JP6419645B2 - Drilling stirrer - Google Patents
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- JP6419645B2 JP6419645B2 JP2015105449A JP2015105449A JP6419645B2 JP 6419645 B2 JP6419645 B2 JP 6419645B2 JP 2015105449 A JP2015105449 A JP 2015105449A JP 2015105449 A JP2015105449 A JP 2015105449A JP 6419645 B2 JP6419645 B2 JP 6419645B2
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Description
本発明は、深層混合処理工法などの地盤改良工法に使用される掘削撹拌装置に関するものである。 The present invention relates to an excavation and agitation apparatus used in ground improvement methods such as deep mixing treatment methods.
地盤改良工法では、地中で固化材ミルクを加えながら、土を混練するので、混練土は一般に膨張する。逆に、混練土の膨張は、固化材ミルクを注入するための必要条件でもある。改良体の品質を向上させるには、固化材ミルクを吐出しながら撹拌翼を下降させ、撹拌翼の上昇時だけでなく下降時にも撹拌効果を発揮することが望ましい。 In the ground improvement method, since the soil is kneaded while adding the solidifying material milk in the ground, the kneaded soil generally expands. Conversely, the expansion of the kneaded soil is also a necessary condition for pouring the solidified milk. In order to improve the quality of the improved body, it is desirable to lower the stirring blade while discharging the solidified milk and to exert the stirring effect not only when the stirring blade is raised but also when it is lowered.
地中では、混練土に、土被り圧、側圧等の拘束圧が作用しており、深度が大きくなると、拘束圧が非常に高くなることがある。 In the ground, confining pressure such as earth covering pressure and lateral pressure acts on the kneaded soil, and the confining pressure may become very high as the depth increases.
拘束圧が高くなると、混練土に固化材ミルクが入る余地がなくなり、本来、混練土に入るべき固化材ミルクが、行き場を失って、例えば回転軸付近に沿って上昇し地上にリークする場合もある。このようになると、改良体内の固化材ミルクの濃度が低下して、改良体の品質が著しく損なわれることになる。 When the restraint pressure increases, there is no room for the solidified milk to enter the kneaded soil, and the solidified milk that should originally enter the kneaded soil loses its place, for example, rises along the vicinity of the rotation axis and leaks to the ground. is there. If it becomes like this, the density | concentration of the solidification material milk in an improved body will fall, and the quality of an improved body will be impaired remarkably.
特許文献１（特開２０１３−１６７１３９号公報）、特許文献２（特開平１０−２１２７２４号公報）及び特許文献３（特開２０００−２１２９５０号公報）に記載の技術は、本発明に似ているかのように見えるが、撹拌翼が下降する工程では固化材ミルクが吐出しないことが前提となっており、スクリューは固化材ミルクを含まない土砂を排出するものである。このようにすると、撹拌効果が不足して改良体の品質向上が困難となる。一方、本発明のように固化材ミルクを吐出しながら撹拌翼を下降させる技術によると、撹拌翼の上昇時だけでなく下降時にも撹拌効果を発揮して品質を向上できる一方、高い拘束圧の下、固化材ミルクの注入が困難となりやすい。
そこで本発明は、混練土に作用する拘束圧が上昇しても、固化材ミルクを混練土に注入しやすくできる掘削撹拌装置を提供することを目的とする。 Therefore, an object of the present invention is to provide an excavating and stirring device that can easily inject the solidified milk into the kneaded soil even when the restraining pressure acting on the kneaded soil increases.
第１の発明に係る掘削撹拌装置は、地中で回転する回転軸と、回転軸の下端部に突設され土砂を掘削する掘削翼と、回転軸において掘削翼よりも所定距離だけ上方に設けられ、回転軸を周回し回転軸に対して遊嵌されるボス部を有し、先端部が地山に接触する共回り防止翼と、共回り防止翼よりも上方において回転軸に設けられる撹拌翼と、共回り防止翼よりも上方において回転軸に設けられ、かつ掘削翼の進行方向とは逆向きに土砂を運搬するスクリュー本体と、回転軸に対して回転自在に支持され、かつスクリュー本体を包囲する案内筒と、案内筒から外向きに突出し、地山に接触する回り止め板とを有する。 According to a first aspect of the present invention, there is provided an excavating and agitating apparatus provided with a rotating shaft that rotates in the ground, an excavating blade that protrudes from a lower end portion of the rotating shaft and excavates earth and sand, and a predetermined distance above the excavating blade on the rotating shaft. A rotating wing that circulates around the rotating shaft and has a boss part loosely fitted to the rotating shaft, the tip of which is in contact with the natural ground, and a stirring provided on the rotating shaft above the anti-rotating blade. A screw body that is provided on the rotating shaft above the blade and the co-rotation preventing blade and that transports earth and sand in a direction opposite to the traveling direction of the excavating blade; and a screw body that is rotatably supported with respect to the rotating shaft. And a rotation stopper plate that protrudes outward from the guide tube and contacts the natural ground.
