JPH0468405B2 - - Google Patents
Info
- Publication number
- JPH0468405B2 JPH0468405B2 JP11385784A JP11385784A JPH0468405B2 JP H0468405 B2 JPH0468405 B2 JP H0468405B2 JP 11385784 A JP11385784 A JP 11385784A JP 11385784 A JP11385784 A JP 11385784A JP H0468405 B2 JPH0468405 B2 JP H0468405B2
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- soft ground
- rotating shaft
- soft
- auger screw
- 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
- 229910000831 Steel Inorganic materials 0.000 claims description 76
- 239000010959 steel Substances 0.000 claims description 76
- 239000003795 chemical substances by application Substances 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 26
- 239000002689 soil Substances 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 23
- 238000005728 strengthening Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000002002 slurry Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 206010001497 Agitation Diseases 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005086 pumping 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
本発明は固化剤と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攪拌する強化処
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。
The present invention performs a strengthening process in which the solidifying agent and compressed air are injected into the soft ground to mix and stir the solidifying agent and the soft soil in a steel pipe inserted into the soft ground, thereby preventing the solidifying agent from scattering 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、軟弱土と固
化剤のスラリーとを混合攪拌することによつて化
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固化剤のスラリー
として水を多量に注入することになるため、軟弱
地盤が盛り上つたり、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固化
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攪拌することによつて軟弱地
盤を強化する噴射攪拌方法が実施されるようにな
つた。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
ツサ等の汎用性のある小規模な設備で足りるなど
の利点をもたらした。
As one of the land improvement methods for soft ground, a slurry of solidifying agents such as cement and lime has been injected through a hollow pipe inserted into the soft ground, and the soft soil and the slurry of solidifying agents are mixed and stirred. A deep mixing treatment method was used to chemically strengthen soft soil. However, this method requires a large amount of water to be injected as a solidifying agent slurry into the soft ground, which already has a high moisture content, which may cause the soft ground to heave up or increase the required ground strength. This method had major disadvantages such as requiring an extra amount of solidifying 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 slurry of solidifying agent, this method eliminates the heaving of the ground by letting most of the air used as the injection medium escape into the atmosphere, and also injects excess water into soft ground. The amount of solidifying agent used can be reduced because there is no need to do anything, and in addition, there is no need for large-scale equipment for mixing and pumping the solidifying agent such as cement and water, which is required in the deep mixing treatment method. This has the advantage of requiring small-scale, versatile equipment such as measuring instruments and compressors.
しかしながらこの噴射攪拌処理方法では、噴射
された固化剤の一部が空気と共に地盤中を通つて
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攪
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つた。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, some of the injected solidifying 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 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 had 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つ
て、軟弱地盤中に固化剤を圧縮空気と共に噴射し
て混合攪拌する強化処理を行うことによつて軟弱
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攪拌器を
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。又本発明の他の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
あつて、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ユ面に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ユ
と、該鋼管の下端部に位置する上記オーガスクリ
ユの回転軸の下端部近傍に１枚以上の攪拌翼が１
段以上取り付けられて成る攪拌器と、鋼管の頭部
に設置されていて上記オーガスクリユの回転軸を
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ユ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
上方空洞部に連通す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攪拌翼の枚数を異
にする攪拌器を示す説明図、第４図イ及びロはそ
れぞれ攪拌翼の段数を異にする攪拌器を示す側面
説明図、第５図は本発明方法の１実施例の工程説
明図であつて(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。
That is, one of the present inventions relates to a method for improving soft ground in order to solve the above-mentioned problems, which involves performing a strengthening treatment by injecting a solidifying agent into the soft ground together with compressed air and mixing and stirring. When strengthening soft ground, a 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 stirred while being pulled out. It is characterized in that the air that is strengthened using a container and injected is collected in the upper cavity of the steel pipe, filtered, and then released. Another aspect of the present invention relates to a soft ground improvement device for solving the above-mentioned problems, which includes a steel pipe constituting 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 rotary shaft on the screw surface fixed in a spiral manner on the outer periphery of a hollow rotary shaft having an injection hole at the lower end thereof located inside; and the steel pipe. One or more stirring blades are installed near the lower end of the rotating shaft of the auger screw located at the lower end.
