JP6842959B2 - Stirring mixer - Google Patents

Description

The present invention relates to a stirring and mixing device for deep mixing processing in which the soil excavated on the rotating shaft and the stirring blade does not form a mass and adheres in a dumpling shape.

Examples of this type of stirring / mixing device are shown in FIGS. 4 and 5 (see, for example, Patent Document 1).

As shown in FIGS. 4 and 5, the stirring / mixing device 1 is attached to a rotating shaft 2 rotated by a drive mechanism of a soil improvement construction machine (not shown) and a tip 2a of the rotating shaft 2 to excavate the ground 8. A four-stage stirring blade 4A attached to a position away from the tip 2a of the rotating shaft 2 and the drilling head 3 and stirring and mixing the excavated soil and a solidifying material such as cement slurry (not shown) injected into the soil. , 4B, 4C, 4D and two upper and lower stages of rotation prevention as a rotation prevention plate that is rotatably attached to the rotating shaft 2 to prevent the rotation of the excavated soil and the stirring blades 4A to 4D. It has wings 5 and 5.

At a position near the rotation shaft 2 of the rotation prevention blade 5, a pair of protrusion members 6 and 6 for dropping a mass of soil made of excavated soil that adheres to the rotation shaft 2 and the stirring blades 4A to 4D and rotates are bolted. It is detachably fixed by 7. Each protruding member 6 is formed in a substantially rectangular plate shape in which both upper and lower tip portions 6a and 6b are formed at obtuse angles (about 120 to 150 °). The lowermost stirring blade 4A also has the function of an excavation blade. Further, the lowermost stirring blade 4A and the upper stirring blade 4B are attached to the rotating shaft 2 with the lower rotation prevention blade 5 sandwiched therein. Further, the uppermost stirring blade 4D and the lower stirring blade 4C are attached to the rotating shaft 2 with the upper rotation prevention blade 5 interposed therebetween.

Japanese Unexamined Patent Publication No. 2004-169374

In the conventional stirring / mixing device 1, the protrusion member 6 extends in the vertical direction, and both tip portions 6a, 6b thereof are close to the stirring blades 4A, 4B, 4C, 4D, but separated from the rotating shaft 2. Therefore, it was possible to peel off the soil mass that adheres to each of the stirring blades 4A, 4B, 4C, and 4D, but it was not possible to sufficiently peel off the soil mass that adheres to the rotating shaft 2 and rotates around. ..

Further, even if one of the two tip portions 6a and 6b of the protrusion member 6 is damaged, the entire protrusion member 6 must be replaced, which is costly.

Therefore, the present invention has been made to solve the above-mentioned problems, and provides a stirring / mixing device capable of easily and surely removing a mass of soil adhering to a rotating shaft and a stirring blade and rotating around at low cost. The purpose is.

The invention of claim 1 is a rotating shaft rotated by a drive device, an excavation head attached to the tip of the rotating shaft to excavate the ground, and an excavation head attached to a position away from the tip of the rotating shaft. A stirring blade that stirs and mixes the soil and the solidifying material injected into the soil, and a rotating blade that is rotatably attached to the rotating shaft to prevent the excavated soil and the stirring blade from rotating. In a stirring / mixing device for deep mixing processing provided with a prevention plate, the rotating shaft and the excavated soil adhering to the stirring blade are formed on the upper side and the lower side of the rotation prevention plate. A soil mass shaving plate for shaving the soil mass is detachably attached to each of the soil mass shaving plates, and the soil mass shaving plate is extended so that one corner located inside the rotation axis extends to the side where the rotation axis and the stirring blade intersect. It is formed in a trapezoidal shape having an inclined leg portion and a horizontal leg portion in which one corner portion located outside the rotation axis is separated from the stirring blade and reaches near the rotation prevention plate. It is characterized by.