望ましくは、回転軸の直径をＤ１とし、スクリューの外径をＤ２とし、案内筒の内径をＤ３とし、案内筒の外径をＤ４とし、掘削翼の外径をＤ５とし、共回り防止翼の外径をＤ６とし、回り止め板の外径をＤ７とすると、Ｄ６＞Ｄ５＞Ｄ４＞Ｄ３＞Ｄ２＞Ｄ１及びＤ７＞Ｄ５を満たすようにする。 Desirably, the diameter of the rotating shaft is D1, the outer diameter of the screw is D2, the inner diameter of the guide cylinder is D3, the outer diameter of the guide cylinder is D4, the outer diameter of the excavating blade is D5, When the outer diameter is D6 and the outer diameter of the rotation stopper plate is D7, D6> D5> D4> D3> D2> D1 and D7> D5 are satisfied.
この構成において、回転軸が回転すると、掘削翼及びスクリュー本体は回転するが、共回り防止翼と回り止め板（即ち、案内筒）とは、先端部が地山に接触しているため、ほとんど回転しない。特に、殆ど静止している案内筒の内部をスクリュー本体が回転することにより、スクリュー本体と案内筒との間に存在する土砂に十分な摩擦力が作用して土砂を容易に運搬できる状態となる。 In this configuration, when the rotating shaft rotates, the excavation blade and the screw body rotate. However, since the tip of the co-rotation prevention blade and the rotation prevention plate (that is, the guide tube) is in contact with the natural ground, Does not rotate. In particular, when the screw main body rotates inside the guide cylinder that is almost stationary, sufficient frictional force acts on the earth and sand existing between the screw main body and the guide cylinder so that the earth and sand can be easily transported. .
掘削翼が地中を下向きに掘り進む場合、スクリュー本体と案内筒との間に存在する土砂であり固化材ミルクを含むものは、スクリュー本体により、逆方向（上向き）に運搬される。その結果、掘削翼が掘削する混練土の上部（固化材ミルクを含む）が、掘削翼の進行方向とは逆方向（上向き）に持ち上げられることとなり、混練土に作用する拘束圧が緩和される。即ち、実質的な拘束圧が低くなり、混練土に固化材ミルクをスムーズに注入できる。したがって、固化材ミルクが、行き場を失って上昇し地上にリークするような事態を回避することができる。要するに、改良体内の固化材ミルクの量を所望の程度に維持して、改良体の品質を高く保持することができる。 When the excavating blades dig downward in the ground, the earth and sand existing between the screw body and the guide tube and containing the solidified milk is transported in the reverse direction (upward) by the screw body. As a result, the upper part (including the solidified milk) of the kneaded soil excavated by the excavating blade is lifted in the direction opposite to the traveling direction of the excavating blade (upward), and the restraining pressure acting on the kneaded soil is relieved. . That is, the substantial restraint pressure is lowered, and the solidified milk can be smoothly poured into the kneaded soil. Therefore, it is possible to avoid a situation in which the solidified milk loses its place and rises and leaks to the ground. In short, the amount of the solidified milk in the improved body can be maintained at a desired level, and the quality of the improved body can be kept high.
逆に、掘削翼が地中を上向きに移動する場合、スクリュー本体と案内筒との間に存在する土砂は、スクリュー本体により、逆方向（下向き）に運搬されることとなり、土砂は改良体内に埋め戻されることになり、改良体内の密度を向上することができる。この点でも、改良体の品質を改善することができる。 Conversely, when the excavating blade moves upward in the ground, the earth and sand that exist between the screw body and the guide tube will be transported in the opposite direction (downward) by the screw body, and the earth and sand will enter the improved body. It will be backfilled and the density in the improved body can be increased. Also in this respect, the quality of the improved body can be improved.
