JP6759721B2 - Air blow agitation device, air ejection pipe and liquid air blow agitation method - Google Patents

Description

本発明は、地盤中に設けた掘削孔に満たされた液状体を、エアブロー撹拌するための、エアブロー撹拌装置、エア噴出管および液状体のエアブロー撹拌方法に関する。 The present invention relates to an air blow agitator, an air ejection pipe, and an air blow agitation method for a liquid material for air blow agitation of a liquid material filled in an excavation hole provided in the ground.

従来より、地中を溝状に掘削しつつ安定液を供給し、溝壁を安定液にて保護した地中溝を形成した後、地中溝内の安定液を固化材により固化し、地中に壁状の泥水固化体を構築する泥水固化工法が知られている。泥水固化工法の中でも、原位置固化方式は、溝内を満たす安定液をそのまま使用できるため、作業効率がよくまた施工性の高い方法として知られている。 Conventionally, a stabilizing liquid is supplied while excavating the underground in a groove shape to form an underground groove in which the groove wall is protected by the stabilizing liquid, and then the stabilizing liquid in the underground groove is solidified by a solidifying material and placed in the ground. A muddy water solidification method for constructing a wall-shaped muddy water solidified body is known. Among the muddy water solidification methods, the in-situ solidification method is known as a method with good work efficiency and high workability because the stabilizing liquid that fills the groove can be used as it is.

具体的には、例えば、特許文献１には、溝内安定液が満たされている溝内に固化材を投入し、エアホースを用いたエアブロー撹拌により固化材と溝内安定液を撹拌した後、固化させて地中壁を築造する方法が開示されている。また、特許文献２には、泥水が満たされた溝状の掘削穴に鋼管パイプを建て込み、鋼管パイプを介してエアを送り込むことによるエアブロー撹拌を行って泥水とセメントを撹拌した後、固化させる方法が開示されている。 Specifically, for example, in Patent Document 1, a solidifying material is put into a groove filled with an in-groove stabilizer, and the solidifying material and the in-groove stabilizer are stirred by air blow stirring using an air hose. A method of solidifying and constructing an underground wall is disclosed. Further, in Patent Document 2, a steel pipe is built in a groove-shaped excavation hole filled with muddy water, and air blow agitation is performed by sending air through the steel pipe pipe to stir the muddy water and cement and then solidify. The method is disclosed.

特開２００３−２６８７６３号公報Japanese Unexamined Patent Publication No. 2003-268763 特開平９−１３３７３号公報Japanese Unexamined Patent Publication No. 9-13373

上記のように、掘削孔が平面視長方形の掘削溝の場合には、平面視で長手方向に対して幅が短いため、エアの噴出口を掘削溝の長手方向に複数配置することで、掘削溝内全体を均等にエアブロー撹拌することが可能である。しかし、掘削穴が例えば大口径の円柱状や多角柱状のような場合には、平面視で掘削穴全体を網羅するようにエアの噴出口を設置する必要があるため、大量のエアホースを要するとともに使用空気量も過大となり、大出力のコンプレッサーが必要となる。 As described above, when the excavation hole is a rectangular excavation groove in a plan view, the width is short in the longitudinal direction in a plan view. Therefore, by arranging a plurality of air outlets in the longitudinal direction of the excavation groove, excavation is performed. It is possible to evenly air blow and stir the entire groove. However, when the excavation hole is, for example, a large-diameter columnar or polygonal columnar, it is necessary to install an air outlet so as to cover the entire excavation hole in a plan view, which requires a large amount of air hose. The amount of air used becomes excessive, and a high-power compressor is required.

本発明は、かかる課題に鑑みなされたものであって、その主な目的は、地中に設けられた掘削孔の断面形状や口径の大きさにかかわらず、充填された液状体に対して効率よく安価にエアブロー撹拌を行うことの可能なエアブロー撹拌装置、エア噴出管および液状体のエアブロー撹拌方法を提供する。 The present invention has been made in view of such a problem, and a main object thereof is efficiency with respect to a filled liquid material regardless of the cross-sectional shape and the size of the diameter of the excavation hole provided in the ground. Provided are an air blow agitator, an air ejection pipe, and an air blow agitation method for a liquid material, which can perform air blow agitation well and inexpensively.

かかる目的を達成するため本発明のエアブロー撹拌装置は、掘削孔に充填された液状体をエアブロー撹拌するための、エアブロー撹拌装置であって、前記掘削孔内の深度方向に延在するよう挿入され、エア供給パイプが長手方向に沿って設置される支柱と、該支柱の下端に接合され、前記エア供給パイプから供給されたエアを噴出するエア噴出器とよりなり、前記エア噴出器が、前記支柱から孔壁に向かって延在するように設置される複数の張出し部材と、該張出し部材各々に設置され、軸心が該張出し部材の延在方向と平行になるよう配置される複数のエア噴出管と、前記張出し部材各々に設置され、前記エア噴出管の孔壁と対向する面より孔壁に近接する位置に配置される複数の緩衝部材とを備え、前記エア噴出管および前記緩衝部材がともに、前記張出し部材の延在方向に位置調整可能に設置されることを特徴とする。 In order to achieve such an object, the air blow agitator of the present invention is an air blow agitator for air blow agitating the liquid material filled in the drill hole, and is inserted so as to extend in the depth direction in the drill hole. The air ejector is composed of a support column in which an air supply pipe is installed along the longitudinal direction and an air ejector joined to the lower end of the support column to eject air supplied from the air supply pipe. A plurality of overhanging members installed so as to extend from the support column toward the hole wall, and a plurality of airs installed on each of the overhanging members and arranged so that the axis is parallel to the extending direction of the overhanging member. The air ejection pipe and the cushioning member are provided with a plurality of cushioning members installed in each of the overhanging members and arranged at positions closer to the hole wall than the surface facing the hole wall of the air ejection pipe. Both are characterized in that they are installed so that their positions can be adjusted in the extending direction of the overhanging member.