The invention of claim 2 is the stirring / mixing device according to claim 1, wherein a pair of mounting plates are attached to the rotation preventing plate, and the groove portion formed by the rotation preventing plate and the pair of mounting plates is described. It is characterized in that the horizontal legs of the earthen block shaving plate are sandwiched and detachably fixed via a fastening member.

The invention of claim 3 is the stirring / mixing device according to claim 1 or 2, wherein the rotation of the rotation prevention plate is formed at the other corner portion of the soil shaving plate located inside the rotation axis. It is characterized by forming a notch for approaching a rotary support that rotatably supports the shaft.

The invention of claim 4 is the stirring / mixing device according to any one of claims 1 to 3, wherein the stirring blade is attached in a plurality of stages with the rotation prevention plate sandwiched between the rotating shafts, and the rotation is provided. The earth block shaving plate is detachably fixed to the upper surface side and the lower surface side of the prevention plate, respectively.

As described above, according to the invention of claim 1, it is composed of excavated soil that is detachably attached to the upper side and the lower side of the rotation prevention plate, respectively , and adheres to the rotating shaft and the stirring blade to rotate. Shaving the earth mass The earth mass shaving plate has one corner located inside the rotation axis extending to the side where the rotation axis and the stirring blade intersect, and one corner located outside the rotation axis. By forming a trapezoidal plate with an inclined leg and a horizontal leg that reach close to the rotation prevention plate away from the stirring blade, the soil mass adhering to the rotating shaft and the stirring blade can be easily and surely scraped off. be able to. At this time, a part of the scraped soil mass is sent to the outside through the inclined legs of the soil mass scraping plate and mixed with the solidifying material by stirring, so that the accuracy of the mixing ratio of the soil and the solidifying material can be improved. , Unconsolidated soil mass that is not mixed with the solidifying material can be reduced as much as possible.

According to the invention of claim 2, a pair of mounting plates are attached to the rotation prevention plate, and the horizontal legs of the earthen mass shaving plate are sandwiched and fastened in the groove formed by these rotation prevention plates and the pair of mounting plates. By detachably fixing the soil mass shaving plate via the member, when the soil mass shaving plate is broken, the broken soil mass shaving plate can be easily and quickly replaced.

According to the third aspect of the present invention, there is a notch in the other corner located inside the rotation axis of the earth mass shaving plate to bring the rotation axis of the rotation prevention plate closer to the rotation support that rotatably supports the rotation axis. By forming the above, the lower bottom of the shaving plate can be brought as close as possible to the rotating shaft, and the lumps adhering to the rotating shaft can be more reliably and efficiently scraped off by the lower bottom of the shaving plate. That is, since the adhesion of the soil mass spreads from around the rotation axis to the outside, the adhesion of the soil mass around the rotation axis is surely prevented by shaving by the lower bottom of the soil mass shaving plate, so that the occurrence of the rotation occurs over time. It can be prevented efficiently.

According to the invention of claim 4, the stirring blades are attached in a plurality of stages with the rotation prevention plate sandwiched between the rotation shafts, and the earth mass shaving plates are detachably fixed to the upper surface side and the lower surface side of the rotation prevention plate, respectively. When any one of a plurality of lump shaving plates is broken, only the broken lump shaving plate can be replaced easily and in a short time, and the cost can be reduced accordingly.

It is a side view which shows the 2 shaft type stirring mixing apparatus of 1st Embodiment of this invention. It is an exploded perspective view of the rotation prevention plate and the earth mass shaving plate used in the above-mentioned stirring and mixing apparatus. It is a side view which shows the uniaxial type stirring mixing apparatus of the 2nd Embodiment of this invention. It is a side view which shows the conventional stirring mixing apparatus. It is an enlarged side view which shows the main part of the said conventional stirring and mixing apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing a two-shaft type stirring / mixing device according to the first embodiment of the present invention, and FIG. 2 is an exploded perspective view of a rotation prevention plate and a soil mass shaving plate used in the device.

