JP2017066855A - Air blow agitation device, air jet pipe and liquid air blow agitation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air blow agitation device, which can efficiently carry out air blow agitation of charged liquid body even if a cross section of a drilling hole formed underground has any shape or large diameter.SOLUTION: An air blow agitation device comprises: a brace 2, which is vertically inserted in a drilling hole; and an air jet device 8, which is connected with a lower edge of the brace 2. The air jet device 8 comprises: multiple overhanging members 9, which are installed so as to extend from the brace 2 toward a hole wall; multiple air jet pipes 10, which are installed on respective overhanging members 9 and disposed so that shaft centers of the air jet pipes are in parallel with the extending direction of the overhanging members 9; and multiple buffer members 15, which are installed on respective overhanging members 9 and disposed at positions nearer the hole wall than surfaces of the air jet pipes 10 facing the hole wall. The air jet pipes 10 and the buffer members 15 are disposed so that positioning in the extending direction of the overhang members 9 can be carried out.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an air blow stirring device, an air jet pipe, and an air blow stirring method for a liquid material, which are used for air blow stirring of a liquid material filled in an excavation hole provided in the ground.

  Conventionally, after the underground liquid has been formed by excavating the underground into a groove shape and supplying the stable liquid and protecting the groove wall with the stable liquid, the stable liquid in the underground groove is solidified by the solidifying material, 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 a stable liquid filling the groove can be used as it is.

  Specifically, for example, in Patent Document 1, after a solidifying material is introduced into a groove filled with the in-groove stabilizing liquid, the solidifying material and the in-groove stabilizing liquid are stirred by air blow stirring using an air hose, A method of solidifying and building underground walls is disclosed. Further, in Patent Document 2, a steel pipe is built in a grooved excavation hole filled with muddy water, air blow stirring is performed by feeding air through the steel pipe, and the muddy water and cement are stirred and then solidified. A method is disclosed.

JP 2003-268863 A Japanese Patent Laid-Open No. 9-13373

  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 the plan view, so that a plurality of air jet outlets are arranged in the longitudinal direction of the excavation groove. The entire inside of the groove can be evenly blown with air. However, if the excavation hole is, for example, a large-diameter cylindrical or polygonal column, it is necessary to install an air outlet so as to cover the entire excavation hole in plan view. The amount of air used is excessive, and a high-output compressor is required.

  The present invention has been made in view of such problems, and its main purpose is to improve the efficiency of the filled liquid material regardless of the cross-sectional shape and the diameter of the excavation hole provided in the ground. Provided are an air blow stirring device, an air ejection pipe and a method for air blow stirring of a liquid material, which can perform air blow stirring well and inexpensively.

  In order to achieve such an object, the air blow agitator according to the present invention is an air blow agitator for air blow agitating a liquid filled in an excavation hole, and is inserted so as to extend in the depth direction in the excavation hole. A support column in which the air supply pipe is installed along the longitudinal direction; and an air sprayer that is joined to a lower end of the support column and jets 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 air installed in each of the overhanging members and arranged so that the axis is parallel to the extending direction of the overhanging member A jet pipe, and a plurality of buffer members disposed on each of the overhanging members and positioned closer to the hole wall than a surface facing the hole wall of the air jet pipe, the air jet pipe and the buffer member But Moni, characterized in that it is installed adjustably in the extending direction of the projecting member.

  According to the air blow agitation device 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 diameter of the excavation hole. As a result, the air ejected from the air ejection pipe into the liquid material moves upward in the depth direction along the hole wall without diffusing, so that the liquid material staying in the vicinity of the hole bottom 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 falls near the hole opening toward the hole bottom. Therefore, by arranging a plurality of air ejection pipes extending from the support column toward the hole wall in an appropriate plan view position in the vicinity of the hole wall and according to the cross-sectional shape of the drilling hole, the number of air ejection pipes can be reduced. It becomes possible to generate a circulating flow in the depth direction efficiently and inexpensively over the entire area of the excavation hole.

  In addition, since the buffer member is disposed at a position closer to the hole wall from the surface facing the hole wall of the air ejection pipe, the air blow agitator is installed in the air blow agitator during the construction work of the air blow agitator. On the other hand, even if an unexpected lateral force is applied, the shock-absorbing member can prevent the air jet tube from colliding with the hole wall, so that the air jet tube can be prevented from being damaged.

