JP2017141548A - Deep layer mixing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deep layer mixing apparatus which can establish a desired columnar improvement body easily by dissolving excessive pressure generated in an agitation mixing part as excess pressure and reducing displacement applied to the side part.SOLUTION: A deep layer mixing apparatus that forms a columnar improvement body by injecting and agitating a solidification material in a soft ground comprises: a rod 20 which has a middle pipe with an excavation tooth 23 and a solidification material discharge port at the lowermost end part and an outer pipe installed outside the middle pipe and which rotationally drives the middle pipe and the outer pipe in the contrary direction mutually; an agitation mixing part 26 which has a middle pipe agitating blade 27 installed at the lower end of the rod 20 and rotating integrally with the middle pipe and an outer pipe agitating blade 28 rotating integrally with the outer pipe and which agitates and mixes an excavated ground and a solidification material; and an outer pipe spiral blade 30 which is installed in the outer peripheral surface of the outer pipe so as to rotate integrally with the outer pipe and which guides to the upper part in a longer direction of the rod 20 a part of excessive pressure generated by in-situ soil and an injected solidification material mixed in the agitation mixing part 26 for dissipation.SELECTED DRAWING: Figure 13

Description

  The present invention relates to a deep mixing processing apparatus, and more particularly to a deep mixing processing apparatus that forms a cylindrical improvement body by injecting and stirring a solidified material into soft ground.

  Conventionally, in the deep mixing treatment method in which a solidified material is injected and stirred into soft ground to form a cylindrical improvement body, a drilling tooth and a solidified material discharge port are provided at the lowermost end portion of the rod, and at the lower end portion of the rod. Many stirring devices having a plurality of stirring blades are used. Then, when creating the improved ground (columnar improved body), while driving the excavating teeth to penetrate into the original ground, the slurry-like solidified material is discharged from the solidified material discharge port, and the stirring blades are rotated. The solidified material and excavated soil (original soil) are stirred and mixed by moving the rod up and down to create an improved ground (columnar improved body) (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2008-57255.

  However, in the invention described in Patent Document 1, slurry-like solidified material is discharged from the solidified material discharge port while rotating the excavating teeth and penetrating into the original ground, and by rotating the stirring blade and moving the rod up and down. The improved ground (cylindrical improved body) is created by stirring and mixing the solidified material and excavated soil, but since the stirring and mixing part has vertical blades and has a bowl shape, the solidified material discharged from the rod tip When (cement slurry) is agitated and mixed with the in-situ soil that has been taken into the bowl-shaped stirring and mixing section and excavated, excess pressure tends to be generated in the bowl-shaped stirring and mixing section. Therefore, normally, the excessive pressure is not dissipated in the ground but stays in the ground, so it is distributed to push the surrounding ground around the improved ground (columnar shaped improved body) created Because of this situation, the pressure causes a ground displacement in the lateral direction. In addition, there are not a few cases where a uniform improved body cannot be created because the solidified material or excavated soil becomes rough and dense due to the movement of pressure, resulting in unevenness.

  Therefore, to provide a deep mixing treatment apparatus that can easily create a desired cylindrical improved body while eliminating excessive pressure generated in the stirring and mixing section as excess pressure and reducing displacement applied to the side. Therefore, a technical problem to be solved arises, and the present invention aims to solve this problem.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is the most suitable in a deep mixing treatment apparatus in which a solidified material is injected and stirred into a soft ground to form a cylindrical improvement body. It has a middle pipe provided with excavating teeth and a solidifying material discharge port at its lower end and an outer pipe mounted on the outer side of the middle pipe, and the middle pipe and the outer pipe are driven to rotate in directions opposite to each other. A rod, an intermediate tube agitating blade that is provided at a lower end portion of the rod and rotates integrally with the intermediate tube, and an outer tube agitating blade that rotates integrally with the outer tube; Agitated and mixed portion for agitating and mixing the solidified material, and provided on the outer peripheral surface of the outer tube so as to rotate integrally with the outer tube, and generated by the in situ soil mixed in the agitated and mixed portion and the injected solidified material. Surplus pressure dissipator capable of guiding a part of excessive pressure upward in the longitudinal direction of the rod When, it provides Deep Mixing apparatus comprising a.

  According to this configuration, excessive pressure generated by mixing the excavated ground and the solidified material in the agitation and mixing unit that is inserted into the excavation hole together with the rod is in situ in the agitation and mixing unit. A part of the excess pressure generated by the injected solidified material is dissipated by escape by being guided upward in the longitudinal direction of the rod (outer tube) by the surplus pressure dissipating means provided on the outer peripheral surface of the outer tube. The The excess pressure generated by the in-situ soil mixed in the stirring and mixing unit and the injected solidified material is released upward in the longitudinal direction of the rod, so that the pressure in the drilling hole is reduced, and It is possible to reduce the amount of excessive pressure generated by the in-situ soil and the injected solidified material soaked around the excavation hole. This makes it possible to create a desired cylindrical improvement. Furthermore, since the inner tube agitating blade rotating integrally with the inner tube and the outer tube agitating blade rotating integrally with the outer tube are driven to rotate in directions opposite to each other, the circulation of the mixed soil is suppressed during agitation, and the agitating blade The mixed soil existing between or around the three-dimensionally interchanges in both the upper, lower, left and right directions, and uniform stirring and mixing can be performed.

  According to a second aspect of the present invention, in the configuration according to the first aspect, the surplus pressure dissipating means includes a spiral wing that is continuously wound in the longitudinal direction of the outer tube. A mixed processing apparatus is provided.

  According to this configuration, when excessive pressure is generated in the stirring and mixing unit, an excessive amount generated by the in situ soil in the stirring and mixing unit and the solidified material injected by the spiral blades provided on the outer peripheral surface of the outer tube. A part of the pressure is not forcedly forced upward in the longitudinal direction of the outer tube, but is escaped by being guided in an auxiliary manner, and the excess pressure in the stirring and mixing unit is dissipated as an excess pressure.

  According to a third aspect of the present invention, in the configuration according to the first aspect, the excessive pressure dissipation means is a spiral wing formed continuously in the longitudinal direction of the outer tube and changing the winding pitch in the middle. A deep-mixing processing apparatus is provided.

  According to this configuration, when surplus pressure is generated in the stirring and mixing unit, it is injected with the in-situ soil in the stirring and mixing unit by the spiral blades provided on the outer peripheral surface of the outer pipe while changing the winding pitch. A part of the excess pressure generated by the solidified material is not forced upward in the longitudinal direction of the outer tube, but is evacuated by being guided with the discharge speed being discontinuously supplemented, and stirred. Excess pressure in the mixing section is dissipated as excess pressure.

  According to a fourth aspect of the present invention, in the configuration according to the first aspect, the surplus pressure dissipating means includes a spiral wing that is continuously wound in a longitudinal direction of the outer tube, and a length of the outer tube. Provided is a deep mixing treatment apparatus provided intermittently with respect to a direction.

  According to this configuration, when surplus pressure is generated in the stirring and mixing unit, it is injected into the in-situ soil in the stirring and mixing unit by a spiral blade that is continuously wound in the longitudinal direction on the outer peripheral surface of the outer tube. A part of the excess pressure generated by the solidified material is not forcedly forced upward in the longitudinal direction of the outer pipe, but is released by auxiliary guidance, and the excess pressure in the stirring and mixing section is surplus pressure. Dissipate as.

  Invention of Claim 5 is formed in the structure of Claim 1 by the wing | blade each arrange | positioned intermittently with respect to the longitudinal direction of the said outer tube | pipe, and each exhibiting a wave in side view, A deep mixing apparatus is provided.

  According to this configuration, when excessive pressure is generated in the stirring and mixing section, a plurality of blades are intermittently disposed on the outer peripheral surface of the outer tube in the longitudinal direction, and each of them is stirred and mixed by the blades that show undulations in a side view. A part of the excess pressure generated by the in-situ soil in the section and the injected solidified material is not forcedly forced upward in the longitudinal direction of the outer pipe, but is released by auxiliary guidance, stirring and mixing Excess pressure in the section is dissipated as excess pressure.