本発明のエアブロー撹拌装置によれば、掘削孔の断面形状や口径の大きさにかかわらず、孔壁の近傍にエア噴出管を配置することができる。これにより、エア噴出管より液状体中に噴出されるエアは、拡散することなく孔壁に沿って深度方向上方へ移動するため、エアの上昇とともに孔底近傍に滞留している液状体が孔壁に沿って上昇し、また、孔口近傍の液状体が孔底に向かって下降するような深度方向の循環流を生じさせることが可能となる。したがって、支柱から孔壁に向かって延在する複数のエア噴出管を、孔壁の近傍であって掘削孔の断面形状に応じた適宜の平面視位置に配置することで、少ないエア噴出管で安価に効率よく深度方向の循環流を掘削孔内全域に対して生じさせることが可能となる。 According to the air blow agitator of the present invention, the air ejection pipe can be arranged in the vicinity of the hole wall regardless of the cross-sectional shape and the size of the diameter of the excavation hole. As a result, the air ejected from the air ejection pipe into the liquid body moves upward in the depth direction along the hole wall without diffusing, so that the liquid body staying near the bottom of the hole becomes a hole as the air rises. It is possible to generate a circulating flow in the depth direction in which the liquid material rises along the wall and the liquid material in the vicinity of the hole mouth descends toward the hole bottom. Therefore, by arranging a plurality of air ejection pipes extending from the column toward the hole wall at appropriate plan view positions in the vicinity of the hole wall according to the cross-sectional shape of the excavation hole, a small number of air ejection pipes can be used. It is possible to inexpensively and efficiently generate a circulating flow in the depth direction over the entire area of the drilling hole.

また、エア噴出管の孔壁と対向する面より、孔壁に近接する位置に緩衝部材が配置されていることから、掘削孔内へのエアブロー撹拌装置の建込み作業中に、エアブロー撹拌装置に対して不慮の横方向の力が作用しても、緩衝部材によりエア噴出管が孔壁に衝突することを防止できるため、エア噴出管の破損を防止することが可能となる。 Further, since the cushioning member is arranged at a position closer to the hole wall than the surface of the air ejection pipe facing the hole wall, the air blow agitator can be used during the construction work of the air blow agitator in the drilling hole. On the other hand, even if an unexpected lateral force is applied, the cushioning member can prevent the air ejection pipe from colliding with the hole wall, so that the air ejection pipe can be prevented from being damaged.

本発明の液状体のエアブロー撹拌方法は、掘削孔に充填された液状体を、本発明のエアブロー撹拌装置にてエアブロー撹拌する、液状体のエアブロー撹拌方法であって、前記エア噴出器を掘削孔内に配置した際に、前記エア噴出管が孔壁近傍に配置され、前記緩衝部材が前記エア噴出管の孔壁と対向する面より孔壁に近接した位置に配置されるよう、前記張出し部材に対する前記緩衝部材と前記エア噴出管の位置調整を地上にて行い、前記エアブロー撹拌装置を前記掘削孔内に挿入して、前記エア噴出器を孔底近傍まで到達させた後、該エア噴出器より前記液状体にエアを噴出させることを特徴とする。 The liquid material air blow agitation method of the present invention is a liquid material air blow agitation method in which the liquid material filled in the drilling hole is air blow agitated by the air blow stirring device of the present invention, and the air ejector is formed in the drilling hole. The overhanging member is arranged so that the air ejection pipe is arranged near the hole wall and the cushioning member is arranged at a position closer to the hole wall than the surface of the air ejection pipe facing the hole wall when arranged inside. The position of the shock absorber and the air ejection pipe is adjusted on the ground, the air blow agitator is inserted into the drilling hole, the air ejector is brought to the vicinity of the hole bottom, and then the air ejector is provided. It is characterized in that air is blown out to the liquid material.

本発明の液状体のエアブロー撹拌方法によれば、地上にて前記張出し部材に対する前記緩衝部材と前記エア噴出管の位置調整作業を行い、前記エア噴出器を掘削孔の断面形状や口径の大きさに応じた形状に調整できるため、掘削孔内の液状体に対して効率よく確実にエアブロー撹拌を行うことができるとともに、エアブロー撹拌に係る作業効率を大幅に向上することが可能となる。 According to the liquid air blow agitation method of the present invention, the positions of the cushioning member and the air ejection pipe are adjusted on the ground with respect to the overhanging member, and the air ejector is provided with the cross-sectional shape and the size of the drill hole. Since the shape can be adjusted according to the above, it is possible to efficiently and surely perform air blow agitation for the liquid material in the drilling hole, and it is possible to significantly improve the work efficiency related to air blow agitation.

また、エア噴出管が、複数のエア噴出口を備えることとすれば、孔底近傍に滞留している液状体を上昇させ、また、孔口近傍の液状体が孔底に向かって下降させるような深度方向の循環流を生じさせるエアを、効率よく液状体内に噴出することができる。また、端部もしくは端部近傍に開口を設け、着脱自在な蓋材を設けることから、蓋材を取り外すことにより開口を利用して、エア噴出管内に貯留した粘土等の細粒分を水等で洗浄しエア噴出口の目詰まりを除去してエア噴出機能を回復させることかできる等、メンテナンスを容易に行うことが可能となる。
Further, the air ejection tube, if a child with a plurality of air ejection port, increase the liquid material remaining in the hole near the bottom, also, the liquid material hole opening neighborhood lowers toward the bottom of the hole Air that generates a circulating flow in the depth direction can be efficiently ejected into the liquid body. In addition, since an opening is provided at or near the end and a removable lid material is provided, the opening can be used by removing the lid material to remove fine particles of clay or the like stored in the air ejection pipe with water or the like. Maintenance can be easily performed, for example, the air ejection function can be restored by cleaning with the air ejection port to clear the clogging of the air ejection port.