本発明によれば、掘削翼が掘削する混練土に作用する拘束圧が高い場合であっても、スクリュー本体が掘削翼の進行方向とは逆向きに固化材ミルクを含む土砂を運搬するため、拘束圧を緩和して、固化材ミルクのリークを回避し、改良体の品質を高く保持できる。しかも、スクリュー本体は、地中でほとんど静止している案内筒で包囲されているため、案内筒とスクリュー本体とに挟まれる土砂を確実に、拘束圧を低減する向きに運搬できる。 According to the present invention, even when the confining pressure acting on the kneaded soil excavated by the excavating blade is high, the screw body carries the earth and sand containing the solidified milk in the direction opposite to the traveling direction of the excavating blade. The restraint pressure can be relaxed to avoid the leakage of the solidified milk, and the quality of the improved body can be kept high. In addition, since the screw body is surrounded by a guide tube that is almost stationary in the ground, the earth and sand sandwiched between the guide tube and the screw body can be reliably transported in a direction that reduces the restraint pressure.
また、掘削翼を地中から地上へ上昇させる際にも、スクリュー本体による土砂の埋め戻し効果が奏され、改良体の品質を改善できる。 In addition, when raising the excavating blade from the ground to the ground, the effect of backfilling the earth and sand by the screw main body is exerted, and the quality of the improved body can be improved.
（実施の形態１）
以下図面を参照しながら、本発明の実施の形態を説明する。図１（ａ）〜図１（ｃ）は、本発明の実施の形態１における地盤改良機の動作説明図である。
(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. Fig.1 (a)-FIG.1 (c) are operation | movement explanatory drawings of the ground improvement machine in Embodiment 1 of this invention.
まず、図１（ａ）に示すように、地面Ｇ上を走行するベースマシン１のリーダ２を起立させ、オーガモータ３がリーダ２の上方に位置する状態で、掘削撹拌装置４の上端部をオーガモータ３に接続する。そして、掘削撹拌装置４の下端部を地面Ｇと接触させる。 First, as shown in FIG. 1 (a), the leader 2 of the base machine 1 traveling on the ground G is erected, and the auger motor 3 is positioned above the leader 2, and the upper end of the excavating and agitating device 4 is moved to the auger motor. Connect to 3. And the lower end part of the excavation stirring apparatus 4 is made to contact the ground G.
次に、地面Ｇより空堀深さＨ１までは単純に土砂を掘り、空堀深さＨ１に達したら、固化材ミルクの注入を開始し、さらに掘削を進める。 Next, the earth and sand are simply dug from the ground G to the empty moat depth H1, and when the empty moat depth H1 is reached, injection of the solidified milk is started, and further excavation proceeds.
図１（ｃ）に示すように、固化材ミルクの注入を継続しつつ、改良体高さＨ２と空堀深さＨ１の和に達するまで、掘削を継続する。ここで、深度が深くなったり、土壌の密度が高くなるなどすると、拘束圧が高まるが、後述する改良を加えてあるため、拘束圧が高くなってもこれを低減し、固化材ミルクをスムーズに混練土に注入できるようになっている。 As shown in FIG. 1C, the excavation is continued until the sum of the improved body height H2 and the empty moat depth H1 is reached while continuing the injection of the solidified milk. Here, when the depth becomes deeper or the density of the soil increases, the restraint pressure increases. However, since the improvements described later have been added, this is reduced even if the restraint pressure increases, and the solidified milk is smoothened. Can be poured into the kneaded soil.
そして、上記和まで深さが到達すると、改良体高さＨ２の改良体５が形成されたことになる。その後、オーガモータ３を逆転させつつ、掘削撹拌装置４を回転させつつ上昇させ、更に混練を進め、図１（ｃ）に示すように、掘削撹拌装置４を地面Ｇ上まで引き上げる。以上のような操作により、地中に改良体高さＨ２の改良体５が造成される。 When the depth reaches the sum, the improved body 5 having the improved body height H2 is formed. Thereafter, the auger motor 3 is rotated in the reverse direction and the excavation agitator 4 is raised while rotating, and the kneading is further proceeded. The excavator agitator 4 is pulled up to the ground G as shown in FIG. By the operation as described above, the improved body 5 having the improved body height H2 is formed in the ground.