  A sixth aspect of the present invention provides the deep mixing apparatus according to the first aspect, comprising a rod-shaped wing formed substantially linearly along the axis of the outer tube.

  According to this configuration, when surplus pressure is generated in the stirring and mixing unit, it is injected into the in-situ soil in the stirring and mixing unit by the rod-shaped blades provided substantially linearly along the axial center on the outer peripheral surface of the outer tube. A part of the excess pressure generated by the solidified material is not forcedly forced upward in the longitudinal direction of the outer pipe, but is released by auxiliary guidance, and the excess pressure in the stirring and mixing section is surplus pressure. Dissipate as.

  A seventh aspect of the present invention is the deep mixing apparatus according to the first, second, third, fourth, fifth or sixth aspect, wherein the inner tube is rotated at a lower speed than the outer tube. I will provide a.

  According to this configuration, the middle tube agitating blade that rotates integrally with the middle tube and the outer tube agitating blade that rotates integrally with the outer tube are rotated in directions opposite to each other and at different speeds. In-situ soil and injected solidified material are restrained from rotating, and at the same time, the in-situ soil existing between or around the stirring blades and the injected solidified material are three-dimensionally switched in both the top, bottom, left and right directions. Stir mixing is promoted. In addition, the middle tube agitating blade that rotates slowly can be set to a larger torque than the outer tube agitating blade that rotates quickly.

  The invention according to claim 8 is the configuration according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the inner tube and the outer tube are respectively connected by connecting a plurality of pipe materials. In addition, the present invention provides a deep mixing processing apparatus in which the connecting position between the intermediate tubes and the connecting position between the outer tubes are set to be shifted in the longitudinal direction of the pipe material.

  According to this configuration, the connecting position between the intermediate tubes and the connecting position between the outer tubes are shifted in the longitudinal direction of the pipe material, and the intermediate tube and the outer tube are rotated in directions opposite to each other. Even if the part or / and the connecting part of the outer pipes are slightly bent, when the middle pipe and the outer pipe are rotated, the middle pipe and the outer pipe are bent in the vertical direction. Continue rotating while correcting. Thereby, the perpendicularity (linearity) of the connection position of the middle pipes and the connection position of the outer pipes can be ensured. By the way, when the connecting position of the middle pipes and the connecting position of the outer pipes are set to the same position in the longitudinal direction of the pipe material, when the middle pipe and the outer pipe are rotated, the bent state is maintained. Continue rotating in the same state.

  A ninth aspect of the present invention is the structure according to the first, second, third, fourth, fifth, sixth, seventh, or eighth aspect, wherein the stirring blade is formed in a rectangular shape in side view. In addition, there is provided a deep mixing processing apparatus having a drilling tooth on the lower surface side, and the outer tube agitating blade being disposed so as to be horizontally rotatable within a rotation range of the middle tube agitating blade.

  According to this configuration, when the middle tube agitating blade formed in a rectangular shape and the outer tube agitating blade that rotates horizontally within the rotation range of the middle tube agitating blade rotate in directions opposite to each other, The in-situ soil existing around and the injected solidified material are three-dimensionally switched in both the upper, lower, left and right directions, and stirring and mixing are further promoted. Further, when the middle tube agitating blade rotates, excavation is simultaneously performed with the excavating teeth provided on the lower surface side of the middle tube agitating blade.

  A tenth aspect of the present invention is the outer peripheral surface of the lower end portion of the middle pipe connected to the middle pipe stirring blade in the configuration of the first, second, third, fourth, fifth, sixth, seventh, eighth, or ninth aspect. Furthermore, the present invention provides a deep-mixing processing apparatus in which a middle pipe spiral blade is provided so as to fill a gap with the inner peripheral surface of the outer pipe.

  According to this configuration, the middle tube spiral blade provided on the outer circumferential surface of the middle tube is disposed so as to fill the gap between the inner circumferential surface of the outer tube. Therefore, the middle tube spiral blade prevents the in-situ soil that escapes from the inside of the stirring and mixing unit in the longitudinal direction of the rod due to excess pressure and a part of the injected solidified material from entering the gap between the middle tube and the outer tube. it can.

  The invention according to claim 11 is the configuration according to claim 9 or 10, wherein the outer tube agitating blade includes a first outer tube agitating blade disposed in the middle tube agitating blade, and the middle tube agitating blade. And a second outer tube agitating blade disposed on the outer side of the middle tube agitating blade, and provided with a deep mixing processing device provided with excavating teeth on the upper surface side of the second outer tube agitating blade To do.

  According to this configuration, the first outer tube stirring blade disposed in the middle tube stirring blade and the second outer tube stirring disposed above the middle tube stirring blade outside the middle tube stirring blade. By rotating the blade and the middle tube stirring blade in directions opposite to each other, the in-situ soil existing between or around the stirring blades and the injected solidified material are three-dimensionally switched in both the upper, lower, left and right directions and stirred. Mixing is further promoted. Further, when the second outer tube stirring blade rotates, excavation is simultaneously performed at the time of extraction with the excavating teeth provided on the upper surface side of the second outer tube stirring blade.

  The invention according to claim 12 is the configuration according to claim 9 or 10, wherein the outer tube agitating blade includes a first outer tube agitating blade disposed in the middle tube agitating blade, and the middle tube agitating blade. And a second outer tube agitating blade disposed below the middle tube agitating blade, and provided with a deep mixing treatment apparatus provided with drilling teeth on the lower surface of the second outer tube agitating blade .

  According to this configuration, the first outer tube stirring blade disposed in the middle tube stirring blade and the second outer tube stirring disposed outside the middle tube stirring blade and below the middle tube stirring blade. By rotating the blades and the middle tube stirring blades in directions opposite to each other, the in-situ soil existing between or around the stirring blades and the injected solidified material are three-dimensionally switched in both the upper, lower, left and right directions. Furthermore, stirring and mixing are promoted. Further, when the second outer pipe stirring blade rotates, excavation is simultaneously performed with the drilling teeth provided on the lower surface side of the second outer pipe stirring blade.

  According to a thirteenth aspect of the present invention, in the configuration according to the eleventh or twelfth aspect, the first outer tube agitating blade disposed in the middle tube agitating blade is more rigid on the blade tip side than the blade base end side. Provided is a deep mixing treatment apparatus in which a weak portion having low strength is replaceably provided.

  According to this configuration, when a boulder bites between the first outer tube agitating blade and the middle tube agitating blade and receives a large external force, the tip end side of the first outer tube agitating blade having a low rigidity strength is provided. The fragile part provided breaks to buffer the external force and prevent damage to the main body side of the outer tube. Moreover, since the weak part of the 1st outer pipe | wing stirring blade is replaceable, repair is also easy.

  The invention according to claim 14 is the structure according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, or 13, corresponding to the outer peripheral surface of the rod, There is provided a deep layer mixing treatment apparatus provided with a removal brush for removing the mixed soil adhered to the outer peripheral surface of the rod.

  According to this configuration, the in-situ soil attached to the outer peripheral surface of the rod and the injected solidified material can be easily removed by dropping with the removal brush.

  According to a fifteenth aspect of the present invention, in the configuration of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, or fourteenth aspect, the outer periphery of the rod can be rotated. Provided is a deep-mixing processing apparatus provided with a steady-state device that holds the rod to steady-state the rod.

  According to this configuration, the steadying device can perform work in a state in which the deflection of the rod during rotation driving is suppressed, and the workability can be improved.