本発明によれば、掘削孔の断面形状がいずれの形状また大口径であっても、エア噴出管を孔壁の近傍に配置して深度方向の循環流を発生させることができることから、これらエア噴出管を孔壁の近傍であって掘削孔の断面形状に応じた適宜の平面視位置に複数配置することで、深度方向の循環流を掘削孔全域に発生させることができ、地盤中の掘削孔を満たす液状体を、少ないエア噴出管で安価に効率よくエアブロー撹拌することが可能となる。 According to the present invention, regardless of the cross-sectional shape of the excavation hole and the large diameter, the air ejection pipe can be arranged in the vicinity of the hole wall to generate a circulating flow in the depth direction. By arranging a plurality of ejection pipes in the vicinity of the hole wall and at appropriate plan view positions according to the cross-sectional shape of the excavation hole, a circulation flow in the depth direction can be generated in the entire excavation hole, and excavation in the ground. It is possible to inexpensively and efficiently air blow and stir the liquid material that fills the pores with a small number of air ejection pipes.

本発明におけるエアブロー撹拌装置の概略を示す図である。It is a figure which shows the outline of the air blow agitator in this invention. 本発明におけるエア噴射管を突出させた状態のエア噴出器の詳細を示す図である。It is a figure which shows the detail of the air ejector in the state which protruded the air injection pipe in this invention. 本発明におけるエア噴射管を突出させた状態のエア噴出器の下面を示す図である。It is a figure which shows the lower surface of the air ejector in the state which protruded the air injection pipe in this invention. 本発明におけるエア噴射管を収納した状態のエア噴出器の詳細を示す図である。It is a figure which shows the detail of the air ejector in the state which housed the air injection pipe in this invention. 本発明におけるエア噴射管を収納した状態のエア噴出器の下面を示す図である。It is a figure which shows the lower surface of the air ejector in the state which housed the air injection pipe in this invention. 本発明における液状体をエアブロー撹拌する様子を示す図である。It is a figure which shows the state of air blow stirring of the liquid material in this invention. 本発明におけるエア噴射管の他の実施の形態を示す図である。It is a figure which shows the other embodiment of the air injection pipe in this invention. 本発明におけるエア噴射管の他の実施の形態の態様を示す図である。It is a figure which shows the aspect of another embodiment of the air injection pipe in this invention. 本発明におけるエア噴射管の洗浄の様子を示す図である。It is a figure which shows the state of cleaning of the air injection pipe in this invention.

本発明のエアブロー撹拌装置は、地盤中に設けられた掘削孔が、例えば３ｍを超えるような大口径、２０ｍを超えるような大深度であっても、掘削孔を満たす液状体全体をエアブロー撹拌することの可能な装置である。 The air blow agitator of the present invention air blows and agitates the entire liquid material that fills the excavation hole even if the excavation hole provided in the ground has a large diameter of more than 3 m and a large depth of more than 20 m, for example. It is a possible device.

本実施の形態では、掘削孔の断面形状が円形である場合を事例として説明するが、その断面形状はこれに限定されるものではなく、多角形や楕円形等、いずれの断面形状を備える掘削孔でもよい。また、エアブロー撹拌の対象となる液状体についても、安定液や、安定液と泥水固化材の混合物等、いずれを採用してもよい。
以下に、図１〜図７を参照して本発明のエアブロー撹拌装置を説明する。 In the present embodiment, a case where the cross-sectional shape of the excavation hole is circular will be described as an example, but the cross-sectional shape is not limited to this, and excavation having any cross-sectional shape such as a polygon or an ellipse. It may be a hole. Further, as the liquid material to be agitated by air blow, any of a stabilizing liquid, a mixture of the stabilizing liquid and the muddy water solidifying material, or the like may be adopted.
The air blow agitator of the present invention will be described below with reference to FIGS. 1 to 7.

エアブロー撹拌装置１は、図１で示すように、地盤中に形成された掘削孔Ｈ内で深度方向に延在するように挿入される支柱２と、支柱２の下端に接合されるエア噴出器８とにより構成されている。なお、深度方向とは、鉛直方向および略鉛直方向を含む。 As shown in FIG. 1, the air blow agitator 1 includes a support column 2 inserted so as to extend in the depth direction in the excavation hole H formed in the ground, and an air ejector joined to the lower end of the support column 2. It is composed of 8. The depth direction includes a vertical direction and a substantially vertical direction.

支柱２は、複数の棒状部材３と、棒状部材３を長手方向に連結するための連結部材４とを備えている。棒状部材３は、長手方向に沿ってエア供給配管５を収納可能なスペースを有する部材からなり、本実施の形態ではＨ形鋼を採用している。また、図１中に拡大して示すように、連結部材４は、２本のかんざし筋６と、一対のカバー部材７とを備えている。 The support column 2 includes a plurality of rod-shaped members 3 and a connecting member 4 for connecting the rod-shaped members 3 in the longitudinal direction. The rod-shaped member 3 is composed of a member having a space for accommodating the air supply pipe 5 along the longitudinal direction, and H-shaped steel is adopted in the present embodiment. Further, as shown enlarged in FIG. 1, the connecting member 4 includes two hairpin bars 6 and a pair of cover members 7.

カバー部材７は、一対の平鋼板よりなり、端部どうしを突き合わせた状態で長手方向に連続して配置された隣り合う棒状部材３の両者に跨るように、かつ棒状部材３を挟み込むように配置されている。そして、隣り合う棒状部材３にはそれぞれ、カバー部材７が配置される高さ位置に図示しない貫通孔が設けられるとともに、カバー部材７にも、棒状部材３の貫通孔と対向する位置に図示しないかんざし孔が設けられている。これにより、隣り合う棒状部材３各々の貫通孔とカバー部材７のかんざし孔にかんざし筋６を貫通させることで、隣り合う棒状部材３どうしが連結され支柱２を構成する。 The cover member 7 is made of a pair of flat steel plates, and is arranged so as to straddle both of adjacent rod-shaped members 3 which are continuously arranged in the longitudinal direction with their ends abutted against each other and to sandwich the rod-shaped members 3. Has been done. Each of the adjacent rod-shaped members 3 is provided with a through hole (not shown) at a height position where the cover member 7 is arranged, and the cover member 7 is also not shown at a position facing the through hole of the rod-shaped member 3. A hairpin hole is provided. As a result, the hairpins 6 are passed through the through holes of the adjacent rod-shaped members 3 and the hairpin holes of the cover member 7, so that the adjacent rod-shaped members 3 are connected to each other to form the support column 2.