As shown in FIG. 1, the stirring / mixing device 10 for deep mixing processing is a two-axis type that is detachably attached to a soil improvement construction machine (not shown), and is rotated by a drive motor (drive device) 11 of the ground improvement construction machine. A pair of rotating shafts 12 and 12 and an excavation head 13 attached to the tip 12a of each rotating shaft 12 to excavate the ground 8 and an excavation head 13 attached to a position away from the tip of each rotating shaft 12 at a predetermined distance for excavation. Three-stage stirring blades 14, 15 and 16 for stirring and mixing the soil 9 and the solidifying material S such as cement slurry injected into the soil 9 and a rotating support 18 for each rotating shaft 12 It is rotatably attached and includes a pair of rotation prevention plates 17 and 17 that prevent the excavated soil 9 and the stirring blades 14 to 16 from rotating.

The excavation head 13 includes a plurality of excavation bits 13a. The lowermost stirring blade 14 is fixed to the rotating shaft 12 at intervals of 90 °. Further, a plurality of excavation bits 14a are attached to the lowermost stirring blade 14, which has both an excavation function (excavation blade) and a stirring function. Further, the lowermost stirring blade 14 is provided with a discharge port 14b for discharging cement slurry S, air, and the like.

Further, the stirring blades 15 in the middle stage are fixed to the rotating shaft 12 at intervals of 90 °. Further, the uppermost stirring blade 16 is fixed to the rotating shaft 12 at intervals of 90 °. Further, drawing bits 16a are attached to both sides of the uppermost stirring blade 16.

An annular rotation support 18 on which each rotation shaft 12 is rotatably supported is attached to both sides of each rotation prevention plate 17. Stirring blades 14 to 16 are fixed to each rotation shaft 12 in three stages so as to sandwich each rotation prevention plate 17, and rotation is performed on the upper surface 17a side and the lower surface 17b side of each rotation prevention plate 17. A pair of left, right, top, and bottom shaving plates 20 for shaving a lump of soil made of excavated soil 9 that adheres to the shaft 12 and the stirring blades 14 to 16 are detachably attached.

As shown in FIGS. 1 and 2, in each soil mass shaving plate 20, one corner portion 21 located inside the rotating shaft 12 extends to the intersecting side of the rotating shaft 12 and the stirring blades 14 to 16. , A trapezoidal shape having an inclined leg portion 23 and a horizontal leg portion 24 in which one corner portion 22 located on the outer side of the rotating shaft 12 is separated from the stirring blades 14 to 16 and reaches near the rotation prevention plate 17. It is formed in a plate shape. Due to the inclined leg portion 23, the upper bottom portion 25 parallel to each other of the trapezoidal plate-shaped earth mass shaving plate 20 is shorter than the lower bottom portion 26.

Further, the other corner portion 27 located inside the rotation shaft 12 of the earth mass shaving plate 20 has a rectangular shape for approaching the rotation support 18 that rotatably supports the rotation shaft 12 of the rotation prevention plate 17. A notch 28 is formed. The notch 28 is set so that the lower bottom portion 26 of the earth mass shaving plate 20 is brought as close as possible to the rotating shaft 12 so that the gap between the lower bottom portion 26 of the earthen mass shaving plate 20 and the rotating shaft 12 becomes smaller. The soil mass shaving plate 20 is formed by cutting an inexpensive iron plate having a thickness of 6 to 12 mm with gas or the like, and has a fragile structure that bends when a stone contained in the excavated soil 9 hits it. At this time, the rotation prevention plate 17 has a rigidity that does not deform.