  According to the present invention, if excessive pressure is generated as excess pressure due to mixing of the excavated in-situ soil and the injected solidified material in the agitation and mixing unit penetrating into the excavation hole, The surplus pressure dissipating means and the like are provided so that the in-situ soil and a part of the injected solidified material are guided upward in the longitudinal direction of the rod (outer tube) to escape and dissipate. Therefore, the excess pressure generated in the stirring and mixing unit is dissipated as the excess pressure, so that the in-situ soil mixed in the stirring and mixing unit and a part of the injected solidified material are forcibly discharged around the excavation hole. Without being mixed, it can be uniformly stirred and mixed. Thereby, the desired cylindrical improvement body can be easily created. Furthermore, since the inner tube agitating blade rotating integrally with the inner tube and the outer tube agitating blade rotating integrally with the outer tube are driven to rotate in directions opposite to each other, the in-situ soil and the injected solidified material are rotated. In-situ soil existing between or around each stirring blade and the injected solidified material are three-dimensionally switched in both the upper, lower, left and right directions, and uniform stirring and mixing are possible.

1 is an overall front view schematically showing a deep mixing treatment apparatus according to an embodiment of the present invention. It is a figure which expands the structure by the side of the rod of a deep mixing processing apparatus same as the above, and draws and shows typically by making each connection fixation part a see-through state. It is a figure which draws and shows the composition of the middle pipe and middle pipe stirring blade in the rod of the deep mixing processing apparatus same as the above in a perspective state, and (a) connects the middle pipe and the middle pipe stirring blade. The figure shown in the state fixed, (b) is a figure explaining the connection fixation of the middle pipe parts which comprise a middle pipe, (c) is the sectional view on the AA line of (b). FIG. 2 is a diagram schematically showing a configuration of an outer tube and an outer tube agitating blade in a rod of the deep mixing treatment apparatus as described above, with a part thereof seen through, and (a) connecting the outer tube and the outer tube agitating blade. The figure shown in the state fixed, (b) is a figure explaining the connection fixation of the outer pipe parts which comprise an outer pipe, (c) is the BB line enlarged view of (b). It is a figure which draws typically and shows the structure of the lower end part of a rod and the stirring mixing part in a deep layer mixing processing apparatus same as the above in the perspective state. It is CC sectional view taken on the line of FIG. FIG. 6 is a partially enlarged view showing the extracted configurations of the middle tube and the middle tube stirring blade shown in FIG. 5. It is the DD sectional view taken on the line of FIG. It is an enlarged view of the guidance | induction part in a deep layer mixing processing apparatus same as the above, (a) is a figure explaining the guidance | induction part used in FIG. 7, (b) is a figure explaining the modification of a guidance | induction part. It is an enlarged view of the outer pipe | wing stirring blade in a deep layer mixing processing apparatus same as the above. It is a figure which shows the principal part structure of an outer pipe | tube stirring blade same as the above, (a) is the EE sectional view taken on the line of FIG. 10, (b) is the FF expanded view of (a). It is a figure explaining the mud dropping apparatus in a deep layer mixing processing apparatus same as the above. It is a vertical schematic diagram explaining operation | movement of a deep layer mixing processing apparatus same as the above. It is a horizontal cutaway schematic diagram explaining operation | movement of a deep layer mixing processing apparatus same as the above. It is a figure explaining the modification of the rod in a deep mixing processing apparatus same as the above. It is a figure explaining the other modification of the rod in a deep layer mixing processing apparatus same as the above, (a) is a side view of a rod, (b) is the GG sectional view taken on the line of (a). It is a figure explaining the further another modified example of the rod in a deep mixing processing apparatus same as the above, (a) is a principal part side view of a rod, (b) is a partial exploded view of a rod, (c) is H of (b) FIG. It is a figure explaining the modification of the stirring mixing part in a deep layer mixing processing apparatus same as the above.

  The present invention provides a deep mixing processing apparatus that can easily create a desired cylindrical improved body while eliminating excessive pressure generated in the stirring and mixing section as excessive pressure and reducing displacement applied to the side. In order to achieve the purpose of the above, in the deep mixing processing apparatus in which the solidified material is injected and stirred into the soft ground to form a cylindrical improvement body, the middle pipe provided with the excavating teeth and the solidified material discharge port at the lowermost end And an outer tube mounted on the outer side of the intermediate tube, the rod being driven to rotate in a direction opposite to each other, the intermediate tube and the outer tube, and a lower end portion of the rod and the intermediate tube A stirring blade that rotates integrally with the tube and a stirring blade that rotates integrally with the outer tube; and a stirring and mixing unit that stirs and mixes the excavated ground and the solidified material, and is rotatable integrally with the outer tube. Provided on the outer periphery of the outer tube and mixed in the stirring and mixing unit Some of the excess pressure generated by the solidified material that is injected in situ soil was achieved with the construction of and a surplus pressure dissipation means such as inducible in the longitudinal direction above the rod.

  Hereinafter, a preferred example of a deep mixing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an overall front view schematically showing a deep mixing apparatus according to an embodiment of the invention. In the figure, a deep mixing processing apparatus 10 includes a ground improvement machine 12 that supports a reader 11. Further, an air compressor 13, an engine generator 14, and a solidifying material supply unit 15 are disposed adjacent to the ground improvement machine 12. The air compressor 13 and the motor generator 14 may be disposed on the ground improvement machine 12 in some cases. On the other hand, the solidifying material supply unit 15 is disposed outside the ground improvement machine 12 and at a position adjacent to the ground improvement machine 12, and includes a cement silo 15a, a batcher plant 15b, a grout pump 15c, and the like. .

  The air compressor 13 generates compressed air used in the ground improvement machine 12, and the generator 14 generates and supplies electric power used in the ground improvement machine 12. In addition, the air compressor 13 may not be equipped.

  The solidifying material supply unit 15 mixes cement as a solidifying material stored in the cement silo 15a into a slurry, and sends the solidifying material (cement slurry) into the tube tube 16 by the cloud pump 15c. The rod 20 is supplied into the middle tube 21 described later via the tube 16. In the middle of the tube 16, a flow meter 17 is provided for measuring the amount of solidified material passing through the tube 16, that is, the amount of solidified material supplied into the middle tube 21.

  The reader 11 is vertically supported by a base machine body 12a of the ground improvement machine 12. The reader 11 is provided with a driving device 18 as a rotational driving means so as to be movable up and down. A rod 20 that is an excavation stirring shaft is connected to the inside of the drive device 18 via a swivel 19 so as to be able to drive forward and reverse. Further, the reader 11 includes a tachometer 51 that measures the number of rotations of the rod 20, a depth meter 52 that measures the excavation length of the rod 20, a steadying device 53 that suppresses the deflection of the rod 20, and the rod 20. A mud dropping device 54 and the like for wiping excavated soil adhering to the outer peripheral surface are attached.

  FIG. 2 is an enlarged view of the configuration of the rod 20 side in the deep mixing treatment apparatus 10, and is a diagram schematically showing each connection fixing portion in a see-through state. As shown in FIG. 2, the rod 20 includes a pipe-shaped intermediate tube (also referred to as a central shaft) 21 and a pipe-shaped outer tube (also referred to as an external shaft) 22. The outer tube 22 is mounted on the outer side of the middle tube 21 so as to be relatively rotatable, and therefore the rod 20 is formed as a double tube structure. Further, the inner tube 21 and the outer tube 22 are connected so as to be driven forward and backward in opposite directions by driving of the driving device 18.

  Further, a digging tooth 23 is attached to the lowermost side surface of the intermediate tube 21 in the rod 20. Further, a solidifying material supply passage 24 through which the solidifying material (cement slurry) sent from the solidifying material supply unit 15 through the tube pipe 16 passes is provided in the intermediate tube 21. Therefore, the lower end of the solidifying material supply passage 24 communicates with the solidifying material discharge port 25 on the lowermost end surface of the middle tube 21. The tip of the tube tube 16 is connected to the uppermost end of the intermediate tube 21 so that the solidified material is sent to the solidified material discharge port 25 through the solidified material supply passage 24. In addition, a bowl-shaped stirring and mixing portion is formed at the lower end portion of the rod 20, which includes an inner tube stirring blade 27 that rotates integrally with the inner tube 21 and an outer tube stirring blade 28 that rotates together with the outer tube 22. A stirring and mixing unit 26 is attached.