一方、エア噴出器８は、図２で示すように、複数の張出し部材９と、張出し部材９各々に設置されるエア噴出管１０と、同じく張出し部材９各々に設置される緩衝部材１５と、エアブロー撹拌装置１を地表面や架台上等に載置するための脚部材１７と、により構成されている。 On the other hand, as shown in FIG. 2, the air ejector 8 includes a plurality of overhanging members 9, an air ejection pipe 10 installed on each of the overhanging members 9, and a cushioning member 15 also installed on each of the overhanging members 9. It is composed of leg members 17 for mounting the air blow stirring device 1 on the ground surface, a gantry, or the like.

張出し部材９は、図２で示すように、支柱２の下端部より上方で支柱２を挟むように設置された一対の溝形鋼よりなる上張出し部材９１と、支柱２の下端部に設置されたＨ形鋼よりなる下張出し部材９２を備えており、これらはともに、支柱２から孔壁に向けて同一方向に延在するよう設置されている。また、上張出し部材９１の上面、下張出し部材９２の上面および下面にはそれぞれ、図示しないボルト穴が長手方向に間隔を有して複数形成されている。このような構成の張出し部材９を、本実施の形態では図３で示すように、９０度の間隔をもって放射状に４体設置した。ただし、その数量や配置位置はこれに限定されるものではなく、掘削孔Ｈの口径や断面形状に応じて適宜増減可能である。 As shown in FIG. 2, the overhanging member 9 is installed at the upper overhanging member 91 made of a pair of channel steels installed so as to sandwich the strut 2 above the lower end portion of the strut 2, and at the lower end portion of the strut 2. It is provided with an underhanging member 92 made of H-shaped steel, both of which are installed so as to extend in the same direction from the support column 2 toward the hole wall. Further, a plurality of bolt holes (not shown) are formed on the upper surface of the upper overhang member 91 and the upper surface and the lower surface of the lower overhang member 92 at intervals in the longitudinal direction, respectively. In this embodiment, four overhanging members 9 having such a configuration are installed radially at intervals of 90 degrees, as shown in FIG. However, the quantity and the arrangement position are not limited to this, and can be appropriately increased or decreased according to the diameter and the cross-sectional shape of the excavation hole H.

エア噴出管１０は、図２で示すように、両端部がそれぞれ着脱自在な蓋材１１にて閉塞された筒状部材により構成されており、その周面には、軸心方向に沿って複数のエア噴出口１２が備えられている。また、エア噴出管１０は、軸心が下張出し部材９２の延在方向と平行となる姿勢で下張出し部材９２の下方に配置され、支柱２の近傍に位置する蓋材１１に、エア供給配管５の先端が接続されている。エア供給配管５の基端は、図１で示すようにコンプレッサーＣに接続されており、これにより、エア供給配管５からエア噴出管１０に供給されたエアは、エア噴出口１２から液状体Ｌへ噴出されることとなる。 As shown in FIG. 2, the air ejection pipe 10 is composed of a tubular member whose both ends are closed with removable lid members 11, and a plurality of air ejection pipes 10 are formed on their peripheral surfaces along the axial direction. The air outlet 12 of the above is provided. Further, the air ejection pipe 10 is arranged below the lower overhanging member 92 in a posture in which the axis is parallel to the extending direction of the lower overhanging member 92, and the air supply pipe is attached to the lid member 11 located near the support column 2. The tips of 5 are connected. The base end of the air supply pipe 5 is connected to the compressor C as shown in FIG. 1, whereby the air supplied from the air supply pipe 5 to the air ejection pipe 10 is liquid L from the air outlet 12. Will be ejected to.

そして、エア噴出管１０を下張出し部材９２に取り付ける際には、エア噴出管１０に、下張出し部材９２に取り付けるための設置部材１３が設けられていることから、下張出し部材９２の下面に設けたボルト穴と、エア噴出管１０の設置部材１３に設けたボルト穴を位置合わせし、ボルト１４により締結する。 When the air ejection pipe 10 is attached to the underhanging member 92, since the air ejection pipe 10 is provided with the installation member 13 for attaching to the underhanging member 92, the air ejection pipe 10 is provided on the lower surface of the underhanging member 92. Align the bolt hole provided with the bolt hole provided in the installation member 13 of the air ejection pipe 10 and fasten with the bolt 14.

こうして下張出し部材９２に取り付けられたエア噴出管１０は、下張出し部材９２の下面に設けた複数のボルト穴のうち、支柱２から離間する位置のボルト穴とエア噴出管１０の設置部材１３に設けたボルト穴とを位置合わせし、ボルト１４により締結すると、図２および図３で示すように、孔壁に向けて下張出し部材９２より突出させることができる。 The air ejection pipe 10 attached to the underhanging member 92 in this way is provided in the bolt hole at a position separated from the support column 2 and the installation member 13 of the air ejection pipe 10 among the plurality of bolt holes provided on the lower surface of the underhanging member 92. When the provided bolt holes are aligned and fastened with the bolts 14, they can be projected from the underhanging member 92 toward the hole wall as shown in FIGS. 2 and 3.

また、下張出し部材９２の下面に設けた複数のボルト穴のうち、支柱２の近傍に位置するボルト穴とエア噴出管１０の設置部材１３に設けたボルト穴とを位置合わせし、ボルト１４により締結することで、図４および図５で示すように、エア噴出管１０を、下張出し部材９２の下方に収納することができる。このように、掘削孔Ｈの口径や断面形状に応じて、下張出し部材９２に対するエア噴出管１０の取り付け位置を調整することで、エア噴出管１０を孔壁の近傍に配置してエアを噴出させることが可能となる。 Further, among the plurality of bolt holes provided on the lower surface of the underhanging member 92, the bolt holes located in the vicinity of the support column 2 and the bolt holes provided in the installation member 13 of the air ejection pipe 10 are aligned with each other, and the bolts 14 are used. By fastening, the air ejection pipe 10 can be housed below the underhanging member 92, as shown in FIGS. 4 and 5. In this way, by adjusting the mounting position of the air ejection pipe 10 with respect to the underhanging member 92 according to the diameter and the cross-sectional shape of the excavation hole H, the air ejection pipe 10 is arranged in the vicinity of the hole wall to eject air. It becomes possible to make it.

