明
図、第３図（イ）、（ロ）及び（ハ）はそれぞれ第１図
のＹ−Ｙ線の位置かる見たときの撹拌翼の枚数を異にす
る撹拌器を示す説明図、第４図３（イ）及び（ロ）はそ
れぞれ撹拌翼の段数を異にする撹拌翼器を示す側面説明
図、第５図（ａ）〜（ｆ）は本発明方法の１実施例を工
程順に模式的に示す工程説明図である。
１・・・・鋼管
２・・・・オーガスクリュ
３・・・・回転軸 ３ａ・・・・噴射孔４・・・・スク
リュ面 ４ａ・・・・通気孔５・・・・軸受
６・・・・撹拌器
７・・・・撹拌翼
８・・・・駆動源
９・・・・圧入管
１０・・・・スイベルジヨイント
１１・・・・濾過器付空気排出管
１２・・・・上方空洞部
１３・・・・垂直移動手段
１４・・・・連結部
１５・・・・ワイヤ
１６・・・・リードパイプ
１７・・・・ガイド部
Ａ・・・・軟弱地盤
Ｂ・・・・強化処理済みの地盤部分
Ｄ・・・・甲板
し・・・・海底地盤面
ｌ・・・・鋼管内の軟弱土の上面
Ｐ・・・・シーブ
第１図 第２図
手続補正書 働式）
１．事件の表示
昭和５９年特許願第１１３８５７号
２、発明の名称
軟弱地盤の改良方法及び装置
３、補正をする者
事件どの関係 特許出願人
住 所 福岡県北九州市若松区浜町−丁目４番７＠名称
若築建設株式会社
代表取締役 阿 部 浩
４、 代 理 人 〒１００
住 所 東京都千代田区丸の内１−４−５永楽ビル２３
４号室 電話２１４−２８６４番（代）６、補正の対象
明細書の図面の簡単な説明の欄
７、補正の内容
昭和５９年６月５日付で提出致しました特許願に対し、
［１，明細書の図面の簡単な説明の欄を正確に記載した
書面。
（何を表わす図であるかの説明を記載のこと。） （第
５図の説明。）
（注）第５図の（ａ）〜（ｆ）は実線で結ばれているの
で分図とは認められない。第５図の抱括説明をすること
。Ｊ
なる旨の補正命令を受けました。
よって明細書中の第１５頁第１６行〜第１８行目の「第
５図（ａ）〜（ｆ）は本発明方法の１実施例を工程順に
模式的に示す工程説明図である。」とあるを
［第５図は本発明方法の１実施例の工程説明図であって
（ａ）〜（ｆ）はそれぞれ隣接した６個所で工程順に順
次ずれた段階で実施している状態を模式的に示す説明図
である。」と補正致し、ま“−す。
手続補正書
昭和５９年１２月２８日
特許庁長官 志 賀 学 殿
１、事件の表示
昭和５９年特許願第１１３８５７号
２、発明の名称
軟弱地盤の改良方法及び装置
３、補正をする者
事件との関係 特許出願人
住 所 福岡県北九州市若松区浜町−丁目４番７号名称
若築建設株式会社
代表取締役 阿 部 浩
４、 代 理 人 〒１００
住 所 東京都千代田区丸の内１−４−５１、補正の内
容
明細書中の第７頁第３行〜第５行目
［第５図（ａ）〜（ｆ）は本発明方法の１実施例を工程
順に模式的に、示す工程説明図である。」とあるを
「第５図は本発明方法の１実施例の工程説明図であって
（ａ）〜（ｆ）はそれぞれ隣接した６個所で工程順に順
次ずれた段階で実施している状態を模式的に示す説明図
である。」と補正致します。- Figure 1 is a partially cutaway side view of an embodiment of the device of the present invention, Figure 2 is a cross-sectional view taken along the line X--X of Figure 1, Figures 3 (A), ( (b) and (c) are explanatory diagrams showing agitators with different numbers of stirring blades when viewed from the position of the Y-Y line in Fig. 1, respectively, and Fig. 4 (a) and (b) are FIGS. 5(a) to 5(f) are explanatory side views showing stirring blades having different numbers of stages of stirring blades, and FIGS. 5(a) to 5(f) are step explanatory views schematically showing one embodiment of the method of the present invention in the order of steps. 1... Steel pipe 2... Auger screw 3... Rotating shaft 3a... Injection hole 4... Screw surface 4a... Ventilation hole 5... Bearing 6... ... Stirrer 7 ... Stirring blade 8 ... Drive source 9 ... Press-fit tube 10 ... Swivel joint 11 ... Air discharge pipe with filter 12 ... Upper part Cavity part 13... Vertical movement means 14... Connecting part 15... Wire 16... Lead pipe 17... Guide part A... Soft ground B... Strengthening Treated ground area D...Deck...Seafloor ground surface L...Top surface of soft soil inside the steel pipe P...Sheave Figure 1 Figure 2 Procedural Amendment Work Form) 1 ．． Display of the case 1982 Patent Application No. 113857 2 Name of the invention Method and device for improving soft ground 3 Person making the amendment Case relationship Patent applicant address Address 4-7 Hamamachi-chome, Wakamatsu-ku, Kitakyushu-shi, Fukuoka @ Name Wakachiku Construction Co., Ltd. Representative Director Hiroshi Abe 4, Agent 100 Address 23 Eiraku Building, 1-4-5 Marunouchi, Chiyoda-ku, Tokyo
Room 4 Telephone: 214-2864 (Main) 6, Column 7 for a brief explanation of the drawings of the specification subject to amendment, Contents of the amendment For the patent application submitted on June 5, 1980, [1, A document that accurately describes the brief description of the drawings in the specification. (Please write an explanation of what the diagram represents.) (Explanation of Figure 5.) (Note) Since (a) to (f) in Figure 5 are connected by solid lines, they are not divided diagrams. unacceptable. Give a comprehensive explanation of Figure 5. I received an amendment order to the effect of J. Therefore, in the specification, page 