an agitator installed in multiple stages; a drive source installed at the head of the steel pipe that can rotate the auger screw's rotating shaft in either forward or reverse directions; A press-in pipe for press-fitting the solidifying agent and compressed air that is connected and installed, an air exhaust pipe with a filter that communicates with the upper cavity formed above the steel pipe, and a vertically movable pipe that is installed on the outer wall of the steel pipe. It is characterized by consisting of means. 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, Fig. 2 is a cross-sectional view taken along the line X-X of Fig. 1, and Fig. 3 A, B, and C are respective views. Explanatory diagrams showing agitators with different numbers of stirring blades when viewed from the position of the Y-Y line in Figure 1, Figure 4 A and B are side views showing agitators with different numbers of stirring blades, respectively. The explanatory diagram and FIG. 5 are process explanatory diagrams of one embodiment of the method of the present invention, and (a) to (f) each schematically shows the state in which the process is carried out at six adjacent locations at sequentially shifted stages. FIG.
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
行つていたのに対し、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固化剤を
圧縮空気と共に鋼管内に噴射して軟弱土と混合攪
拌するのであるが、この混合攪拌を鋼管の周壁で
囲まれた狭い空間内で攪拌器を使用して行うこと
により混合攪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
かつ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 the conventional method for improving soft ground, reinforcement treatment was carried out in an open state without installing any partition walls in the continuous soft ground, whereas the method of the present invention involves inserting steel pipes into the soft ground. The steel pipe undergoes a strengthening process, and the ejected air is collected above the steel pipe, filtered, and then released into the atmosphere. When inserting a steel pipe into soft ground, the soft soil taken into the steel pipe is not consolidated, and after reaching a predetermined depth, the steel pipe is pulled out and strengthened by injecting a solidifying agent into the steel pipe together with compressed air to weaken the soft soil. Mixing and stirring with the soil is extremely effective when this mixing and stirring is carried out using a stirrer in a narrow space surrounded by the peripheral wall of a steel pipe. A small amount of the injected air dissolves in water or is adsorbed in 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.
【本発明装置の構成】
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
つて、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はオーガスクリユであ
つて回転軸３とスクリユ面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する噴射孔３ａを有
している。スクリユ面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つて螺旋状
に固設されている。このスクリユ面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。スクリユ面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に沿つ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
とを混合攪拌するための攪拌器であつて、鋼管１
の下端部に位置するオーガスクリユ２の回転軸３
の下端部近傍に１枚以上の攪拌翼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
ハはそれぞれ攪拌翼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攪拌翼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段の攪拌翼７から成る攪
拌器６が２個取り付けられているものである。こ
のような攪拌器６は、オーガスクリユ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は駆動源であつて鋼管１の頭部に設置さ
れてオーガスクリユ２の回転軸３に連結されてお
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ユ２の回転軸
３の中空部に圧入するための圧入管であつて、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
つて鋼管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
垂直移動手段であつて、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インチ（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１
６によりガイドされるガイド部１７とから成る。
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Ｄ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。[Configuration of the Apparatus of the Present Invention] Next, an apparatus of the present invention suitable for carrying out the method of the present invention will be described with reference to FIGS. 1 to 4. In the drawings, reference numeral 1 denotes a steel pipe in which reinforcement treatment is performed, the upper end of which is closed and the lower end of which is 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 has a hollow portion inside for passing compressed air and a solidifying agent, and has a lower end located inside the steel pipe 1. It has an injection hole 3a communicating with the hollow part. The screw surface 4 is fixed to the outer periphery of the rotating shaft 3 in a spiral shape from a position near the lower end of the steel pipe 1 upward. The height from the lower end to the upper end of this screw surface 4 may be at least the 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). 6 is a stirrer for mixing and stirring the soft soil and the solidification agent;
Rotating shaft 3 of the auger screw 2 located at the lower end of the
One or more stirring blades 7 are attached in one or more stages near the lower end of the stirring blade. Figure 3 A, B and C show cases where the number of stirring blades 7 is one, two and three, respectively, and Figure 4 A and B show the case where the number of stirring blades 7 is 7, respectively.