以下図２から図４を参照しながら、掘削撹拌装置４について説明する。図２は、本発明の実施の形態１における掘削撹拌装置の側面図、図３（ａ）、図３（ｂ）は、本発明の実施の形態１における掘削撹拌装置の分解説明図、図４は、本発明の実施の形態１における掘削撹拌装置の一部分解説明図である。 Hereinafter, the excavating and stirring device 4 will be described with reference to FIGS. FIG. 2 is a side view of the excavation and agitation device according to Embodiment 1 of the present invention, and FIGS. 3A and 3B are exploded explanatory views of the excavation and agitation device according to Embodiment 1 of the present invention. These are some decomposition | disassembly explanatory drawings of the excavation stirring apparatus in Embodiment 1 of this invention.
この掘削撹拌装置４は、図４に示すように、連結継ぎ手７ａを取り外すと、上方のスクリュー部８と、下方の撹拌ヘッド７とに分割できるが、これは一例に過ぎず、一体的に構成しても良い。 As shown in FIG. 4, the excavation stirring device 4 can be divided into an upper screw portion 8 and a lower stirring head 7 when the coupling joint 7a is removed, but this is only an example, and it is configured integrally. You may do it.
まず、スクリュー部８について説明する。回転軸６は、その上端部が、オーガモータ３に連結され、地中で正転又は逆転して回転する。回転軸６には、掘削翼１０の進行方向とは逆向きに土砂を運搬するスクリュー本体１６が形成されている。スクリュー本体１６のピッチあるいは巻き数などは種々変更可能であり、図示したものに限定されるわけではない。スクリュー本体１６の周囲には、回転軸６に対して回転自在に支持され、かつスクリュー本体１６を包囲する案内筒１８が設けられる。 First, the screw part 8 will be described. The rotating shaft 6 has an upper end connected to the auger motor 3 and rotates forward or reverse in the ground. The rotary shaft 6 is formed with a screw main body 16 that conveys earth and sand in the direction opposite to the traveling direction of the excavating blade 10. The pitch or the number of turns of the screw body 16 can be variously changed, and is not limited to the illustrated one. A guide cylinder 18 is provided around the screw body 16 so as to be rotatably supported by the rotary shaft 6 and surround the screw body 16.
さらに、案内筒１８の側面から外向きに突出し、改良体５の外径線を越えて地山に接触する回り止め板２０が設けられる。回り止め板２０の先端部が地山に接触しているため、回転軸６が盛んに回転しても、案内筒１８は、地山に動きを妨げられ、地中で殆ど静止したままの状態となる。いわば、回り止め板２０と案内筒１８とは、共回り防止翼１４と殆ど同じ振る舞いをすることになる。 Further, a rotation prevention plate 20 that protrudes outward from the side surface of the guide cylinder 18 and that contacts the natural ground beyond the outer diameter line of the improved body 5 is provided. Since the tip of the rotation stopper plate 20 is in contact with the natural ground, even if the rotary shaft 6 is actively rotated, the guide cylinder 18 is prevented from moving by the natural ground and remains almost stationary in the ground. It becomes. In other words, the rotation prevention plate 20 and the guide cylinder 18 behave almost the same as the co-rotation prevention blade 14.
一方、スクリュー本体１６は、回転軸６の回転と一体的に案内筒１８内で回転する。しかも、掘削翼１０の進行方向と、スクリュー本体１６の土砂の運搬方向が逆になっているため、掘削翼１０が正転しつつ下降しているときは、スクリュー本体１６及び案内筒１８の間に拘束された土砂は、上向きに運搬されることになる。逆に、掘削翼１０が逆転しつつ上昇しているときは、スクリュー本体１６及び案内筒１８の間に拘束された土砂は、下向きに埋め戻されることになる。 On the other hand, the screw body 16 rotates in the guide cylinder 18 integrally with the rotation of the rotating shaft 6. In addition, since the traveling direction of the excavating blade 10 and the transporting direction of the earth and sand of the screw main body 16 are reversed, when the excavating blade 10 is descending while rotating forward, the space between the screw main body 16 and the guide cylinder 18 is reduced. The earth and sand restrained by is transported upward. On the contrary, when the excavating blade 10 is rising while being reversed, the earth and sand restrained between the screw body 16 and the guide tube 18 are backfilled downward.