15, lines 16 to 18, ``Figures 5(a) to 5(f) are process explanatory diagrams schematically showing one embodiment of the method of the present invention in the order of steps.'' [Figure 5 is a process explanatory diagram of one embodiment of the method of the present invention, and (a) to (f) are schematic diagrams showing the state in which the process is carried out at six adjacent locations at sequentially shifted stages. FIG. ” Procedural amendment December 28, 1980 Manabu Shiga, Commissioner of the Patent Office 1. Indication of the case 1982 Patent Application No. 113857 2. Name of the invention Method for improving soft ground and Device 3, relationship with the case of the person making the amendment Patent applicant address: 4-7 Hamamachi-chome, Wakamatsu-ku, Kitakyushu-shi, Fukuoka Name: Wakachiku Construction Co., Ltd. Representative director: Hiroshi Abe 4, agent: 100 Address: 1-4-51 Marunouchi, Chiyoda-ku, Tokyo, page 7, lines 3 to 5 of the statement of contents of the amendment [Figures 5 (a) to (f) show the steps of one embodiment of the method of the present invention. FIG. This is an explanatory diagram that schematically shows the implementation at sequentially shifted stages.''
Claims (1)
撹拌する強化処理を行うことによって軟弱地盤を強化す
るに当り、鋼管を該鋼管内に取り込まれる軟弱土を圧密
させない状態として軟弱地盤の所定深さまで挿入した後
、該鋼管を引き抜きつつ該鋼管内に取り込まれている軟
弱土を撹拌器を使用して強化処理し且つ噴射された空気
は鋼管内の上方空洞部に集めて濾過して放出することを
特徴とする軟弱地盤の改良方法。 ２ 外殻を構成する鋼管と、該鋼管内に回転自在に貫挿
されており該鋼管内に位置する下端部に噴射孔を有する
中空の回転軸外周に螺旋状に固設されているスクリュ面
に１周当り１個以上の通気孔を回転軸の軸方向に有する
オーガスクリュと、該鋼管の下端部に位置する上記オー
ガスクリュの回転軸の下端部近傍に１枚以上の撹拌翼が
１段以上取り付けられて成る撹拌器と、鋼管の頭部に設
置されていて上記オーガスクリュの回転軸を正逆いずれ
にも回転せしめ得る駆動源と、鋼管内の上方でオーガス
クリュの回転軸の中空部に連通して取り付けられており
固化剤及び圧縮空気を圧入するための圧入管と、鋼管内
の上方に形成される上方空洞部に連通ずる濾過器付空気
排出管と、鋼管外壁に取り付けられた垂直移動手段とか
ら成ることを特徴とする軟弱地盤の改良装置。 ３ 撹拌器がオーガスクリュの回転軸の鋼管内に位置す
る下端部に取り付けられている特許請求の範囲第２項に
記載の軟弱地盤の改良装置− ４撹拌器がオーガスクリュの回転軸の鋼管内に位置する
下端部と鋼管外に位置する下端部とに取り付けられてい
る特許請求の範囲第２項に記載の軟弱地盤の改良装置。[Scope of Claims] 1. In strengthening the soft ground by performing a strengthening treatment in which a solidifying agent is injected into the soft ground together with compressed air and mixed and stirred, the steel pipe does not consolidate the soft soil that is taken into the steel pipe. After inserting the steel pipe to a predetermined depth into the soft ground, the steel pipe is pulled out and the soft soil taken into the steel pipe is strengthened using a stirrer, and the injected air flows into the upper cavity inside the steel pipe. A method for improving soft ground characterized by collecting, filtering, and discharging. 2. A steel pipe constituting the outer shell, and a screw surface that is rotatably inserted into the steel pipe and fixed in a helical manner to the outer periphery of a hollow rotating shaft that has an injection hole at the lower end located inside the steel pipe. an auger screw having one or more ventilation holes per revolution in the axial direction of the rotating shaft, and one or more stirring blades in one stage near the lower end of the rotating shaft of the auger screw located at the lower end of the steel pipe. The above-mentioned agitator, a drive source installed at the head of the steel pipe and capable of rotating the rotation shaft of the auger screw in both forward and reverse directions, and a hollow portion of the rotation shaft of the auger screw located above the steel pipe. A press-in pipe for press-fitting the solidifying agent and compressed air, which is connected to and attached to the steel pipe, an air exhaust pipe with a filter that communicates with the upper cavity formed in the upper part of the steel pipe, and an air discharge pipe attached to the outer wall of the steel pipe. A device for improving soft ground, comprising a vertical movement means. 