  More specifically, FIG. 3 shows the structure of the intermediate tube 21 and the structure of the intermediate tube stirring blade 27 attached to the lowermost end of the intermediate tube 21. As shown in FIG. 3A, the intermediate tube 21 is formed as a single rod-like tube body by connecting and fixing a plurality of intermediate tube portions 21a, 21b, 21b, 21c, and 21d in series. . The solidified material discharge port 25 and the excavating teeth 23 are provided at the lower end of the middle tube portion 21 d disposed at the lowermost end portion of the middle tube 21.

  The remaining intermediate tube portions 21a, 21b, 21b, and 21c except for the intermediate tube portion 21d have different lengths, but one end side (upper end side) of all the tube portions 21a, 21b, 21b, and 21c. ) Is provided with a connecting convex portion 211, and a connecting concave portion 212 is provided on the other end side (lower end side). Each of the intermediate tube portions 21a, 21b, 21b, and 21c is shown in FIG. 3B by arranging two intermediate tube portions, that is, the intermediate tube portion 21b and the intermediate tube portion 21b in a straight line. The connecting convex portion 211 of the intermediate pipe portion 21b (or any of 21a, 21c) to be connected is inserted into the connecting concave portion 212 of the intermediate pipe portion 21b (or any of 21a, 21c) to be connected, The intermediate tube portions 21b and 21b are connected and fixed so as to be integrally rotatable with bolts, nuts, pins and the like, thereby forming the single tubular tube. In the present embodiment, the intermediate tube portion 21a connected and fixed to the swivel 19 and the intermediate tube portion 21c connected and fixed to the intermediate tube stirring blade 27 of the stirring and mixing portion 26 include the intermediate tube portion 21a and the intermediate tube portion. The middle pipe portions 21b and 21b that are shorter than the length of the middle pipe portion 21b are used, but the length of each pipe portion is the depth of excavation at the site, the condition of the original ground, etc. It is changed by.

  Moreover, the said connection convex part 211 is also formed in the one end side (upper end side) of the said middle pipe part 21d. Therefore, when connecting the intermediate tube portion 21d to the intermediate tube portion 21c, the connection convex portion 211 of the intermediate tube portion 21d is inserted into the connection concave portion 212 of the intermediate tube portion 21c and fastened with bolts, nuts, pins, or the like. The intermediate tube portion 21d can be connected and fixed so as to be integrally rotatable with the intermediate tube portion 21c.

  Furthermore, an outer peripheral surface of the intermediate tube portion 21c arranged between the intermediate tube portion 21b and the intermediate tube portion 21d, that is, connected and fixed to the lower end portion of the intermediate tube portion 21 is along the axis of the intermediate tube portion 21c. The middle tube spiral blade 29 is formed integrally.

  FIG. 4 shows the structure of the outer tube 22 and the structure of the outer tube stirring blade 28 attached to the lowermost end of the outer tube 22. As shown in FIG. 4 (a), the outer tube 22 is formed as a single rod-like tube by sequentially connecting and fixing a plurality of outer tube portions 22a, 22a, 22b, 22c, and 22d in series. Yes. And the said outer tube | pipe stirring blade 28 is provided in the lower end of the outer tube | pipe part 22d arrange | positioned at the lowest end part. The inner diameters of these outer tube portions 22a, 22b, 22c, and 22d are such that the intermediate tube portions 21a, 21b, and 21c can rotate within the outer tube portions 22a, 22b, 22c, and 22d, respectively. It is formed larger than the maximum outer diameter of 21b, 21b, 21c.

  The remaining outer tube portions 22a, 22b, and 22c except for the outer tube portion 22d are connected to both ends (upper and lower ends) of all the tube portions 22a, 22b, and 22c, although the lengths are different. A flange portion 221 is provided. Each of these outer tube portions 22a, 22b, and 22c has two outer tube portions, that is, the outer tube portion 22a and the outer tube portion 22a arranged side by side in FIG. By connecting the connecting flange portions 221 of the pipe portion 22a (or any of 22b and 22c) to each other and connecting and fixing the connecting flange portions 221 and 221 with bolts and nuts (not shown), It is formed as a single rod-shaped tube. The number and combination of the outer pipe portions 22a, 22b, 22c, and 22d are changed depending on the depth of excavation at the site and the condition of the ground as in the case of the middle pipe portions 21a, 21b, 21c, and 21d. It is what is done.

  Furthermore, the outer tube portion 22b is wound around the axis of the outer tube portion 22a on the outer surface of the outer tube portion 22a and 22a, which is connected and fixedly arranged between the outer tube portion 22b and the swivel 19. The outer tube spiral wing 30 as the surplus pressure dissipation means is formed integrally with the outer tube portion 22a. In the present embodiment, the outer tube spiral blade 30 is not formed in a continuous state from the lower end to the upper end of the outer tube portion 22 a, and a space 31 is provided between the outer tube spiral blade 30 and the outer tube spiral blade 30. Are formed intermittently along the axial direction (longitudinal direction) of the outer tube portion 22a.

  As described above, the intermediate tube 21 and the outer tube 22 each formed as the rod-shaped tube body are formed as a rod 20 having a double tube structure in which the intermediate tube 21 is rotatably disposed in the outer tube 22. Has been. As shown in FIG. 2, when the intermediate tube 21 is incorporated in the outer tube 22, the intermediate tube connection position 32 (shown also in FIG. 3) between the tube portions of the intermediate tube 21 and the tube of the outer tube 22. The outer pipe connection positions 33 (also shown in FIG. 4) between the parts are set so as to be shifted from each other by a distance S in the longitudinal direction of the pipe material.

  As shown in FIGS. 5, 6, 7, and 8, the middle tube agitating blade 27 of the stirring and mixing unit 26 is disposed around the middle tube 21 and fixed to the lower end side of the middle tube 21. It is attached so that it can rotate integrally. Further, as shown in FIG. 8, a pair of the middle tube agitating blades 27 are provided in a state where they are displaced from each other by 180 degrees. As shown in FIG. 7, each of the middle tube agitating blades 27 has an upper horizontal blade 27a, a lower horizontal blade 27b, and right and left connecting the tip portions of the upper horizontal blade 27a and the lower horizontal blade 27b. A pair of vertical blades 27c and 27c are integrally formed and formed in a substantially rectangular shape in a side view, and the inside of the stirring and mixing unit 26 is shaped like a bowl by rotating the middle tube stirring blade 27. Stirring and mixing proceeds with the stirring and mixing unit in the state. As shown in FIGS. 8 and 9A, the horizontal cross-sectional shape of the vertical wings 27c and 27c is gradually mountain-shaped toward the inner side of the vertical wings 27c and 27c toward the center of rotation in the horizontal cross-sectional view. Each is provided with a mixed soil guiding portion 34 as protruding mixed soil guiding means. Further, the mixed soil guiding portion 34 provided on each of the vertical blades 27c and 27c is changed to a mountain shape, for example, so as to protrude toward the rotation center side as shown in FIG. You may form with the protruding plate provided by protruding to the rotation center side of the rod 20 from the inner surface in the vertical blades 27c and 27c of the tube stirring blade 27 substantially perpendicularly. Further, as shown in FIG. 7, digging teeth 35 projecting downward are provided on the lower surface side of the lower horizontal blade 27b.