なお、図３に示すように、回転軸６の上下方向に離れた２つの位置には、それぞれ回転軸６に遊嵌されるボス部１３’が設けられ、各ボス部１３’から外向きに延びる連結アーム１７の先端部に、案内筒１８の上下に設けられたコネクタ１９が接続されることにより、案内筒１８は、回転軸６に対して回転自在に支持される。 As shown in FIG. 3, boss portions 13 ′ that are loosely fitted to the rotary shaft 6 are provided at two positions apart from each other in the vertical direction of the rotary shaft 6, and outward from each boss portion 13 ′. By connecting connectors 19 provided at the top and bottom of the guide cylinder 18 to the distal end portion of the connecting arm 17 that extends, the guide cylinder 18 is supported rotatably with respect to the rotating shaft 6.
次に、撹拌ヘッド７について説明する。撹拌ヘッド７の中心は、回転軸６と同径で、連結継ぎ手７ａにより回転軸６の下端部に、同軸的に接続される軸体７ｂである。軸体７ｂの下端部には、コーン部９が設けられ、コーン部９のやや上方の位置において軸体７ｂから水平な掘削翼１０が円周方向に延びている。 Next, the stirring head 7 will be described. The center of the stirring head 7 is a shaft body 7b having the same diameter as the rotating shaft 6 and coaxially connected to the lower end portion of the rotating shaft 6 by a coupling joint 7a. A cone portion 9 is provided at the lower end of the shaft body 7b, and a horizontal excavation blade 10 extends in the circumferential direction from the shaft body 7b at a position slightly above the cone portion 9.
掘削翼１０の下側には、爪１０ａが設けられ、掘削翼１０は掘削撹拌装置４の最下端部で地中を掘削する。図５に平面視で示すように、掘削翼１０の外径Ｄ５は、改良体５の外径そのものとなる。 A claw 10 a is provided on the lower side of the excavation blade 10, and the excavation blade 10 excavates in the ground at the lowermost end portion of the excavation stirring device 4. As shown in a plan view in FIG. 5, the outer diameter D <b> 5 of the excavating blade 10 is the outer diameter itself of the improved body 5.
撹拌翼１０よりも所定距離だけ上方には、軸体７ｂを周回し軸体７ｂに対して遊嵌されるボス部１３を有し、先端部が地山に接触する共回り防止翼１４が設けられる。なお、ボス部１３は、上フランジ１２及び下フランジ１１に挟まれており、回転軸６及び軸体７ｂと上下方向に一体となる。また、共回り防止翼１４より上方には、必要な枚数の撹拌翼１５が設けられる。 Provided above the stirring blade 10 by a predetermined distance is a co-rotation prevention blade 14 that has a boss portion 13 that circulates around the shaft body 7b and is loosely fitted to the shaft body 7b, and whose tip portion contacts the ground. It is done. The boss portion 13 is sandwiched between the upper flange 12 and the lower flange 11, and is integrated with the rotary shaft 6 and the shaft body 7b in the vertical direction. Further, a necessary number of stirring blades 15 are provided above the co-rotation prevention blade 14.
上述したように、スクリュー部８の案内筒２０から外向きに延出する回り止め板２０の外径Ｄ７及び共回り防止翼１４の外径Ｄ６は、掘削翼１０の外径Ｄ５よりも大きく、改良体５よりも外に張り出して地山に接触する。 As described above, the outer diameter D7 of the rotation stopper plate 20 extending outward from the guide cylinder 20 of the screw portion 8 and the outer diameter D6 of the co-rotation prevention blade 14 are larger than the outer diameter D5 of the excavation blade 10. It protrudes outside the improved body 5 and comes into contact with the natural ground.
図２に示すように、案内筒１８の内径Ｄ３及び外径Ｄ４はいずれも掘削翼１０の外径Ｄ５よりも小さい。さらに、スクリュー本体１６の外径Ｄ２は、案内筒１８の内径Ｄ３よりも小さく、当然のことながら、回転軸６の外径Ｄ１は、スクリュー本体１６の外径Ｄ２よりも小さい。 As shown in FIG. 2, the inner diameter D3 and the outer diameter D4 of the guide cylinder 18 are both smaller than the outer diameter D5 of the excavating blade 10. Furthermore, the outer diameter D2 of the screw main body 16 is smaller than the inner diameter D3 of the guide cylinder 18, and naturally, the outer diameter D1 of the rotating shaft 6 is smaller than the outer diameter D2 of the screw main body 16.