  The air blow stirring method for a liquid material according to the present invention is an air blow stirring method for a liquid material in which a liquid material filled in an excavation hole is air blow stirred with the air blow stirring device according to the present invention. The overhanging member so that the air ejection pipe is disposed in the vicinity of the hole wall when disposed inside, and the buffer member is disposed at a position closer to the hole wall than a surface facing the hole wall of the air ejection pipe. After adjusting the position of the buffer member and the air ejection pipe with respect to the ground, inserting the air blow agitator into the excavation hole and allowing the air ejector to reach the vicinity of the hole bottom, the air ejector Further, air is jetted into the liquid material.

  According to the air blow stirring method of the liquid material of the present invention, the position adjustment operation of the buffer member and the air ejection pipe with respect to the overhanging member is performed on the ground, and the air ejector is configured to have a cross-sectional shape and a diameter of a drilling hole. Therefore, the air blow agitation can be performed efficiently and reliably on the liquid material in the excavation hole, and the work efficiency related to the air blow agitation can be greatly improved.

  An air ejection pipe of the present invention comprises a plurality of air ejection ports installed on a peripheral surface, an opening provided at or near an end, and a detachable lid member that closes the opening. And

  According to the air ejection pipe of the present invention, by providing a plurality of air ejection ports, the liquid material staying near the hole bottom is raised, and the liquid material near the hole mouth is lowered toward the hole bottom. Air that generates such 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 cover is provided, by removing the cover, the opening is used to remove fine particles such as clay stored in the air ejection pipe with water. It is possible to easily perform maintenance, for example, by cleaning the air outlet to remove clogging of the air outlet and restoring the air ejection function.

  According to the present invention, the air jet pipe can be arranged in the vicinity of the hole wall to generate a circulating flow in the depth direction regardless of the shape or the large diameter of the excavation hole. By arranging multiple jet pipes in the vicinity of the hole wall and in an appropriate plan view position according to the cross-sectional shape of the drilling hole, a circulation flow in the depth direction can be generated throughout the drilling hole, and excavation in the ground It becomes possible to air-blow and stir the liquid filling the holes efficiently and inexpensively with a small number of air ejection pipes.

It is a figure which shows the outline of the air blow stirring apparatus in this invention. It is a figure which shows the detail of the air ejector of the state which protruded the air injection pipe in this invention. It is a figure which shows the lower surface of the air ejector of the state which protruded the air injection pipe in this invention. It is a figure which shows the detail of the air ejector of the state which accommodated the air injection pipe in this invention. It is a figure which shows the lower surface of the air ejector of the state which accommodated the air injection pipe in this invention. It is a figure which shows a mode that the liquid body in this invention is air blow-stirred. It is a figure which shows other embodiment of the air injection pipe in this invention. It is a figure which shows the aspect of other embodiment of the air injection pipe in this invention. It is a figure which shows the mode of washing | cleaning of the air injection pipe in this invention.

  The air blow stirring device of the present invention performs air blow stirring on the entire liquid filling the drill hole even if the drill hole provided in the ground has a large diameter exceeding 3 m, for example, and a large depth exceeding 20 m. It is a possible device.

In this embodiment, the 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. Moreover, any of a stable liquid, a mixture of a stable liquid and a muddy water solidifying material, or the like may be adopted as a liquid material to be subjected to air blow stirring.
Below, the air blow stirring apparatus of this invention is demonstrated with reference to FIGS.

  As shown in FIG. 1, the air blow stirrer 1 includes a support column 2 that is inserted so as to extend in the depth direction in a drilling hole H formed in the ground, and an air ejector that is joined to the lower end of the support column 2. 8. The depth direction includes a vertical direction and a substantially vertical direction.

  The support | pillar 2 is provided with the some rod-shaped member 3 and the connection member 4 for connecting the rod-shaped member 3 to a longitudinal direction. The rod-shaped member 3 is a member having a space in which the air supply pipe 5 can be accommodated along the longitudinal direction, and H-shaped steel is adopted in the present embodiment. Further, as shown in an enlarged manner in FIG. 1, the connecting member 4 includes two knurled bars 6 and a pair of cover members 7.

  The cover member 7 is made of a pair of flat steel plates, and is arranged so as to straddle both adjacent rod-like members 3 arranged in the longitudinal direction in a state where the end portions are butted together, and sandwich the rod-like member 3 therebetween. Has been. The adjacent bar-shaped members 3 are each provided with a through-hole (not shown) at a height position where the cover member 7 is arranged, and the cover member 7 is not shown in a position facing the through-hole of the bar-shaped member 3. A pin hole is provided. Thus, the rods 6 are passed through the through holes of the adjacent bar members 3 and the pin holes of the cover member 7 so that the adjacent bar members 3 are connected to each other to form the column 2.