  As shown in FIGS. 5, 6, 10, and 11, the outer tube stirring blade 28 of the stirring and mixing unit 26 is fixed to the lower end side of the outer tube 22 so as to be integrally rotatable. The outer tube agitating blade 28 includes a first outer tube agitating blade 28 a that rotates within the middle tube agitating blade 27, and a second outer tube agitating blade 27 that is disposed outside the middle tube agitating blade 27 and above the intermediate tube agitating blade 27. The outer tube agitating blade 28b is provided, and the excavating teeth 36 are provided on the upper surface side and the lower surface side of the second outer tube agitating blade 28b, respectively. Further, as shown in FIGS. 6 and 11, the first outer tube agitating blade 28a has an auxiliary agitating blade 28d formed at the blade tip side with a rigidity strength lower than the rigidity strength on the blade base end portion 28c side. The fragile portion is attached to the blade base end portion 28c in a replaceable manner with bolts and nuts. The auxiliary stirring blade 28d breaks prior to the blade base end portion 28c when an excessive load (external force) is applied to the first outer tube stirring blade 28a side during stirring in the stirring and mixing unit 26, It serves to prevent the base end portion 28c of the first outer tube stirring blade 28a on the side from being broken directly. When the auxiliary stirring blade 28d breaks, only the auxiliary stirring blade 28d needs to be replaced.

  As shown in FIG. 1, the steady rest device 53 has one end fixed to the reader 11 and the other end protruding to the rod 20 side. The rod 20 is supported at the other end protruding to the rod 20 side so that the rod 20 can be rotated and moved up and down, and the rod 20 generated during the operation or the like serves to suppress vibration.

  As shown in FIG. 12, the mud dropping device 54 is attached with one end protruding to the rod 20 side and the other end fixed to the steadying device 53. Further, a mud dropping brush 54 a that is in contact with the outer peripheral surface of the outer tube 22 is attached to one end portion thereof. The mud dropping brush 54 a serves to wipe off the excavated soil adhering to the outer peripheral surface of the outer tube 22. Further, the mud dropping brush 54a is provided in a state of being in constant contact with the outer peripheral surface of the outer tube 22, but may be in contact with the outer peripheral surface of the outer tube 22 only when necessary.

  Next, the construction operation of the deep mixing apparatus according to the present embodiment will be described with reference to FIGS. 1 to 12 and the schematic diagrams shown in FIGS. First, as shown in FIG. 1, the ground improvement machine 12 causes the reader 11 to stand at a predetermined construction position, and the stirring and mixing unit 26 provided at the lower end of the rod 20 is set to the predetermined construction position. Next, the drive device 18 at the upper end of the rod 20 is activated to drive the rod 20 to rotate. In this rotation, the middle tube 21 and the outer tube 22 are rotated in directions opposite to each other, and the rotation speed of either the middle tube 21 or the outer tube 22 (21 or 22) is the other tube (22 or 22). It is driven faster than 21), that is, at a different rotational speed. In this embodiment, the rotation speed of the outer tube 22 is rotated faster than the rotation speed of the middle tube 21.

  Then, as shown in FIG. 13 and FIG. 14, the stirring and mixing unit 26 penetrates the raw ground 100 and the solidified material is discharged from the solidified material discharge port 25 at the lowest end of the middle tube 21. This solidified material is a solidified material that has been sent from the solidified material supply section 15 through the tube pipe 16 from the upper end of the middle tube 21 and has been sent through the solidified material supply passage 24. Further, in this excavation, the excavation is performed temporarily by the excavation teeth 23 and 35 on the tip side, and the excavated original soil and the original soil mixed with the solidified material are vertically rotated by the vertical blade 27c by the middle tube agitating blade 27. And then into the space created inside the vertical wing 27c (hereinafter, this space is referred to as "籠"), and the in-situ soil and solidified material already loosened in the 中 でStir. Further, as the middle tube agitating blade 27 is penetrated into the original ground 100, a vertical hole 101b is excavated in the original ground 100, and at the same time as the excavation formation, the agitated mixing filling the vertical hole 101b. The soil 102 is sequentially created.

  Further, in this excavation, the original ground soil pressure P1 is received from the surroundings during the excavation, but the vertical blade 27c of the middle tube agitating blade 27 rotates, so that the vertical blade 27c cuts the edge between the vertical hole 101b and the original ground 100. An effect is produced, and excavation and stirring mixing of a circular hole in which the boundary 101a between the mixed soil 102 and the original ground 100 is clear is performed.

  Further, the in-situ soil 100 excavated by the excavating teeth 23 and the excavating teeth 35 is not only in the horizontal direction, but also in the horizontal direction due to the agitation and mixing accompanying the reciprocal rotation of the middle tube agitating blade 27 and the outer tube agitating blade 28 in the vertical hole 101b. Rebounded in the vertical direction. Moreover, the intermediate tube 21 and the outer tube 22 rotate in opposite directions, and the rotation speed of one tube (21 or 22) is higher than that of the other tube (22 or 21), that is, the rotation speed is different. Driven. Thereby, the in-situ soil 100 existing between or around each of the stirring blades 27 and 28 is three-dimensionally stirred and mixed in both the upper, lower, left and right directions.

  The in-situ soil 100 generated in the vertical hole 101b is further agitated and mixed with the solidified material discharged from the solidified material discharge port 25 of the middle tube 21 in the agitating and mixing unit 26 and agitated mixed soil. 102. Further, in the stirring and mixing section 26, a mixed soil guiding section 34 is provided on the inner surface side of the vertical blade 27c of the middle tube stirring blade 27 as a mixed soil guiding means that gently protrudes in a mountain shape toward the rotation center side. Therefore, as the mixed soil guiding portion 34 rotates integrally with the vertical blade 27c, the mixed soil guiding portion 34 is agitated as shown by an arrow 56 in FIGS. 6, 8, 13, and 14. The mixed soil 102 is pushed toward the center of the vertical hole 101b. As a result, the mixed soil 102 that has been stirred is gathered in the center direction to become the mixed soil 103 that has been further stirred and fluidized, and the pressure P <b> 2 is concentrated in the central direction of the rod 20.

  At this time, in the agitation / mixing unit 26, the excessive pressure (excess pressure P3) generated by the in-situ soil 100 and the injected solidified material is agitated and mixed with a part of the fluidized mixed soil 103. It is guided upward along the rod 20 (outer tube 22) from inside the portion 26 to escape. Further, when a part of the fluidized mixed soil 103 is moved to the portion of the outer tube spiral blade 30 formed as the surplus pressure dissipation means, a part of the fluidized mixed soil 103 is transferred to the outer tube 22. The outer pipe spiral blade 30 that rotates together with the outer pipe spiral blade 30 is smoothly evacuated upward, that is, to the upper side of the original ground 100, and the excess pressure P3 is dissipated. In the present embodiment, the outer tube spiral blade 30 is intermittently provided along the longitudinal direction on the outer peripheral surface of the outer tube 22, so that the fluidized mixed soil 103 is moved by the excess pressure P3 here. When the outer tube spiral blade 30 is eliminated, the outer tube spiral blade 30 is fed only by the feeding force. Since the outer tube spiral blade 30 is intermittently provided along the longitudinal direction on the outer peripheral surface of the outer tube 22, the outer tube 30 is forcedly dissipated while guiding the excess pressure P3 upward.

  Further, on the lower end side of the rod 20, an intermediate tube rotating blade 29 is provided on the peripheral surface of the intermediate tube portion 21 c in the intermediate tube 21, and the intermediate tube spiral blade 29 rotates in a direction opposite to the outer tube spiral blade 30. Yes. Therefore, when a part of the fluidized mixed soil 103 guided upward by the surplus pressure P3 tries to enter between the intermediate pipe 21 and the outer pipe 22, the intermediate spiral blade 29 rotates downward. And part of the fluidized mixed soil 103 is prevented from entering between the intermediate pipe 21 and the outer pipe 22.

  Thus, when the vertical hole 101b excavated by the excavating teeth 23, the excavating teeth 35, etc. reaches a specified depth, the rod 20 and the agitation / mixing unit 26 are temporarily pulled up to a predetermined height while rotating. Note that the depth meter 52 measures whether or not the stirring and mixing unit 26 has reached a predetermined depth. Further, at the time of this pulling up, the agitated mixed soil 102 deposited on the upper side of the agitating and mixing unit 26 by the excavating teeth 36 of the second outer tube agitating blade 28b is re-stirred and loosened. Thereafter, the rod 20 is lowered together with the stirring and mixing unit 26, and the fluidized mixed soil 103 is again inserted into the original excavation position while stirring and mixing, and the bottom of the improved pile is finished.