3. The soft ground improvement device according to claim 2, wherein the agitator is attached to the lower end of the steel pipe of the rotating shaft of the auger screw. The soft ground improvement device according to claim 2, which is attached to a lower end portion located in the steel pipe and a lower end portion located outside the steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11385784A JPS60258320A (en) | 1984-06-05 | 1984-06-05 | Method and device of improving soft ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11385784A JPS60258320A (en) | 1984-06-05 | 1984-06-05 | Method and device of improving soft ground |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60258320A true JPS60258320A (en) | 1985-12-20 |
| JPH0468405B2 JPH0468405B2 (en) | 1992-11-02 |
Family
ID=14622813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11385784A Granted JPS60258320A (en) | 1984-06-05 | 1984-06-05 | Method and device of improving soft ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60258320A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62164912A (en) * | 1986-01-17 | 1987-07-21 | Nippon Sharyo Seizo Kaisha Ltd | Method and apparatus for improving ground under water |
| JPH02221512A (en) * | 1989-02-23 | 1990-09-04 | Shohei Senda | Method and apparatus for modifying weak ground |
| JPH03125712A (en) * | 1989-10-12 | 1991-05-29 | Shohei Senda | Poor subsoil improvement method and device |
| JP2011132718A (en) * | 2009-12-24 | 2011-07-07 | Onoda Chemico Co Ltd | Soil improving device and soil improvement method by use of the same |
| JP2016188520A (en) * | 2015-03-30 | 2016-11-04 | 株式会社不動テトラ | Ground improvement method by using special multiple pipe |
| JP2016217066A (en) * | 2015-05-25 | 2016-12-22 | 株式会社テノックス九州 | Excavation agitation device |
| JP2022013447A (en) * | 2020-07-03 | 2022-01-18 | Ｊｆｅスチール株式会社 | Water bottom ground improvement method |
| JP2022025061A (en) * | 2020-07-03 | 2022-02-09 | Ｊｆｅスチール株式会社 | Submarine ground improvement system |
| CN114164832A (en) * | 2021-11-30 | 2022-03-11 | 深圳市蛇口招商港湾工程有限公司 | Soft soil reinforcing structure below throwing filling block stone layer and construction method |
-
1984
- 1984-06-05 JP JP11385784A patent/JPS60258320A/en active Granted
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62164912A (en) * | 1986-01-17 | 1987-07-21 | Nippon Sharyo Seizo Kaisha Ltd | Method and apparatus for improving ground under water |
| JPH02221512A (en) * | 1989-02-23 | 1990-09-04 | Shohei Senda | Method and apparatus for modifying weak ground |
| JPH03125712A (en) * | 1989-10-12 | 1991-05-29 | Shohei Senda | Poor subsoil improvement method and device |
| JP2011132718A (en) * | 2009-12-24 | 2011-07-07 | Onoda Chemico Co Ltd | Soil improving device and soil improvement method by use of the same |
| JP2016188520A (en) * | 2015-03-30 | 2016-11-04 | 株式会社不動テトラ | Ground improvement method by using special multiple pipe |
| JP2016217066A (en) * | 2015-05-25 | 2016-12-22 | 株式会社テノックス九州 | Excavation agitation device |
| JP2022013447A (en) * | 2020-07-03 | 2022-01-18 | Ｊｆｅスチール株式会社 | Water bottom ground improvement method |
| JP2022025061A (en) * | 2020-07-03 | 2022-02-09 | Ｊｆｅスチール株式会社 | Submarine ground improvement system |
| CN114164832A (en) * | 2021-11-30 | 2022-03-11 | 深圳市蛇口招商港湾工程有限公司 | Soft soil reinforcing structure below throwing filling block stone layer and construction method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0468405B2 (en) | 1992-11-02 |
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