  On the other hand, as shown in FIG. 2, the air ejector 8 includes a plurality of projecting members 9, an air ejection pipe 10 installed on each of the projecting members 9, and a buffer member 15 installed on each of the projecting members 9, A leg member 17 for mounting the air blow agitator 1 on the ground surface, a gantry or the like.

  As shown in FIG. 2, the overhang member 9 is installed at the lower end portion of the column 2 and the upper overhang member 91 made of a pair of channel steels so as to sandwich the column 2 above the lower end portion of the column 2. Further, an underhanging member 92 made of H-shaped steel is provided, both of which are installed so as to extend in the same direction from the support column 2 toward the hole wall. In addition, a plurality of bolt holes (not shown) are formed on the upper surface of the upper projecting member 91 and the upper and lower surfaces of the lower projecting member 92 with a space in the longitudinal direction. In the present embodiment, as shown in FIG. 3, four projecting members 9 having such a configuration are arranged radially at intervals of 90 degrees. However, the quantity and the arrangement position are not limited to this, and can be appropriately increased or decreased according to the diameter or cross-sectional shape of the excavation hole H.

  As shown in FIG. 2, the air ejection pipe 10 is configured by a cylindrical member whose both ends are each closed by a detachable lid member 11, and a plurality of air jet pipes 10 are provided along the axial direction on the peripheral surface. The air outlet 12 is provided. In addition, the air ejection pipe 10 is disposed below the lower extension member 92 in a posture in which the axis is parallel to the extending direction of the lower extension member 92, and is connected to the air supply pipe on the lid member 11 positioned in the vicinity of the column 2. The tip of 5 is connected. The base end of the air supply pipe 5 is connected to the compressor C as shown in FIG. 1, so that the air supplied from the air supply pipe 5 to the air jet pipe 10 is supplied from the air jet outlet 12 to the liquid L Will be ejected.

  When the air ejection pipe 10 is attached to the lower extension member 92, the installation member 13 for attaching the air ejection pipe 10 to the lower extension member 92 is provided. The bolt hole and the bolt hole provided in the installation member 13 of the air ejection pipe 10 are aligned and fastened by the bolt 14.

  In this way, the air ejection pipe 10 attached to the lower overhanging member 92 is connected to the bolt hole at a position separated from the column 2 and the installation member 13 of the air ejection pipe 10 among the plurality of bolt holes provided in the lower surface of the lower overhanging member 92. When the provided bolt holes are aligned and fastened with the bolts 14, as shown in FIGS. 2 and 3, they can be protruded from the lower projecting member 92 toward the hole walls.

  Further, among the plurality of bolt holes provided on the lower surface of the lower projecting member 92, the bolt hole located in the vicinity of the column 2 and the bolt hole provided in the installation member 13 of the air ejection pipe 10 are aligned, and the bolt 14 By fastening, as shown in FIG. 4 and FIG. 5, the air ejection pipe 10 can be housed below the lower projecting member 92. In this way, by adjusting the mounting position of the air ejection pipe 10 with respect to the lower projecting member 92 according to the diameter and 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.

  As shown in FIG. 3, the buffer member 15 is formed of a plate-like member whose surface is formed in an arc shape along the hole wall surface of the excavation hole H. As shown in FIG. is set up. The joining member 16 includes an upper joining member 161 and a lower joining member 162 that are attached to the back surface of the buffer member 15 while shifting the height position. These are made of angle steel having a plurality of bolt holes (not shown) in the longitudinal direction, and the upper joint member 161 is placed on the upper surface of the upper overhanging member 91 in a posture in which the axis is parallel to the extending direction of the overhanging member 9. The lower joining members 162 are respectively disposed on the upper surface of the lower projecting member 92.

  When the buffer member 15 is attached to the overhang member 9, as described above, since the bolt holes (not shown) are provided on the upper surfaces of the upper overhang member 91 and the lower overhang member 92, the upper joint member The bolt hole provided in 161 and the bolt hole provided in the upper overhanging member 91 are aligned, and the bolt hole provided in the lower bonding member 162 and the bolt hole provided in the lower overhanging member 92 are aligned, and then the bolt 14 It is concluded by.

  At this time, as shown in FIG. 2, the mounting position of the buffer member 15 with respect to the overhang member 9 is such that the surface of the buffer member 15 is always on the hole wall side with respect to the cover material 11 that is a surface facing 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 positioned at the positions.

  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 with an opening surface facing the extending direction of the lower extension member 92. And it is detachably installed in a mode that encloses the air ejection pipe 10 through a bolt hole provided on the lower surface of the lower overhang member 92.