  Thereafter, the stirring and mixing unit 26 is pulled out to the surface of the original ground 100 while rotating the rod 20 together with the stirring and mixing unit 26 and stirring and mixing the solidified material, the original soil 100 and the stirred mixed soil 102. Then, an improved body (pile) with a uniform predetermined diameter is created.

  Moreover, in this deep mixing processing apparatus 10, since the brush 54a of the mud removing apparatus 54 is provided in contact with the outer peripheral surface of the outer tube 22, when the rod 20 is pulled out, the outer surface and the outer surface of the outer tube 22 are removed. The mixed residual soil or the like adhering to the tube spiral blade 30 is wiped away by the brush 54a and removed.

  Therefore, according to the deep mixing processing apparatus 10 of the present embodiment, the excavated in-situ soil 100 and the injected solidified material are mixed in the agitation and mixing unit 26 that is inserted into the vertical hole 101b that is an excavation hole. The excessive pressure generated by this is surplus pressure dissipating means provided on the outer peripheral surface of the outer tube 22 as a surplus pressure P3, with a part of the fluidized mixed soil 103 in the stirring and mixing section 26 being provided. It is dissipated by being guided by the outer tube spiral blade 30 upward in the longitudinal direction of the rod 20 to escape. Further, since the vertical blade 27c of the middle tube agitating blade 27 is rotated and excavation is performed while producing an edge cutting effect between the vertical hole 101b and the original ground 100, the boundary 101a between the vertical hole 101b and the original ground 100 is clear. Excavation is done. As a result, the excessive pressure generated by the in-situ soil 100 mixed in the stirring and mixing unit 26 and the injected solidified material is not displaced in the lateral direction of the vertical hole 101b, and has a desired cylindrical shape. Improvements can be created.

  Further, the middle tube agitating blade 27 that rotates integrally with the middle tube 21 and the outer tube agitating blade 28 that rotates integrally with the outer tube 22 are driven to rotate in directions opposite to each other. 102 and the fluidized mixed soil 103 are suppressed, and the mixed soil (102, 103) existing between or around the stirring blades 27, 28 is three-dimensionally switched in both the upper, lower, left and right directions to be uniform. Can be stirred and mixed.

  The middle tube 21 is formed as a single pipe by connecting a plurality of middle tube portions 21a, 21b, 21c, and 21d, and the outer tube 22 is formed of a plurality of outer tube portions 22a, 22b, and 22c. 22d are connected to form a single pipe. Further, the connecting position 32 of each pipe portion 21a, 21b, 21c, 21d in the middle pipe 21 and the connecting position 33 of each pipe portion 22a, 22b, 22c, 22d in the outer pipe 22 are respectively in the longitudinal direction of the pipe material. Is shifted by a distance S. In addition, since the intermediate tube 21 and the outer tube 22 are rotated in directions opposite to each other, for example, the connecting portion (connecting position 32) or / and the outer tube portion (22a) between the intermediate tube portions (21a, 21b, 21c, 21d). 22b, 22c, 22d) even when the connecting portion (connecting position 33) is bent, when the intermediate tube 21 and the outer tube 22 rotate, the intermediate tube 21 and the outer tube 22 are mutually connected. Continue to rotate while correcting the bend in the vertical direction. Thereby, the verticality of the connecting portion (connecting position 32) between the intermediate tube portions (21a, 21b, 21c, 21d) and the connecting portion (connecting position 33) between the outer tube portions (22a, 22b, 22c, 22d) ( (Linearity) can be secured.

  The first outer tube agitating blade 28a disposed in the middle tube agitating blade 27 is a dummy auxiliary formed on the blade tip side with a rigidity strength lower than that on the blade base end portion 28c side. Since the weakened portion as the stirring blade 28d is attached to the blade base end portion 28c in a replaceable manner with bolts and nuts, for example, between the first outer tube stirring blade 28a and the middle tube stirring blade 27, etc. When a boulder bites in and receives a large external force, the auxiliary stirrer blade (fragile portion) 28d having a low rigidity strength breaks to buffer the external force, and the first outer tube agitating on the outer tube 22 side, that is, the main body side. It is possible to prevent the damage to the base end portion 28c of the wing 28a from being directly broken and increasing the damage. In addition, since the auxiliary stirring blade 28d is formed to be exchangeable with respect to the outer tube 22 and the blade base end portion 28c side, repair is easy. If the first outer tube agitating blade 28a is replaceable with the outer tube 22, the first outer tube agitating blade 28a is not provided with the auxiliary agitating blade 28d. It is also possible to give the blade 28a itself the role of an auxiliary stirring blade that buffers external force.

  In the above embodiment, a part of the excessive pressure generated by the in-situ soil mixed in the stirring and mixing unit 26 and the injected solidified material is released upward in the longitudinal direction of the rod 20 (outer tube 22). As a surplus pressure dissipating means for dissipating the surplus pressure P3, a structure in which the outer tube spiral blade 30 is intermittently provided on the outer peripheral surface of the outer tube 22 has been disclosed, but other than this, for example, FIG. 15, FIG. 16, FIG. A structure using the outer tube 22 formed as shown in FIG. In the following description, the same components as those in FIGS. 1 to 14 are denoted by the same reference numerals as those in FIGS.

  In the modification shown in FIG. 15, the winding pitch of the outer tube spiral blade 30 provided on the outer tube 22 of the rod 20 as surplus pressure dissipation means is changed in the middle, and the outer tube spiral blade 30 is changed in the longitudinal direction of the outer tube 22. Are wound continuously. As described above, when the outer tube spiral blade 30 is provided by changing the winding pitch in the middle as the surplus pressure dissipating means, the surplus pressure P3 that is guided by the outer tube spiral blade 30 by the surplus pressure and escapes upward in the vertical direction, That is, a part of the fluidized mixed soil 103 can be changed in discharge speed (withdrawal) according to the winding pitch of the outer tube spiral blade 30.

  In the modification shown in FIG. 16, rod-shaped earth pressure guide vanes 37 formed substantially linearly on the outer peripheral surface of the outer tube 20 are provided along the axis of the outer tube 20. In FIG. 16, (a) shows a side view of the outer tube 20, and (b) shows an EE cross-sectional view in (a). In FIG. 2B, four earth pressure guide blades 37 are provided at substantially equal intervals along the outer periphery of the outer tube 22, but preferably three or more. And in the case where the bar-like earth pressure guide vane 37 is provided in this way to form the surplus pressure dissipation means, the excessive pressure generated by the in-situ soil mixed in the stirring and mixing unit 26 and the solidified material injected, That is, when the surplus pressure P3 is generated, a part of the fluidized mixed soil 103 is guided to a groove formed between the earth pressure guide blades 37 and the soil pressure guide blades 37 and continuously escapes vertically upward. The surplus pressure P3 can be gradually dissipated.

  In the modified example shown in FIG. 17, a plurality of sheets are intermittently provided on the outer peripheral surface of the outer tube 20 in the longitudinal direction of the outer tube 20, each of which is wavy in the vertical direction (longitudinal direction of the outer tube 20) in side view. An earth pressure guide blade 55 is provided. When the earth pressure guide blade 55 exhibiting the undulation rotates together with the outer tube 20, a part of the mixed soil 103 that is fluidized by mixing the in-situ soil and the solidified material by the undulation shape can be sent upward. It is like that. Accordingly, as the surplus pressure dissipation means, a plurality of intermittently with respect to the longitudinal direction of the outer tube 20 are provided on the outer peripheral surface of the outer tube 20, and earth pressure guide vanes 55 each exhibiting undulation in a side view are provided. In this case, when an excessive pressure generated by the in-situ soil mixed in the stirring and mixing unit 26 and the solidified material injected, that is, an excessive pressure P3 is generated, a part of the fluidized mixed soil 103 is subjected to earth pressure. The excess pressure P3 can be gradually dissipated by being guided by the guide vanes 55 to escape (retracted) vertically upward.