以上をまとめると、Ｄ６＞Ｄ５＞Ｄ４＞Ｄ３＞Ｄ２＞Ｄ１及びＤ７＞Ｄ５という条件が満たされる。なお、一般には、共回り防止翼１４の外径Ｄ６と回り止め板２０の外径Ｄ７は、等しくできるが、地山に触れさえすれば十分であるから、これらの外径Ｄ６、Ｄ７が相違する場合も本願発明の保護範囲に含まれる。 In summary, the conditions of D6> D5> D4> D3> D2> D1 and D7> D5 are satisfied. In general, the outer diameter D6 of the co-rotation preventing wing 14 and the outer diameter D7 of the rotation prevention plate 20 can be made equal, but it is sufficient to touch the ground, so the outer diameters D6 and D7 are different. This is also included in the protection scope of the present invention.
以上のように構成すれば、地中内において図６に示す現象を発生させることができる。ここで、図６は、本発明の実施の形態１における掘削撹拌装置の動作説明図である。 If comprised as mentioned above, the phenomenon shown in FIG. 6 can be generated in the underground. Here, FIG. 6 is an operation explanatory diagram of the excavation and agitation apparatus in Embodiment 1 of the present invention.
まず、図６（ａ）に示すように、回転軸６を正転させ、掘削翼１０を回転させながら下降させる場合、地中で矢印に示すような土砂の流動を発生させることができる。即ち、掘削翼１０が下降する際、案内筒１８内のスクリュー本体１６は、案内筒１８内の土砂を上向きに運搬する。したがって、掘削翼１０が混練する混練土に作用する拘束圧が緩和され、掘削翼１０から固化材ミルクをスムーズに混練土へ注入できる。 First, as shown in FIG. 6 (a), when the rotary shaft 6 is rotated forward and the excavating blade 10 is lowered while rotating, it is possible to generate soil flow as indicated by arrows in the ground. That is, when the excavating blade 10 descends, the screw body 16 in the guide cylinder 18 conveys the earth and sand in the guide cylinder 18 upward. Accordingly, the restraining pressure acting on the kneaded soil kneaded by the excavating blade 10 is alleviated, and the solidified milk can be smoothly injected from the excavating blade 10 into the kneaded soil.
このようにすると、上下方向に異なる土質の、複数の地層が存在する場合、改良土が複数の地層をまたがって上下方向に移動することとなり、上下方向においても混練効果が奏されることとなる。その結果、上下方向についても改良体の強度を均一化できることとなり、実用的効果が高い。付言すると、かかる上下方向についての改良体の混練効果は、従来技術のいずれを用いても実現することが極めて困難であった。 In this case, when there are a plurality of formations having different soil properties in the vertical direction, the improved soil moves in the vertical direction across the plurality of formations, and the kneading effect is also exhibited in the vertical direction. . As a result, the strength of the improved body can be made uniform in the vertical direction, and the practical effect is high. In addition, it has been extremely difficult to achieve the kneading effect of the improved body in the vertical direction using any of the conventional techniques.
一方、図６（ｂ）に示すように、回転軸６を逆転させ、掘削翼１０を回転させながら上昇させる場合、地中で矢印に示すような土砂の流動を発生させることができる。即ち、掘削翼１０が上昇する際、案内筒１８内のスクリュー本体１６は、案内筒１８内の土砂を下向きに運搬する。したがって、既に形成されている改良体５にさらに土砂を押し戻すことができ、改良体５の密度を向上させることができる。 On the other hand, as shown in FIG. 6B, when the rotary shaft 6 is reversed and the excavating blade 10 is rotated and rotated, the earth and sand flow as indicated by the arrows can be generated in the ground. That is, when the excavating blade 10 is lifted, the screw body 16 in the guide tube 18 conveys the earth and sand in the guide tube 18 downward. Therefore, the earth and sand can be further pushed back to the improved body 5 already formed, and the density of the improved body 5 can be improved.
以上のように、拘束圧の対策をとることにより、造成される改良体５の品質を格段に向上することができる。案内筒１８の側面は、単なる板材で構成することを基本とするが、所望の孔を開けるなど円周方向に土砂の出入りを許可しても良い。また、案内筒１８の中に入りきれない異物（例えば、石など）があるときは、案内筒１８を取り外して地盤改良を行っても良い。 As described above, the quality of the improved body 5 to be created can be remarkably improved by taking measures against the restraint pressure. The side surface of the guide tube 18 is basically composed of a simple plate material, but it is also possible to permit the entry and exit of earth and sand in the circumferential direction, for example, by opening a desired hole. In addition, when there is a foreign object (for example, stone) that cannot fit in the guide tube 18, the guide tube 18 may be removed to improve the ground.