  The usage method of the air blow stirring apparatus 1 of the structure mentioned above is shown below.

  First, the mounting positions of the air ejection pipe 10 and the buffer member 15 with respect to the extension member 9 are set according to the cross-sectional shape and the diameter of the borehole H so that the air ejection pipe 10 is disposed in the vicinity of the hole wall of the borehole H. After confirming, the mounting 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 of the excavation hole H and the diameter. At this time, since the leg member 17 is provided in the lower overhang member 92, the position adjustment work of the air ejection pipe 10 and the buffer member 15 can be performed in a state where the air blow stirring device 1 is placed on the ground. .

  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-like member 3 is inserted into the excavation hole H while being connected by the connecting member 4 until the air ejector 8 reaches the vicinity of the bottom of the excavation hole H. When the air blow agitator 1 is installed, even if an unexpected lateral force is applied to the air blow agitator 1, the buffer member 15 comes into contact with the hole wall in advance to protect the air ejection pipe 10. The air ejector 8 is not damaged.

  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 through the air supply pipe 5, and air is ejected from the air ejection outlet 12 to form a liquid material in the excavation hole H. L is air blow stirred.

  By arranging the air ejection pipe 10 in the vicinity of the hole wall, the air that is blown up from the air outlet 12 is restricted in the moving direction by the hole wall, and moves upward in the depth direction along the hole wall without diffusing. To do. Accordingly, as shown in FIG. 6, the liquid L staying in the vicinity of the hole bottom rises along with the air along the hole wall toward the pile mouth, and the liquid L in the vicinity of the hole mouth reaches the hole bottom. A circulating flow in the depth direction that descends toward the bottom is generated. In the present embodiment, since four air ejection pipes 10 extending from the support 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 Therefore, the liquid L filled in the excavation hole H is efficiently stirred.

  As described above, by arranging a plurality of the air ejection pipes 10 in the vicinity of the hole wall and in an appropriate plan view position corresponding 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. Therefore, the liquid L that fills the excavation hole H in the ground can be efficiently and efficiently air-blown with a small number of the air jet pipes 10 at a low cost.

  Needless to say, the air blow stirring device 1 of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the present embodiment, the air ejection pipe 10 is formed of a cylindrical member, but is not necessarily limited to this, and as shown in FIG. 7, the side of the cylindrical member facing the hole wall You may employ | adopt what was formed in the external shape which makes | forms the T shape which combined the other cylindrical member at the end so that it might orthogonally cross. Also in this case, the buffer member 15 is disposed at a position closer to the hole wall than the surface facing the hole wall of the T-shaped air ejection pipe 10.

  Specifically, as shown in FIG. 7, a T-shaped air ejection pipe 10 is constituted by a main body portion 101 parallel to the overhang member 9 and an orthogonal portion 102 orthogonal to the main body portion 101, Communicate. The main body 101 is made of a cylindrical member, and the end located on the center side of the excavation hole H is closed.

  As shown in FIGS. 8 (a) and 8 (b), the peripheral surface of the main body 101 is provided with a plurality of air jets 12 along the axial direction, and an end located on the center side of the excavation hole H. An opening is provided at a position close to the cover 11, and a lid member 11 is detachably installed so as to close the opening. This opening is sufficiently larger than the air outlet 12 and has a diameter that is substantially equal to or slightly smaller than the tube diameter of the main body 101. On the other hand, the orthogonal part 102 is also made of a cylindrical member, and both ends thereof are opened, and a lid member 111 with an ejection port provided with an air ejection port 12 is detachably installed so as to close the opening.

  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. The liquid material L is ejected not only from 101 but also from the air ejection port 12 of the lid member 111 with the ejection port provided in the orthogonal part 102. Accordingly, air is also ejected from the space formed between the T-shaped air ejection pipes 10 that are closest to and adjacent to the hole wall, and moves upward in the depth direction along the hole wall.

  Thereby, the liquid L staying in the vicinity of the hole bottom previously shown in FIG. 6 rises toward the pile mouth along the hole wall together with air, and the liquid L in the vicinity of the hole toward the hole bottom. The circulating flow in the depth direction as descending can be generated more efficiently over the entire area of the excavation hole H.

  In addition, when the depth of the excavation hole reaches 50 m, for example, fine particles M such as clay components enter the air ejection pipe 10 from the air ejection port 12 due to water pressure, and the air ejection port 12 is clogged. Prone to occur. Therefore, a lid 11 is installed in the main body 101 and a lid 111 with a jet outlet is installed in the orthogonal part 102 so that the inner space of the air ejection pipe 10 can be cleaned.