  In the above embodiment, the outer tube agitating blade 28 includes the first outer tube agitating blade 28 a disposed in the middle tube agitating blade 27 and the middle tube agitating blade 27 above the middle tube agitating blade 27. The second outer tube agitating blade 28a is disclosed, but the second outer tube agitating blade 27a is disposed outside the middle tube agitating blade 27 and below the middle tube agitating blade 27 as shown in FIG. An outer tube agitating blade 28b may be provided, and a drilling tooth 36 may be provided on the lower surface of the second outer tube agitating blade 28b. In this case, the excavating tooth 23 rotating integrally with the outer pipe 22 excavates the original ground 100 after the excavating tooth 23 rotating integrally with the intermediate pipe 21 excavates the original ground 100, and then the intermediate pipe 21 and Since the excavating teeth 36 provided on the first outer tube stirring blade 28 that rotates integrally excavate the original ground 100, even if the original ground 100 is a relatively hard ground, excavation can be easily performed.

  It should be noted that the present invention can be modified in various ways without departing from the spirit of the present invention other than the structure of the above-described modification, and the present invention naturally extends to the modified structure.

DESCRIPTION OF SYMBOLS 10 Deep layer processing apparatus 11 Leader 12 Ground improvement machine 12a Base machine main body 13 Air compressor 14 Motor generator 15 Solidification material supply part 15a Cement silo 15b Batcher plant 15c Cloud pump 16 Tube pipe 17 Flowmeter 18 Drive apparatus 19 Swivel 20 Rod 21 Middle tube 21a, 21b, 21c, 21d Middle tube portion 211 Connection convex portion 212 Connection recess 22 Outer tube 22a, 22b, 22c, 22d Outer middle tube portion 221 Connection flange 23 Drilling tooth 24 Solidification material supply passage 25 Solidification material Discharge port 26 Stirrer / mixer 27 Middle tube agitating blade 27a Upper horizontal blade 27b Lower horizontal blade 27c Vertical blade 28 Outer tube agitating blade 28a First outer tube agitating blade 28b Second outer tube agitating blade 28c Blade base end 28d Auxiliary stirring blade (fragile part)
29 Middle pipe spiral wing 30 Outer pipe spiral wing (excess pressure dissipation means)
31 Space 32 Middle pipe connection position 33 Outer pipe connection position 34 Mixed soil guiding section (mixed soil guiding means)
35 excavating teeth 36 excavating teeth 37 earth pressure guide vane 51 tachometer 52 depth meter 53 steady rest device 54 mud dropping device 54a brush 55 earth pressure guide vane 56 arrow 100 original ground, original position soil 101a boundary 101b vertical hole (excavation hole )
102 Stirred mixed soil 103 Fluidized mixed soil S Displacement (distance)
P1 Raw soil pressure P2 Pressure P3 Surplus pressure

The present invention has been proposed in order to achieve the above object, a first aspect of the present invention, a Deep Mixing apparatus for forming a cylindrical improved body by injecting stirring the solidifying material in soft ground , Having a middle pipe provided with excavating teeth and a solidified material discharge port at the lowermost end and an outer pipe mounted on the outer side of the middle pipe, the middle pipe and the outer pipe being rotated in directions opposite to each other An excavated ground having a rod that is provided, a middle tube agitating blade that is provided at a lower end of the rod and that rotates integrally with the middle tube, and an outer tube agitating blade that rotates integrally with the outer tube in deep mixing apparatus and a stirring and mixing unit for mixing and stirring the said solidifying material and, provided on the outer circumferential surface of the outer tube and integrally rotatable outer tube, in situ mixed by the stirring and mixing portion Momihogushi by stirring the mixed soil generated by solidified material that is injected with the soil, the mixed Soil provides Deep Mixing apparatus comprising a surplus pressure dissipation means derivable in the longitudinal direction above the rod portion of the excess pressure in accordance with the pressure.

The present invention provides a deep mixing processing apparatus that can easily create a desired cylindrical improved body while eliminating excessive pressure generated in the stirring and mixing section as excessive pressure and reducing displacement applied to the side. in order to achieve the object of, by injecting stirring the solidifying material in soft ground with a deep mixing apparatus for forming a cylindrical improved body, excavating teeth and consolidated material discharge port is provided at the lowermost end portion A rod having an intermediate tube and an outer tube mounted on the outside of the intermediate tube, the intermediate tube and the outer tube being driven to rotate in directions opposite to each other; and provided at a lower end of the rod and a stirring and mixing unit for mixing and stirring and an outer tube stirring blade, a drilled ground and the solidifying material which rotates integrally with the outer tube and Chukan stirring blade which rotates integrally with hollow tube wherein in deep mixing device, integral with the outer tube rotatably outer tube Provided on the peripheral surface, Momihogushi by stirring the mixed soil generated by the injected and solidified material to the original position soil mixed with the stirring and mixing portion, a portion of the excess pressure the mixed soil in response to the pressure This was realized by providing a configuration including surplus pressure dissipating means that can be guided upward in the longitudinal direction of the rod.

The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is a deep mixing processing apparatus for injecting and stirring a solidified material into a soft ground to form a cylindrical improvement body. , Having a middle pipe provided with excavating teeth and a solidified material discharge port at the lowermost end and an outer pipe mounted on the outer side of the middle pipe, the middle pipe and the outer pipe being rotated in directions opposite to each other An excavated ground having a rod that is provided, a middle tube agitating blade that is provided at a lower end of the rod and that rotates integrally with the middle tube, and an outer tube agitating blade that rotates integrally with the outer tube And an agitation / mixing unit for agitating and mixing the solidified material, and an in-situ position provided on the outer peripheral surface of the outer tube so as to rotate integrally with the outer tube and mixed in the agitation / mixing unit The mixed soil generated by the soil and the injected solidified material is stirred and loosened, and the mixed Soil with excess pressure dissipation means derivable in the longitudinal direction above the rod portion of the excess pressure in accordance with the pressure, the excess pressure dissipation means, substantially straight along the axis of the outer tube A deep-mixing processing apparatus comprising rod-shaped wings formed in the above is provided.

According to this configuration, excessive pressure generated by mixing the excavated ground and the solidified material in the agitation and mixing unit that is inserted into the excavation hole together with the rod is in situ in the agitation and mixing unit. A part of the excess pressure generated by the injected solidified material is dissipated by escape by being guided upward in the longitudinal direction of the rod (outer tube) by the surplus pressure dissipating means provided on the outer peripheral surface of the outer tube. The The excess pressure generated by the in-situ soil mixed in the stirring and mixing unit and the injected solidified material is released upward in the longitudinal direction of the rod, so that the pressure in the drilling hole is reduced, and It is possible to reduce the amount of excessive pressure generated by the in-situ soil and the injected solidified material soaked around the excavation hole. This makes it possible to create a desired cylindrical improvement. Furthermore, since the inner tube agitating blade rotating integrally with the inner tube and the outer tube agitating blade rotating integrally with the outer tube are driven to rotate in directions opposite to each other, the circulation of the mixed soil is suppressed during agitation, and the agitating blade The mixed soil existing between or around the three-dimensionally interchanges in both the upper, lower, left and right directions, and uniform stirring and mixing is possible. Further, when excessive pressure is generated in the stirring and mixing section, the rod-like blades provided on the outer peripheral surface of the outer tube along the axial center in a substantially straight line form the in-situ soil in the stirring and mixing section and the solidified material injected. A part of the generated excessive pressure is not forcedly forced upward in the longitudinal direction of the outer tube, but is released by being guided in an auxiliary manner, and the excessive pressure in the stirring and mixing unit is dissipated as the excessive pressure.

According to a second aspect of the present invention, there is provided a deep mixing processing apparatus according to the first aspect , wherein the rotation of the intermediate tube is rotated at a lower speed than the rotation of the outer tube.