The figure shows the case where the is attached to the 1st and 2nd tier. In the embodiment shown in FIG. 1, two stirrers 6 each having one stage of stirring blades 7 are attached. It is preferable for such an agitator 6 to be 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. It may also be attached to the lower end located outside the steel pipe 1 as shown in Fig. 1, and in this case, in order to mix the soft soil that has been reinforced inside the steel pipe 1 with the earth and sand around the outside of the steel pipe. It is preferable to have a diameter larger than the outer diameter of the steel pipe 1. 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 forward or reverse directions by hydraulic or electric power. Reference numeral 9 denotes a press-fitting pipe for press-fitting a solidifying agent and compressed air into the hollow part of the rotating shaft 3 of the auger screw 2, which communicates with the hollow part of the rotating shaft 3 at the upper part of the steel pipe 1 and is connected to the hollow part of the rotating shaft 3 by, for example, a swivel joint 10. It is attached to the rotating shaft 3. Reference numeral 11 denotes an air exhaust pipe with a filter, which communicates with an upper cavity part 12 formed above the steel pipe 1, through which solidifying agent-containing air that rises from below inside the steel pipe 1 and is collected in the upper cavity part 12. is released into the atmosphere through a filter (not shown). In order to enhance this effect, the filtered air exhaust pipe 11 may be connected to a suction device (not shown). Reference numeral 13 denotes a vertical movement means attached to the outer wall of the steel pipe 1, which includes a wire 15 that is normally connected to the outer wall of the steel pipe 1 via a connecting portion 14 and is pulled vertically by a winch (not shown) or the like.
and a lead pipe 1 fixed to maintain the moving direction vertically when the steel pipe 1 is moved vertically.
and a guide portion 17 guided by 6.
In Fig. 1, two wires are shown: a wire 15 for pulling upwards and a wire 15 for pulling downwards through a sheave P fixed to the deck D of a work boat.
Wire 15 for pulling downward when inserting
is unnecessary.
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ユ２を回転（攪拌器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３ａが目詰りしない
ように断続的に又連続的に少量の空気を噴射孔３
ａ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ｌが回転地盤面Ｌとほぼ同じレベルと
なるようにオーガスクリユ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
ーガスクリユ２と攪拌器６とを逆回転させながら
圧縮空気と固化剤とを圧入管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内の下端部付近にある軟弱土と
充分に混合攪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ｄ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
ーガスクリユ２の逆回転による上昇力と必要に応
じてウイ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Ｌ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Ｌ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Ｌ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
共に軟弱土と混合攪拌されなかつた一部の固化剤
は、噴射された空気と共に鋼管１内を主として回
転軸３に沿つてスクリユ面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つて大気中へ放
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Ａを連続壁或はブロツク状の強化地盤に
改良しようとするときは、オーガスクリユ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攪拌器６
（以下、前者及び後者の各攪拌器をそれぞれ第１
攪拌器及び第２攪拌器と言う）のうち第２攪拌器
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への挿入ピツチをこの第２攪
拌器の直径よりも小さくすることにより、第１攪
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攪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攪拌し、連続した強化処理
済み層を形成して連続壁或はブロツク状の強化地
盤とすることができる。
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 was equipped with the device of the present invention, and the device was installed at a predetermined location in Figure 5 a and b.
As shown in the figure, the device of the present invention is inserted into the soft ground A while rotating the auger screw 2 (the agitator 6 also rotates). At this time, in order to prevent the injection holes 3a from clogging, a small amount of air is intermittently or continuously supplied to the injection holes 3a.