緩衝部材１５は、図３で示すように、表面が掘削孔Ｈの孔壁面に沿う弧状に形成された板状部材よりなり、図２で示すように、接合部材１６を介して張出し部材９に設置されている。接合部材１６は、緩衝部材１５の裏面に高さ位置をずらして取り付けられた上接合部材１６１と下接合部材１６２よりなる。これらは、長手方向に図示しない複数のボルト穴を備えた山形鋼よりなり、軸心が張出し部材９の延在方向と平行となる姿勢で、上接合部材１６１が上張出し部材９１の上面に、下接合部材１６２が下張出し部材９２の上面にそれぞれ配置されている。 As shown in FIG. 3, the cushioning member 15 is composed of a plate-shaped member whose surface is formed in an arc shape along the hole wall surface of the excavation hole H, and as shown in FIG. 2, the overhanging member 9 is formed via the joining member 16. is set up. The joining member 16 is composed of an upper joining member 161 and a lower joining member 162 that are attached to the back surface of the cushioning member 15 at different heights. These are made of angle steel having a plurality of bolt holes (not shown) in the longitudinal direction, and the upper joining member 161 is placed on the upper surface of the overhanging member 91 in a posture in which the axis is parallel to the extending direction of the overhanging member 9. The lower joining member 162 is arranged on the upper surface of the lower overhanging member 92, respectively.

そして、緩衝部材１５を張出し部材９に取り付ける際には、先にも述べたように、上張出し部材９１および下張出し部材９２各々の上面に図示しないボルト孔が設けられているから、上接合部材１６１に設けたボルト穴と上張出し部材９１に設けたボルト穴を位置合わせするとともに、下接合部材１６２に設けたボルト穴と下張出し部材９２に設けたボルト穴を位置合わせした上で、ボルト１４により締結する。 When the cushioning member 15 is attached to the overhanging member 9, as described above, since bolt holes (not shown) are provided on the upper surfaces of the upper overhanging member 91 and the lower overhanging member 92, the upper joining member After aligning the bolt hole provided in 161 and the bolt hole provided in the upper overhang member 91, and aligning the bolt hole provided in the lower joining member 162 and the bolt hole provided in the lower overhang member 92, the bolt 14 To be concluded by.

このとき、張出し部材９に対する緩衝部材１５の取り付け位置は、図２で示すように、緩衝部材１５の表面が、エア噴出管１０の孔壁と対向する面となる蓋材１１より常に孔壁側に位置するよう、一対の接合部材１６のボルト穴と張出し部材９のボルト穴との位置合わせを行う。 At this time, as shown in FIG. 2, the mounting position of the cushioning member 15 with respect to the overhanging member 9 is always on the hole wall side of the lid material 11 on which the surface of the cushioning member 15 faces the hole wall of the air ejection pipe 10. The bolt holes of the pair of joining members 16 and the bolt holes of the overhanging member 9 are aligned so as to be located at.

脚部材１７は、図２で示すように、複数のＵ字筋よりなり、開口面を下張出し部材９２の延在方向にむけた姿勢で間隔を有して複数配置されている。そして、下張出し部材９２の下面に設けたボルト穴を介して、エア噴出管１０を内包する態様で、着脱自在に設置されている。 As shown in FIG. 2, the leg members 17 are composed of a plurality of U-shaped streaks, and a plurality of leg members 17 are arranged at intervals in a posture in which the opening surface is directed toward the extending direction of the underhanging member 92. The air ejection pipe 10 is detachably installed in a manner of including the air ejection pipe 10 through a bolt hole provided on the lower surface of the underhanging member 92.

上述する構成のエアブロー撹拌装置１の使用方法を以下に示す。 The usage method of the air blow stirring device 1 having the above-described configuration is shown below.

まず、掘削孔Ｈの孔壁近傍にエア噴出管１０が配置されるよう、掘削孔Ｈの断面形状や口径の大きさに応じて張出し部材９に対するエア噴出管１０および緩衝部材１５の取り付け位置を確認し、地上にて張出し部材９に対するエア噴出管１０および緩衝部材１５の取り付け位置を調整し、エア噴出器８を掘削孔Ｈの断面形状や口径の大きさに応じた形状に調整する。このとき、下張出し部材９２には脚部材１７が備えられているため、エアブロー撹拌装置１を地面上に載置した状態で、エア噴出管１０および緩衝部材１５の位置調整作業を行うことができる。 First, the attachment positions of the air ejection pipe 10 and the cushioning member 15 with respect to the overhanging member 9 are set according to the cross-sectional shape and the size of the diameter of the excavation hole H so that the air ejection pipe 10 is arranged near the hole wall of the excavation hole H. After confirming, the attachment positions of the air ejection pipe 10 and the buffer member 15 with respect to the overhanging member 9 are adjusted on the ground, and the air ejector 8 is adjusted to a shape corresponding to the cross-sectional shape and the size of the diameter of the excavation hole H. At this time, since the underhanging member 92 is provided with the leg member 17, the position adjusting work of the air ejection pipe 10 and the cushioning member 15 can be performed while the air blow stirring device 1 is placed on the ground. ..