案内筒１８の長さを最大深度に対して長めに設定し、掘削翼１０が最大深度に達しても、案内筒１８の上端部が、地面Ｇよりも上方に位置するようにしてもよい。こうすると、案内筒１８に作用する抵抗が小さくなり、案内筒１８の引き上げが容易になって好適である。一方、このようにすると、案内筒１８に取り込まれた混練土が地上に排出され得ることになる。地上への混練土の過剰な排出を抑制するため、案内筒１８の強度を維持できる範囲で、案内筒１８の側面に孔を開けても良い。 The length of the guide tube 18 may be set longer than the maximum depth, and the upper end portion of the guide tube 18 may be positioned above the ground G even when the excavating blade 10 reaches the maximum depth. In this case, the resistance acting on the guide tube 18 is reduced, and the guide tube 18 can be easily lifted up. On the other hand, when this is done, the kneaded soil taken into the guide tube 18 can be discharged to the ground. In order to suppress excessive discharge of the kneaded soil to the ground, a hole may be formed in the side surface of the guide tube 18 as long as the strength of the guide tube 18 can be maintained.
本発明に係る掘削撹拌装置は、例えば、地盤改良等を行う分野において好適に利用できる。 The excavation stirring device according to the present invention can be suitably used, for example, in the field of ground improvement.
１ ベースマシン
２ リーダ
３ オーガモータ
４ 掘削撹拌装置
５ 改良体
６ 回転軸
７ 撹拌ヘッド
７ａ 連結継手
８ スクリュー部
９ コーン部
１０ 掘削翼
１０ａ 爪
１１ 下フランジ
１２ 上フランジ
１３、１３’ ボス部
１４ 共回り防止翼
１５ 撹拌翼
１６ スクリュー本体
１７ 連結アーム
１８ 案内筒
１９ コネクタ
２０ 回り止め板
Ｇ 地面
Ｈ１ 空堀深さ
Ｈ２ 改良体高さ
DESCRIPTION OF SYMBOLS 1 Base machine 2 Leader 3 Auger motor 4 Excavation stirring apparatus 5 Improved body 6 Rotating shaft 7 Stirring head 7a Connection joint 8 Screw part 9 Cone part 10 Excavation blade 10a Claw 11 Lower flange 12 Upper flange 13, 13 'Boss part 14 Corotation prevention Blade 15 Stirring blade 16 Screw body 17 Connecting arm 18 Guide cylinder 19 Connector 20 Non-rotating plate G Ground H1 Depth H2 Improved body height
Claims (2)
前記回転軸の下端部に突設され土砂を掘削する掘削翼と、
前記回転軸において前記掘削翼よりも所定距離だけ上方に設けられ、前記回転軸を周回し前記回転軸に対して遊嵌されるボス部を有し、先端部が地山に接触する共回り防止翼と、
前記共回り防止翼よりも上方において前記回転軸に設けられる撹拌翼と、
前記共回り防止翼よりも上方において前記回転軸に設けられ、かつ前記掘削翼の進行方向とは逆向きに前記土砂を運搬するスクリュー本体と、
前記回転軸に対して回転自在に支持され、かつ前記スクリュー本体を包囲する案内筒と、
前記案内筒から外向きに突出し、前記地山に接触する回り止め板とを有することを特徴とする掘削撹拌装置。 A rotating shaft that rotates in the ground,
A drilling wing projecting at the lower end of the rotating shaft and drilling earth and sand;
The rotating shaft is provided above the excavating blade by a predetermined distance, has a boss portion that circulates around the rotating shaft and is loosely fitted to the rotating shaft, and prevents the tip portion from contacting the ground. With wings,
A stirring blade provided on the rotating shaft above the co-rotation preventing blade;
A screw body that is provided on the rotary shaft above the co-rotation prevention blade and that transports the earth and sand in a direction opposite to the traveling direction of the excavation blade;
A guide tube that is rotatably supported with respect to the rotating shaft and surrounds the screw body;
An excavation and agitation device characterized by having an anti-rotation plate that protrudes outward from the guide tube and contacts the natural ground.
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| JPS60258320A (en) * | 1984-06-05 | 1985-12-20 | Wakachiku Kensetsu Kk | Method and device of improving soft ground |
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| US5411353A (en) * | 1993-09-01 | 1995-05-02 | Taki; Osamu | Soil solidification apparatus with a shear blade of adjustable length and rotation speed for creating a ribbed soil-cement pile |
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