Inject from a. In addition, 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) are adjusted so that the upper surface l of the soft soil taken into the steel pipe 1 is approximately at the same level as the rotating ground surface L. Then, the steel pipe 1 can be inserted into the soft ground A without consolidating the soft soil taken into the steel pipe 1. In this way, when the tip of the steel pipe 1 reaches a predetermined depth as shown in FIG. When the solidifying agent is press-fitted into the steel pipe 1 and injected from the injection hole 3a, the solidifying agent is sufficiently mixed and stirred with the soft soil near the lower end of the steel pipe 1, and a strengthening process is performed.
In this state, the device of the present invention itself is pulled out as shown in FIG. 5d. The pulling out of the device of the present invention is carried out by lifting using the lifting force generated by the reverse rotation of the auger screw 2 and the pulling wire 15 pulled by a winch as necessary. By adjusting l so that it is approximately at the same level as the seabed ground level L,
When the lower end of the steel pipe 1 leaves the seabed ground surface L as shown in FIG.
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 rotating shaft 3 inside the steel pipe 1 together with the injected air. The air rises while passing through the pores 4a, is collected in the upper cavity 12 in the steel pipe 1, passes through the air discharge pipe 11 with a filter, and is released into the atmosphere as air from which the solidifying agent has been removed by the filter. be. In this way, when the strengthening process is completed at a predetermined location as shown in FIG. 5e, the device of the present invention is further raised above the sea surface and moved above the next predetermined location as shown in FIG. 5f. Similarly, the device of the present invention is inserted into soft ground A to carry out 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. If,
When trying to improve the soft ground A into a continuous wall or block-shaped reinforced ground, it is necessary to attach the lower end of the rotating shaft 3 of the auger screw 2 to the lower end located inside the steel pipe 1 and the lower end located outside the steel pipe 1. Stirrer 6
(Hereinafter, each of the former and latter stirrers will be
The diameter of the second stirrer (referred to as the stirrer and the second stirrer) is larger than the diameter of the steel pipe 1, and the insertion pitch into the soft ground A is set to be smaller than the diameter of the second stirrer. By making the size smaller, the strengthened 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 agitator, is immediately combined with the soil and sand in the adjacent place where the strengthening treatment has been completed by the second agitator. By mixing and stirring, a continuous reinforced layer can be formed 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つて噴出された空
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、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ユ面とが
一体となつ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
分余裕があり、且つ固化剤と軟弱土との混合攪拌
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化ならしめる
ことができる。
In this way, the present invention removes dust by inserting a steel pipe into soft ground, performing strengthening treatment within the steel pipe, collecting the ejected air above the steel pipe, filtering it, and then releasing it into the atmosphere. There is no pollution or water pollution, and by using the device of the present invention, in which the steel pipe, rotating shaft, and screw surface are integrated,
There is sufficient strength to insert the device even in deep water locations, and mixing and stirring of the solidifying agent and soft soil is extremely effective and efficient, requiring less solidifying agent, making it economical. It can strengthen and strengthen 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攪拌翼の枚
数を異にする攪拌器を示す説明図、第４図イ及び
ロはそれぞれ攪拌翼の段数を異にする攪拌翼器を
示す側面説明図、第５図は本発明方法の１実施例
の工程説明図であつてａ〜ｆはぞれぞれ隣接した
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。
１……鋼管、２……オーガスクリユ、３……回
転軸、３ａ……噴射孔、４……スクリユ面、４ａ
……通気孔、５……軸受、６……攪拌器、７……
攪拌翼、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、Ｌ……海底地盤面、ｌ……鋼管内の軟弱土の
上面、Ｐ……シーブ。
FIG. 1 is a partially cutaway side explanatory view showing one embodiment of the device of the present invention, and FIG. 2 is an X-X in FIG. 1.