  Specifically, after the air ejection pipe 10 is used, the air blow agitator 1 is placed on the ground surface or a frame using the above-described leg member 17 shown in FIG. Remove the cover 111 with the outlet. Then, as shown in FIG. 9, since the body portion 101 and the orthogonal portion 102 are provided with an opening having a diameter substantially equal to the tube diameter, the inside air is washed with water or the like using this opening, and the clay component What is necessary is just to discharge | emit the fine grain part M, such as. Thereby, it becomes possible to easily perform maintenance of the air ejection pipe 10, such as removing the clogging of the air ejection port 12 and recovering the air ejection function.

  Needless to say, such a maintenance operation can also be performed on the cylindrical air ejection pipe 10 shown in FIG.

  And in this Embodiment, although the cover material 11 is each installed in the both ends of the cylindrical air ejection pipe | tube 10 shown in FIG. 2, it is not necessarily limited to this, The side close | similar to a hole wall You may install the cover material 111 with a jet nozzle provided with the air jet nozzle 12 in the edge part. Similarly, a lid member 11 that does not include the air ejection port 12 may be installed on the orthogonal portion 102 of the air ejection pipe 10 having the T shape shown in FIG. .

  Further, in the present embodiment, the rod-shaped member 3 constituting the support 2, the H-shaped steel is formed on the lower projecting member 92 constituting the projecting member 9, the channel steel is formed on the upper projecting member 91 configuring the projecting member 9, and Although the angle steel was each employ | adopted for the upper joining member 161 and the lower joining member 162 which comprise the joining member 16 provided in the buffer member 15, it is not necessarily limited to this, If it is a steel material which can form a bolt hole, Either may be adopted.

  Furthermore, in this embodiment, the attachment of the air ejection pipe 10 to the lower overhanging member 92 and the attachment of the joining member 16 to the overhanging member 9 are performed by fastening with the bolts 14, respectively, but this is not necessarily limited thereto. Other means may be adopted as long as both can be detachably attached.

  Moreover, in this Embodiment, although a pair of flat steel plate was employ | adopted for the cover member 7 of the connection member 4, it is not necessarily limited to this, For example, it continues in the state which face | matched edge parts, such as a sleeve Any member may be employed as long as it is a member that can be disposed so as to straddle both adjacent rod-shaped members 3.

DESCRIPTION OF SYMBOLS 1 Air blow stirring apparatus 2 Support | pillar 3 Rod-shaped member 4 Connecting member 5 Air supply pipe 6 Hairpin 7 Cover member 8 Air ejector 9 Overhang member 91 Upper overhang member 92 Lower overhang member 10 Air ejection pipe 101 Main body part 102 Orthogonal part 11 Lid material 111 Lid with Jet 12 Air Jet 13 Installation Member 14 Bolt 15 Buffer 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 (3)

An air blow stirring device for air blowing stirring of a liquid filled in a drilling hole,
Inserted so as to extend in the depth direction in the excavation hole, a support column in which the air supply pipe is installed along the longitudinal direction, and a lower end of the support column are joined, and the air supplied from the air supply pipe is ejected. With air blower,
The air ejector is installed on each of the projecting members so as to extend from the support column toward the hole wall, and the shaft center is parallel to the extending direction of the projecting member. A plurality of air ejection pipes arranged in such a manner, and a plurality of cushioning members installed in each of the overhanging members and arranged closer to the hole wall than a surface facing the hole wall of the air ejection pipe,
The air blow agitating device, wherein both the air ejection pipe and the buffer member are installed so that their positions can be adjusted in the extending direction of the extending member. An air blow stirring method for a liquid material, wherein the liquid material filled in the excavation hole is air blow stirred with the air blow stirring device according to claim 1,
When the air ejector is disposed in the excavation hole, the air ejection pipe is disposed in the vicinity of the hole wall, and the buffer member is located closer to the hole wall than the surface facing the hole wall of the air ejection pipe. To adjust the position of the buffer member and the air ejection pipe with respect to the overhang member on the ground,
After inserting the air blow agitator into the excavation hole and allowing the air ejector to reach the vicinity of the hole bottom,
An air blow stirring method for a liquid material, characterized in that air is ejected from the air ejector into the liquid material. An air jet pipe for air blow stirring the liquid filled in the drilling hole,
An air ejection pipe comprising: a plurality of air ejection ports installed on a peripheral surface; an opening provided at or near an end; and a detachable lid that closes the opening.

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