次に、エアブロー撹拌装置１を吊持状態で掘削孔Ｈ内に建て込む。掘削孔Ｈが長大な場合には、エア噴出器８が掘削孔Ｈの孔底近傍に到達するまで、棒状部材３を連結部材４により継ぎ足しながら、掘削孔Ｈに挿入していく。なお、エアブロー撹拌装置１の建込み作業時において、エアブロー撹拌装置１に不慮の横方向の力が作用しても、孔壁に緩衝部材１５が先行して接触しエア噴出管１０を保護するため、エア噴出器８が破損することはない。 Next, the air blow stirring device 1 is built in the excavation hole H in a suspended state. When the excavation hole H is long, the rod-shaped member 3 is inserted into the excavation hole H while being added by the connecting member 4 until the air ejector 8 reaches the vicinity of the hole bottom of the excavation hole H. In addition, even if an unexpected lateral force acts on the air blow stirring device 1 during the building work of the air blow stirring device 1, the cushioning member 15 comes into contact with the hole wall in advance to protect the air ejection pipe 10. , The air ejector 8 will not be damaged.

エアブロー撹拌装置１の据え付けが完了した後、エア供給管５を介してエア噴出器８のエア噴出管１０にエアを供給し、エア噴出口１２からエアを噴出して掘削孔Ｈ内の液状体Ｌをエアブロー撹拌する。 After the installation of the air blow agitator 1 is completed, air is supplied to the air ejection pipe 10 of the air ejector 8 via the air supply pipe 5, and air is ejected from the air ejection port 12 to eject the liquid material in the excavation hole H. L is air blown and stirred.

エア噴出管１０を孔壁の近傍に配置することで、エア噴出口１２から噴出し上昇するエアは、孔壁によって移動方向を規制され、拡散することなく孔壁に沿って深度方向上方へ移動する。これにより、図６で示すように、孔底近傍に滞留している液状体Ｌがエアとともに孔壁に沿って杭口に向かって上昇し、また、孔口近傍の液状体Ｌが孔底に向かって下降するような、深度方向の循環流が生じる。本実施の形態では、支柱２から孔壁に向かって延在するエア噴出管１０が９０度間隔で４体設置されているため、孔壁に沿って上昇し掘削孔中心近傍で下降する深度方向の循環流を掘削孔内全域に対して生じさせることができ、掘削孔Ｈに充填された液状体Ｌは効率よく撹拌されることとなる。 By arranging the air ejection pipe 10 in the vicinity of the hole wall, the air ejected and rising from the air ejection port 12 is restricted in the moving direction by the hole wall and moves upward in the depth direction along the hole wall without being diffused. To do. As a result, as shown in FIG. 6, the liquid L staying near the hole bottom rises toward the pile mouth along the hole wall together with the air, and the liquid L near the hole bottom becomes the hole bottom. A circulating flow in the depth direction occurs, as if descending toward it. In the present embodiment, since four air ejection pipes 10 extending from the column 2 toward the hole wall are installed at intervals of 90 degrees, the depth direction is ascending along the hole wall and descending near the center of the excavation hole. The circulating flow of the above can be generated in the entire area inside the excavation hole, and the liquid body L filled in the excavation hole H is efficiently agitated.

このように、エア噴出管１０を孔壁の近傍であって掘削孔Ｈの断面形状に応じた適宜の平面視位置に複数配置することで、深度方向の循環流を掘削孔Ｈ全域に発生させることができ、地盤中の掘削孔Ｈを満たす液状体Ｌを、少ないエア噴出管１０で安価に効率よくエアブロー撹拌することが可能となる。 In this way, by arranging a plurality of air ejection pipes 10 in the vicinity of the hole wall and at appropriate plan view positions according to the cross-sectional shape of the excavation hole H, a circulation flow in the depth direction is generated in the entire excavation hole H. This makes it possible to inexpensively and efficiently agitate the liquid body L that fills the excavation hole H in the ground with a small amount of air ejection pipe 10.

本発明のエアブロー撹拌装置１は、上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々の変更が可能であることはいうまでもない。 It goes without saying that the air blow stirring device 1 of the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the present invention.

例えば、本実施の形態では、エア噴出管１０を円筒状部材にて形成したが、必ずしもこれに限定されるものではなく、図７で示すように、円筒状部材の孔壁と対向する側の端部に他の円筒状部材を直交するように組み合わせた、Ｔ字状をなす外形に形成したものを採用してもよい。この場合にも、緩衝部材１５は、Ｔ字状をなすエア噴出管１０の孔壁と対向する面より孔壁に近接する位置に配置される。 For example, in the present embodiment, the air ejection pipe 10 is formed of a cylindrical member, but the present invention is not necessarily limited to this, and as shown in FIG. 7, the side of the cylindrical member facing the hole wall A T-shaped outer shape formed by combining other cylindrical members at the ends so as to be orthogonal to each other may be adopted. Also in this case, the cushioning member 15 is arranged at a position closer to the hole wall than the surface of the T-shaped air ejection pipe 10 facing the hole wall.

具体的には図７で示すように、張出し部材９に平行な本体部１０１と、本体部１０１に直交する直交部１０２とによりＴ字形状のエア噴出管１０は構成され、両者の内空は連通している。本体部１０１は円筒状部材よりなり、掘削孔Ｈの中心部側に位置する端部が塞がれている。 Specifically, as shown in FIG. 7, the T-shaped air ejection pipe 10 is composed of the main body 101 parallel to the overhanging member 9 and the orthogonal portion 102 orthogonal to the main body 101, and the inner space between the two is Communicating. The main body 101 is made of a cylindrical member, and the end portion located on the central portion side of the excavation hole H is closed.

図８（ａ）（ｂ）で示すように、本体部１０１の周面は、軸心方向に沿って複数のエア噴出口１２が備えられるとともに、掘削孔Ｈの中心部側に位置する端部と近接する位置に開口が設けられ、これを閉塞するように蓋材１１が着脱自在に設置されている。この開口は、エア噴出口１２より十分大きく、本体部１０１の管径と略同等もしくはやや小さい口径に形成されている。一方、直交部１０２も円筒状部材よりなり、その両端部が開口され、これを閉塞するようにエア噴出口１２を備えた噴出口付き蓋材１１１が着脱自在に設置されている。 As shown in FIGS. 8A and 8B, the peripheral surface of the main body 101 is provided with a plurality of air ejection ports 12 along the axial direction, and an end portion located on the central portion side of the excavation hole H. An opening is provided at a position close to the lid, and the lid member 11 is detachably installed so as to close the opening. This opening is sufficiently larger than the air ejection port 12 and is formed to have a diameter substantially equal to or slightly smaller than the pipe diameter of the main body 101. On the other hand, the orthogonal portion 102 is also made of a cylindrical member, both ends thereof are opened, and a lid member 111 with an outlet provided with an air outlet 12 is detachably installed so as to close the both ends thereof.