Line cross-sectional explanatory diagrams, 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 Figure 1, and Figures 4 A and C, respectively. B is an explanatory side view showing stirring blades having different numbers of stages of stirring blades, and FIG. FIG. 2 is an explanatory diagram schematically showing a state in which the steps are performed at sequentially shifted steps in the order of the steps. 1... Steel pipe, 2... Auger screw, 3... Rotating shaft, 3a... Injection hole, 4... Screw surface, 4a
...Vent hole, 5... Bearing, 6... Stirrer, 7...
Stirring blade, 8... Drive source, 9... Press-fit pipe, 10...
Swivel joint, 11...Air discharge pipe with filter, 12...Upper cavity, 13...Vertical movement means, 14...Connection part, 15...Wire, 16...
Lead pipe, 17...Guide part, A...Soft ground, B...Reinforced ground portion, D...Deck, L...Seafloor ground surface, l...Top surface of soft soil inside steel pipe, P... …Sheeb.
Claims (1)
て混合攪拌する強化処理を行うことによつて軟弱
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攪拌器を
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
れているスクリユ面に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ユと、該
鋼管の下端部に位置する上記オーガスクリユの回
転軸の下端部近傍に１枚以上の攪拌翼が１段以上
取り付けられて成る攪拌器と、鋼管の頭部に設置
されていて上記オーガスクリユの回転軸を正逆い
ずれにも回転せしめ得る駆動源と、鋼管内の上方
でオーガスクリユ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
空洞部に連通す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 攪拌器がオーガスクリユ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 攪拌器がオーガスクリユ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。[Claims] 1. In strengthening the soft ground by injecting a solidifying agent into the soft ground together with compressed air and mixing and stirring, the steel pipe is used to strengthen the soft soil that is taken into the steel pipe. After the steel pipe is inserted to a predetermined depth in soft ground without being consolidated, 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 of the steel pipe. A method for improving soft ground, which is characterized by collecting it in a portion, filtering it, and discharging it. 2. A steel pipe constituting the outer shell, and a screw surface that is rotatably inserted into the steel pipe and fixed in a spiral 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 stages of one or more stirring blades are installed near the lower end of the rotating shaft of the auger screw located at the lower end of the steel pipe. a drive source installed at the head of the steel pipe and capable of rotating the rotating shaft of the auger screw in either forward or reverse directions; A press-in pipe is attached to press-fit a solidifying agent and compressed air, an air discharge pipe with a filter is connected to an upper cavity formed in the upper part of the steel pipe, and a vertical moving means is attached to the outer wall of the steel pipe. A soft ground improvement device characterized by comprising: 3. The soft ground improvement device according to claim 2, wherein the agitator is attached to the lower end of the rotating shaft of the auger screw located inside the steel pipe. 4. The soft ground improvement device according to claim 2, wherein the agitator is attached to the lower end of the rotating shaft of the auger screw located inside the steel pipe and the lower end 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 JPS60258320A (en) | 1985-12-20 |
| JPH0468405B2 true 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) |
Families Citing this family (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 |
| JP5036800B2 (en) * | 2009-12-24 | 2012-09-26 | 小野田ケミコ株式会社 | Ground improvement method |
| JP6490475B2 (en) * | 2015-03-30 | 2019-03-27 | 株式会社不動テトラ | Ground improvement method using special multiple pipes. |
| JP6419645B2 (en) * | 2015-05-25 | 2018-11-07 | 株式会社テノックス九州 | Drilling stirrer |
| JP6936456B1 (en) * | 2020-07-03 | 2021-09-15 | Ｊｆｅスチール株式会社 | Underwater ground improvement method |
| JP7002735B1 (en) * | 2020-07-03 | 2022-01-24 | Ｊｆｅスチール株式会社 | Underwater ground improvement equipment |
| CN114164832B (en) * | 2021-11-30 | 2023-07-14 | 深圳市蛇口招商港湾工程有限公司 | Soft soil reinforcing structure under polished filling block stone layer and construction method |
-
1984
- 1984-06-05 JP JP11385784A patent/JPS60258320A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60258320A (en) | 1985-12-20 |
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