Further, two sets of a pair of mounting plates 30 and 30 are fixed to both side surfaces 17c and 17c of each rotation prevention plate 17 by welding or the like at a predetermined distance. The horizontal leg portion 24 of the earth mass shaving plate 20 is sandwiched between the upper and lower groove portions 32 formed by the upper surface 17a and the lower surface 17b of the rotation prevention plate 17 and the pair of mounting plates 30 and 30, and the bolt (fastening member) 35 is inserted. It is detachably fixed via a nut (fastening member) 36 and a nut (fastening member) 36. A plurality of circular holes 29 and 31 through which the shank portion 35b of the bolt 35 is inserted are formed in the soil mass shaving plate 20 and the mounting plate 30, respectively.

According to the stirring / mixing device 10 of the first embodiment, as shown in FIG. 1, the soil 9 excavated by the plurality of excavation bits 13a of the excavation head 13 and the plurality of excavation bits 14a of the lowermost stirring blade 14. When the cement slurry S discharged from the discharge port 14b of the lowermost stirring blade 14 and injected into the soil 9 is stirred and mixed by the stirring blades 14 to 16, the highly viscous ground 8 and the concentrated slurry are mixed. When a material is used, a rotating phenomenon occurs, and the soil 9 easily adheres to the rotating rotating shaft 12 and each stirring blade 14 to 16 in a dump shape to form a mass, but adheres to the rotating shaft 12. The soil mass to be rotated can be easily and surely scraped off by the lower bottom 26 of each soil mass shaving plate 20 detachably attached to the upper surface 17a side and the lower surface 17b side of the rotation prevention plate 17, and the stirring blade 14 The soil mass 9 that adheres to and accompanies to 16 can be easily and surely scraped off by the inclined leg portion 23 of each soil mass scraping plate 20.

At this time, the soil mass scraped by each soil mass shaving plate 20 is sent to the outside via the inclined leg portion 23 of each soil mass shaving plate 20 and mixed with the cement slurry S by stirring, so that the excavated soil 9 and cement The accuracy of the mixing ratio of the slurry S can be improved, and the unconsolidated soil mass that is not mixed with the cement slurry S can be reduced as much as possible.

Further, a rectangular shape for bringing the rotation shaft 12 of the rotation prevention plate 17 closer to the rotation support 18 that rotatably supports the rotation shaft 12 of the rotation prevention plate 17 to the other corner portion 27 located inside the rotation shaft 12 of each earth mass shaving plate 20. A notch 28 is formed, and the lower bottom portion 26 of each earth mass shaving plate 20 can be brought as close as possible to the rotating shaft 12 by the notch 28. The lower bottom portion 26 of the shaving plate 20 can shave more reliably and efficiently. That is, since the adhesion of the soil mass spreads from around the rotating shaft 12 to the outside, the adhesion of the soil mass around the rotating shaft 12 is surely prevented by shaving by the lower bottom portion 26 of each soil mass shaving plate 20. It is possible to efficiently prevent the occurrence of rotation over time.

Further, as shown in FIGS. 1 and 2, three stages of stirring blades 14 to 16 are fixed to the rotating shaft 12 with the rotation prevention plates 17 sandwiched therein, and are attached to both side surfaces 17c and 17c of the rotation prevention plates 17. , Two sets of a pair of mounting plates 30 and 30 are fixed at a predetermined distance, and a mass of soil is formed in each of the upper and lower groove portions 32 formed by the upper surface 17a and the lower surface 17b of the rotation prevention plate 17 and the pair of mounting plates 30 and 30. By sandwiching the horizontal leg 24 of the shaving plate 20 and fixing it detachably via bolts 35 and nuts 36, if any of the eight shaving plates 20 is broken, the broken soil lump Only the shaving plate 20 can be replaced easily and in a short time, and the cost can be reduced accordingly.

FIG. 3 is a side view showing a uniaxial stirring / mixing device according to a second embodiment of the present invention.