このような構成のＴ字形状のエア噴出管１０は、本体部１０１の周面にエア供給配管５が接続されており、エア供給配管５からエア噴出管１０に供給されたエアは、本体部１０１だけでなく直交部１０２に備えた噴出口付き蓋材１１１のエア噴出口１２からも液状体Ｌへ噴出される。したがって、孔壁に最も近接し、かつ隣り合うＴ字形状のエア噴出管１０の間に形成された空間からもエアが噴出し、孔壁に沿って深度方向上方へ移動することとなる。 In the T-shaped air ejection pipe 10 having such a configuration, the air supply pipe 5 is connected to the peripheral surface of the main body 101, and the air supplied from the air supply pipe 5 to the air ejection pipe 10 is the main body. Not only 101 but also the air outlet 12 of the lid member 111 with an outlet provided in the orthogonal portion 102 is ejected to the liquid body L. Therefore, air is ejected from the space formed between the T-shaped air ejection pipes 10 closest to the hole wall and adjacent to each other, and moves upward in the depth direction along the hole wall.

これにより、先に図６で示した孔底近傍に滞留している液状体Ｌがエアとともに孔壁に沿って杭口に向かって上昇し、孔口近傍の液状体Ｌが孔底に向かって下降するような深度方向の循環流を、掘削孔Ｈの全域に対してより効率よくが生じさせることが可能となる。 As a result, the liquid L remaining in the vicinity of the hole bottom shown in FIG. 6 rises toward the pile mouth along the hole wall together with the air, and the liquid L in the vicinity of the hole bottom moves toward the hole bottom. It is possible to more efficiently generate a circulating flow in the depth direction that descends over the entire area of the drilling hole H.

また、掘削孔が例えば５０ｍに達するような大深度である場合には、水圧によりエア噴出口１２からエア噴出管１０に粘土成分等の細粒分Ｍが入り込み、エア噴出口１２に目詰まりを生じやすい。そこで、エア噴出管１０の内空を洗浄できるよう、本体部１０１には蓋材１１を、また直交部１０２には噴出口付き蓋材１１１を設置している。 Further, when the excavation hole is deep enough to reach, for example, 50 m, fine particles M such as clay components enter the air ejection pipe 10 from the air outlet 12 due to water pressure, and the air outlet 12 is clogged. It is easy to occur. Therefore, a lid material 11 is installed on the main body 101, and a lid member 111 with a spout is installed on the orthogonal portion 102 so that the inner space of the air ejection pipe 10 can be cleaned.

具体的には、エア噴出管１０の使用後に、先に述べた図２で示す脚部材１７を利用してエアブロー撹拌装置１を地表面や架台上等に載置し、これら蓋材１１および噴出口付き蓋材１１１を取り外す。すると、図９で示すように、本体部１０１と直交部１０２には管径と略等しい口径の開口が備えられているから、この開口を利用して内空を水等で洗浄し、粘土成分等の細粒分Ｍを排出すればよい。これにより、エア噴出口１２の目詰まりを除去してエア噴出機能を回復させることかできる等、エア噴出管１０のメンテナンスを容易に行うことが可能となる。 Specifically, after using the air ejection pipe 10, the air blow agitator 1 is placed on the ground surface, a gantry, or the like by using the leg member 17 shown in FIG. 2 described above, and the lid material 11 and the jet are ejected. Remove the lid member 111 with an outlet. Then, as shown in FIG. 9, since the main body 101 and the orthogonal portion 102 are provided with an opening having a diameter substantially equal to the pipe diameter, the inner air is washed with water or the like using this opening, and the clay component is used. It is sufficient to discharge the fine-grained portion M such as. As a result, maintenance of the air ejection pipe 10 can be easily performed, for example, the clogging of the air ejection port 12 can be cleared and the air ejection function can be restored.

なお、このようなメンテナンス作業は、先に図２で示した円筒状のエア噴出管１０についても、両端部に備えた蓋材１１を取り外すことにより実施できることは言うまでもない。 Needless to say, such maintenance work can also be performed on the cylindrical air ejection pipe 10 shown in FIG. 2 by removing the lid members 11 provided at both ends.

そして、本実施の形態では、図２で示した円筒状のエア噴出管１０の両端部にそれぞれ蓋材１１を設置しているが、必ずしもこれに限定するものではなく、孔壁と近接する側の端部にエア噴出口１２を備えた噴出口付き蓋材１１１を設置してもよい。同様に、図８で示したＴ字状をなすエア噴出管１０の直交部１０２に対して、噴出口付き蓋材１１１に替えてエア噴出口１２を備えない蓋材１１を設置してもよい。 In the present embodiment, lid members 11 are installed at both ends of the cylindrical air ejection pipe 10 shown in FIG. 2, but the present invention is not necessarily limited to this, and the side close to the hole wall is provided. A lid member 111 with an outlet provided with an air outlet 12 may be installed at the end of the. Similarly, for the orthogonal portion 102 of the T-shaped air ejection pipe 10 shown in FIG. 8, a lid material 11 having no air outlet 12 may be installed in place of the lid material 111 with an outlet. ..

また、本実施の形態では、支柱２を構成する棒状部材３、張出し部材９を構成する下張出し部材９２にＨ形鋼を、張出し部材９を構成する上張出し部材９１に溝形鋼を、および緩衝部材１５に設けた接合部材１６を構成する上接合部材１６１および下接合部材１６２に山形鋼をそれぞれ採用したが、必ずしもこれに限定するものではなく、ボルト穴を形成可能な鋼材であれば、いずれを採用してもよい。 Further, in the present embodiment, the rod-shaped member 3 constituting the support column 2, the lower overhanging member 92 forming the overhanging member 9 is made of H-shaped steel, the upper overhanging member 91 forming the overhanging member 9 is made of channel steel, and the like. Angle steel is used for the upper joining member 161 and the lower joining member 162 that form the joining member 16 provided on the cushioning member 15, but the present invention is not necessarily limited to this, and any steel material capable of forming bolt holes can be used. Either may be adopted.