According to a third aspect of the present invention, in the configuration according to the first or second aspect , the intermediate tube and the outer tube are connected to each other by connecting a plurality of pipe materials, and the intermediate tubes are connected to each other. Provided is a deep mixing treatment apparatus in which a position and a connection position between the outer pipes are set to be shifted in the longitudinal direction of the pipe material.

According to a fourth aspect of the present invention, in the configuration according to the first, second, or third aspect, the stirring blade is formed in a rectangular shape in the side view and the excavating teeth are provided on the lower surface side. And the outer tube agitating blade is provided so as to be horizontally rotatable within the rotation range of the middle tube agitating blade.

According to a fifth aspect of the present invention, in the configuration of the first, second, third, or fourth aspect, the outer peripheral surface of the outer tube is connected to the outer peripheral surface of the lower end of the intermediate tube connected to the intermediate tube agitating blade. A deep mixing treatment apparatus is provided in which a middle pipe spiral blade is provided to fill the gap.

The invention according to claim 6 is the configuration according to claim 4 or 5 , wherein the outer tube agitating blade includes a first outer tube agitating blade disposed in the middle tube agitating blade, and the middle tube agitating blade. And a second outer tube agitating blade disposed on the outer side of the middle tube agitating blade, and provided with a deep mixing processing device provided with excavating teeth on the upper surface side of the second outer tube agitating blade To do.

The invention according to claim 7 is the configuration according to claim 4 or 5 , wherein the outer tube agitating blade includes a first outer tube agitating blade disposed in the middle tube agitating blade, and the middle tube agitating blade. And a second outer tube agitating blade disposed below the middle tube agitating blade, and provided with a deep mixing treatment apparatus provided with drilling teeth on the lower surface of the second outer tube agitating blade .

According to an eighth aspect of the present invention, in the configuration of the sixth or seventh aspect , the first outer tube agitating blade disposed in the middle tube agitating blade is more rigid on the blade tip side than on the blade base end side. Provided is a deep mixing treatment apparatus in which a weak portion having low strength is replaceably provided.

According to a ninth aspect of the present invention, in the configuration according to the first, second, third, fourth, fifth, sixth, seventh, or eighth aspect, the rod attached to the outer peripheral surface of the rod corresponding to the outer peripheral surface of the rod. Provided is a deep layer mixing treatment apparatus provided with a removal brush for removing mixed soil.

A tenth aspect of the present invention is the configuration according to the first, second, third, fourth, fifth, sixth, seventh, eighth, or ninth aspect , wherein the rod is held steady by rotatably holding the outer periphery of the rod. Provided is a deep-mixing processing apparatus provided with a steady rest.

The present invention provides a deep mixing processing apparatus that can easily create a desired cylindrical improved body while eliminating excessive pressure generated in the stirring and mixing section as excessive pressure and reducing displacement applied to the side. In order to achieve the purpose of doing so, it is a deep mixing processing apparatus that forms a cylindrical improvement body by injecting and stirring a solidified material into soft ground, provided with a drilling tooth and a solidified material discharge port at the lowest end A rod having an intermediate tube and an outer tube mounted on the outside of the intermediate tube, the intermediate tube and the outer tube being driven to rotate in directions opposite to each other; and provided at a lower end of the rod A stirring and mixing unit that has a middle tube stirring blade that rotates integrally with the middle tube and an outer tube stirring blade that rotates integrally with the outer tube, and that stirs and mixes the excavated ground and the solidified material; In the deep mixing treatment apparatus, the outer tube is rotatable in unison with the outer tube. The mixed soil generated by the in-situ soil mixed in the stirring and mixing unit and the injected solidified material is stirred and loosened, and the mixed soil removes a part of the excess pressure according to the pressure. By providing surplus pressure dissipating means that can be guided upward in the longitudinal direction of the rod, the surplus pressure dissipating means is composed of rod-like wings formed substantially linearly along the axis of the outer tube. It was realized.

Claims (15)

In the deep mixing treatment device that forms a cylindrical improvement body by injecting and stirring the solidified material into the soft ground,
It has a middle pipe provided with excavating teeth and a solidified material discharge port at the lowermost end and an outer pipe mounted on the outer side of the middle pipe, and the middle pipe and the outer pipe are driven to rotate in directions opposite to each other. And rod
An intermediate tube agitating blade that is provided at a lower end of the rod and rotates integrally with the intermediate tube; and an outer tube agitating blade that rotates integrally with the outer tube; and the excavated ground and the solidified material; A stirring and mixing unit for stirring and mixing;
A part of the excessive pressure generated by the in-situ soil mixed in the stirring and mixing portion and the injected solidified material is provided on the outer peripheral surface of the outer tube so as to be able to rotate integrally with the outer tube. Surplus pressure dissipating means that can be guided upward;
A deep mixing apparatus characterized by comprising:   2. The deep mixing apparatus according to claim 1, wherein the surplus pressure dissipating means includes a spiral wing wound continuously in the longitudinal direction of the outer tube.   The said excess pressure dissipation means has a helical wing | blade formed in the longitudinal direction of the said outer tube | pipe and changing the winding pitch in the middle. Deep mixing processing equipment.   The surplus pressure dissipating means is characterized by intermittently providing spiral wings wound continuously in the longitudinal direction of the outer tube with respect to the longitudinal direction of the outer tube. The deep mixing apparatus according to claim 1.   2. The surplus pressure dissipating means is formed by a plurality of blades intermittently disposed in the longitudinal direction of the outer tube, each of which is formed of wings that are wavy in a side view. Deep mixing processing equipment.   The deep mixing apparatus according to claim 1, wherein the surplus pressure dissipating means is a rod-shaped wing formed substantially linearly along the axis of the outer tube.   7. The deep mixing apparatus according to claim 1, wherein the middle tube is rotated at a lower speed than the outer tube.   The intermediate tube and the outer tube are each formed by connecting a plurality of tube materials, and the connection positions of the intermediate tubes and the connection positions of the outer tubes are shifted from each other in the longitudinal direction of the tube material. 8. The deep layer processing apparatus according to claim 1, wherein the deep layer processing apparatus is set.   The middle tube agitating blade is formed in a rectangular shape in a side view and has a drilling tooth on the lower surface side, and the outer tube agitating blade is disposed so as to be horizontally rotatable within the rotation range of the middle tube agitating blade. The deep layer processing apparatus according to claim 1, 2, 3, 4, 5, 6, 7 or 8.   The intermediate tube spiral blade is provided on the outer peripheral surface of the lower end of the intermediate tube connected to the intermediate tube agitating blade so as to fill a gap with the inner peripheral surface of the outer tube. 2, 3, 4, 5, 6, 7, 8 or 9.   The outer tube agitating blade includes a first outer tube agitating blade disposed in the middle tube agitating blade, and a second outer tube disposed outside the middle tube agitating blade and above the middle tube agitating blade. 11. The deep mixing apparatus according to claim 9, further comprising a tube stirring blade, wherein a drilling tooth is provided on an upper surface side of the second outer tube stirring blade.   The outer tube stirring blade includes a first outer tube stirring blade disposed in the middle tube stirring blade, and a second outer tube disposed outside the middle tube stirring blade and below the middle tube stirring blade. 11. The deep mixing apparatus according to claim 9, further comprising a tube agitating blade, wherein a drilling tooth is provided on a lower surface of the second outer tube agitating blade.   The first outer tube agitating blade disposed in the middle tube agitating blade is characterized in that a weakened portion having a lower rigidity than the blade base end side is replaceably provided on the blade leading end side. The deep mixing apparatus according to claim 11 or 12.   The removal brush which removes the said mixed soil adhering to the outer peripheral surface of this rod is provided corresponding to the outer peripheral surface of the said rod, The 1, 2, 3, 4, 5, 6 characterized by the above-mentioned. , 7, 8, 9, 10, 11, 12 or 13.   An anti-sway device that holds the outer periphery of the rod in a rotatable manner and prevents the rod from being anti-swayed is provided. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 , 11, 12, 13 or 14.

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