As shown in FIG. 3, the stirring / mixing device 10'for deep mixing processing is a single-screw type that is detachably attached to a ground improvement construction machine (not shown), and is driven by a drive motor (drive device) 11 of the ground improvement construction machine. A rotating rotating shaft 12, an excavation head 13 attached to the tip 12a of the rotating shaft 12 to excavate the ground 8, and a soil 9 attached to a position away from the tip of the rotating shaft 12 at a predetermined distance and excavated. The three-stage stirring blades 14, 15 and 16 for stirring and mixing the solidifying material S such as cement slurry injected into the soil 9 and the rotating shaft 12 are rotatably attached via the rotating support 18. It is provided with a rotation prevention blade (rotation prevention plate) 17'that prevents rotation between the excavated soil 9 and each of the stirring blades 14 to 16.

The rotation prevention plate blade 17'is formed in the shape of a square frame plate, and the stirring blade 15 in the middle stage is rotatably provided inside the square frame plate. Since the configurations of the other rotary shaft 12, the excavation head 13, the stirring blades 14 to 16, the earth mass shaving plate 20, and the mounting plate 30 are the same as those in the first embodiment, the same reference numerals are given to the same components. A detailed description will be omitted.

According to the stirring / mixing device 10'of the second embodiment, the soil mass having the same action and effect as that of the first embodiment, and adhering to the uniaxial rotating shaft 12 and the stirring blades 14 to 16 and rotating around. Can be easily and reliably removed at low cost.

According to each of the above-described embodiments, a single-axis or two-axis rotation axis is used, but a rotation axis of three or more axes may be used.

8 Ground 9 Excavated soil 10,10'Agitating and mixing device for deep mixing process 11 Drive motor (drive device)
12 Rotating shaft 12a Tip 13 Excavation head 14, 15, 16 Stirring blade 17 Rotation prevention plate 17 ′ Rotation prevention blade (rotation prevention plate)
17a Upper surface 17b Lower surface 18 Rotating support 20 Shaving plate 21 One corner located inside 22 One corner located outside 23 Inclined leg 24 Horizontal leg 27 The other corner located inside 28 Notch 30, 30 Pair of mounting plates 32 Grooves 35 Bolts (fastening members)
36 nut (fastening member)
S Cement slurry (solidifying material)

Claims (4)

A rotating shaft rotated by a drive device, an excavation head attached to the tip of the rotating shaft to excavate the ground, and an excavated soil attached to a position away from the tip of the rotating shaft and injected into the excavated soil and the soil. It is provided with a stirring blade that stirs and mixes the solidified material, and a rotation prevention plate that is rotatably attached to the rotating shaft to prevent the excavated soil and the stirring blade from rotating. In the stirring and mixing device for deep mixing processing
Wherein the upper and lower rotating together preventing plate, mounting the rotary shaft and the clod scraping plate attached to cutting the clod comprising the excavated soil is rotating together with the stirring blade removably respectively,
One corner of the earth mass shaving plate located inside the rotating shaft extends to the side where the rotating shaft and the stirring blade intersect, and one corner located outside the rotating shaft. A stirring and mixing device characterized in that the portion is formed in a trapezoidal plate shape having an inclined leg portion and a horizontal leg portion formed by a portion separated from the stirring blade and reaching close to the rotation prevention plate. The stirring / mixing device according to claim 1.
A pair of mounting plates are attached to the rotating prevention plate, and the horizontal legs of the earthen mass shaving plate are sandwiched in a groove formed by the rotating prevention plate and the pair of mounting plates, and the soil block shaving plate is detachably attached via a fastening member. A stirring and mixing device characterized by being fixed. The stirring / mixing device according to claim 1 or 2.
A notch is formed at the other corner of the earth mass shaving plate, which is located inside the rotation axis, so as to approach the rotation support that rotatably supports the rotation axis of the rotation prevention plate. A stirring and mixing device characterized by. The stirring / mixing device according to any one of claims 1 to 3.
The stirring blades are attached in a plurality of stages with the rotation prevention plate sandwiched between the rotating shafts, and the soil mass shaving plates are detachably fixed to the upper surface side and the lower surface side of the rotation prevention plate, respectively. apparatus.

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