さらに、本実施の形態では、下張出し部材９２に対するエア噴出管１０の取り付け、および張出し部材９に対する接合部材１６の取り付けを、それぞれボルト１４による締結にて行っているが、必ずしもこれに限定されるものではなく、両者を着脱自在に取り付け可能であれば、他の手段を採用してもよい。 Further, in the present embodiment, the air ejection pipe 10 is attached to the underhanging member 92 and the joining member 16 is attached to the overhanging member 9 by fastening with bolts 14, but the present invention is not necessarily limited to this. Other means may be adopted as long as both of them can be detachably attached.

また、本実施の形態では、連結部材４のカバー部材７に、一対の平鋼板を採用したが、必ずしもこれに限定されるものではなく、例えばスリーブ等、端部どうしを突き合わせた状態で連続する隣り合う棒状部材３の両者に跨るようにして配置できる部材であれば、いずれを採用してもよい。 Further, in the present embodiment, a pair of flat steel plates is used for the cover member 7 of the connecting member 4, but the present invention is not necessarily limited to this, and the sleeves and the like are continuously formed with their ends abutted against each other. Any member may be adopted as long as it can be arranged so as to straddle both of the adjacent rod-shaped members 3.

１ エアブロー撹拌装置
２ 支柱
３ 棒状部材
４ 連結部材
５ エア供給管
６ かんざし筋
７ カバー部材
８ エア噴出器
９ 張出し部材
９１ 上張出し部材
９２ 下張出し部材
１０ エア噴出管
１０１ 本体部
１０２ 直交部
１１ 蓋材
１１１ 噴出口付き蓋材
１２ エア噴出口
１３ 設置部材
１４ ボルト
１５ 緩衝部材
１６ 接合部材
１６１ 上接合部材
１６２ 下接合部材
１７ 脚部材
Ｈ 掘削孔
Ｌ 液状体
Ｃ コンプレッサー
Ｍ 細粒分 1 Air blow agitator 2 Strut 3 Rod-shaped member 4 Connecting member 5 Air supply pipe 6 Kanzashi muscle 7 Cover member 8 Air ejector 9 Overhanging member 91 Overhanging member 92 Lower overhanging member 10 Air ejection pipe 101 Main body 102 Orthogonal part 11 Lid material 111 Lid with spout 12 Air spout 13 Installation member 14 Bolt 15 Cushioning member 16 Joining member 161 Upper joining member 162 Lower joining member 17 Leg member H Drilling hole L Liquid material C Compressor M Fine particles

Claims (2)

掘削孔に充填された液状体をエアブロー撹拌するための、エアブロー撹拌装置であって、
前記掘削孔内の深度方向に延在するよう挿入され、エア供給パイプが長手方向に沿って設置される支柱と、該支柱の下端に接合され、前記エア供給パイプから供給されたエアを噴出するエア噴出器とよりなり、
前記エア噴出器が、前記支柱から孔壁に向かって延在するように設置される複数の張出し部材と、該張出し部材各々に設置され、軸心が該張出し部材の延在方向と平行になるよう配置される複数のエア噴出管と、前記張出し部材各々に設置され、前記エア噴出管の孔壁と対向する面より孔壁に近接する位置に配置される複数の緩衝部材とを備え、
前記エア噴出管および前記緩衝部材がともに、前記張出し部材の延在方向に位置調整可能に設置されることを特徴とするエアブロー撹拌装置。 An air blow agitator for air blow agitation of the liquid material filled in the excavation hole.
It is inserted so as to extend in the depth direction in the drilling hole, and the air supply pipe is joined to the support column installed along the longitudinal direction and the lower end of the support column to eject the air supplied from the air supply pipe. Consisting with an air ejector
The air ejector is installed on each of a plurality of overhanging members installed so as to extend from the support column toward the hole wall, and the axis is parallel to the extending direction of the overhanging member. It is provided with a plurality of air ejection pipes arranged in such a manner and a plurality of cushioning members installed on each of the overhanging members and arranged at positions closer to the hole wall than the surface facing the hole wall of the air ejection pipe.
An air blow agitation device characterized in that both the air ejection pipe and the cushioning member are installed so that their positions can be adjusted in the extending direction of the overhanging member. 掘削孔に充填された液状体を、請求項１に記載のエアブロー撹拌装置にてエアブロー撹拌する、液状体のエアブロー撹拌方法であって、
前記エア噴出器を前記掘削孔内に配置した際に、前記エア噴出管が孔壁近傍に配置され、前記緩衝部材が前記エア噴出管の孔壁と対向する面より孔壁に近接した位置に配置されるよう、前記張出し部材に対する前記緩衝部材と前記エア噴出管の位置調整を地上にて行い、
前記エアブロー撹拌装置を前記掘削孔内に挿入して、前記エア噴出器を孔底近傍まで到達させた後、
該エア噴出器より前記液状体にエアを噴出させることを特徴とする液状体のエアブロー撹拌方法。 An air blow agitation method for a liquid material, wherein the liquid material filled in the excavation hole is air blow agitated by the air blow agitation device according to claim 1.
When the air ejector is arranged in the excavation hole, the air ejection pipe is arranged near the hole wall, and the buffer member is located closer to the hole wall than the surface of the air ejection pipe facing the hole wall. The positions of the cushioning member and the air ejection pipe with respect to the overhanging member are adjusted on the ground so as to be arranged.
After inserting the air blow agitator into the excavation hole to bring the air ejector close to the bottom of the hole,
An air blow stirring method for a liquid material, which comprises ejecting air from the air ejector onto the liquid material.

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