JP2009150101A - Corotation preventing blade of excavating and agitating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a corotation preventing blade by which much resistance is not given to the whole blade body and corotation caused by the friction between the blade and an excavation shaft is prevented upon insertion and extraction. <P>SOLUTION: An excavating and agitating device 1 comprises the excavation shaft 2 provided with a discharging port 23 arranged near the lower end to discharge a solidifier slurry, an excavation blade 3 rotating with the excavation shaft 2, an agitating blade 4 fitted to an upper part of the excavation blade 3 and rotating with the excavation shaft 2, and the corotation preventing blade 5 arranged between the agitation blade 4 and the excavation blade 3 and rotatably fitted to the excavation shaft 2. The corotation preventing blade 5 comprises an annular body 51 rotatably fitted to the excavation shaft 2, and a blade body 50 fitted to the annular body 51 to be parallel to the axial direction of the excavation shaft 2. Inclined parts 54u, 54d, 54s are formed on an outer peripheral part of the blade body 50 in a manner of being rotatable in the direction opposite to the rotation of the agitating blade 4 by coming into contact with the ground upon excavation or extraction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to the structure of a co-rotation preventing wing of an excavating and stirring apparatus used for ground improvement, and more particularly to the structure of a co-rotation preventing wing that hardly causes co-rotation due to friction with a drilling shaft.

  In general, when ground improvement is performed before construction of a building, an excavation stirring device that excavates the ground in a vertical direction is used. This excavator stirrer is used with the upper end supported by an improved machine body such as a crawler type three-point support machine, a rough terrain type support machine or a simple three-point support machine. The excavator blade is attached, and a co-rotation preventing vane and a stirring vane are attached above the excavator blade. And when using such an excavation stirring apparatus, as shown in FIG. 6, excavation and stirring work are performed in the following processes.

  That is, when excavating the ground, the excavation blade 3 is set so that the central axis of the excavation blade 3 is aligned with the surface of the ground, and the excavation axis 2 is adjusted to be perpendicular to the ground (FIG. 6). (A)). Then, after the adjustment is completed, excavation is performed while rotating the excavation shaft 2 in the forward direction, and at this time, the solidified material slurry having a predetermined flow rate is discharged from the tip to perform excavation and stirring (FIG. 6B). ). Then, when the excavation blade 3 reaches a predetermined depth (FIG. 6C), the excavation and discharge of the solidified slurry are stopped, and this time, the excavation shaft 2 is rotated in the opposite direction while stirring at a predetermined speed. Then, drawing and stirring are performed (FIG. 6 (d)). Then, this time, the excavation shaft 2 is rotated in the forward direction and stirred in the excavation direction at a predetermined speed (FIG. 6C). After reaching the predetermined depth again, the excavation shaft 2 is reversed again. It is pulled out at a predetermined speed while rotating in the direction (FIG. 6 (e)).

  By the way, the co-rotation prevention blade used in such excavation and agitation equipment is to prevent a clot from being included in the excavated cylindrical hole (column). This is the one that forcibly chops the soil.

  Moreover, regarding such a co-rotation preventing wing, proposals have been made in many patent documents in recent years (Patent Document 1, Patent Document 2, etc.).

  Among these, the following Patent Document 1 discloses a structure that does not co-rotate due to friction with a drilling shaft or the like as a co-rotation preventing blade. More specifically, the anti-rotation wing of the co-rotation prevention wing that has the tip portion bite into the ground by making it larger than the outer diameter of the ground cut by the excavation wing, thereby preventing it from co-rotating due to friction with the excavation shaft. A structure is disclosed.

Also, the following Patent Document 2 discloses a structure that does not co-rotate due to friction with the excavating shaft, etc., as a related to the co-rotation preventing wing. Specifically, the entire wing body is propeller-shaped. A co-rotation preventing blade that is rotated in the direction opposite to that of the excavating blade by being tilted to the right is disclosed.
JP-A-2005-105736 JP 07-138935 A

  However, the following problems have been pointed out in such conventional anti-corotation blades.

  That is, as shown in the above-mentioned Patent Document 1, in the case where the outer end is slightly bited into the ground, a large resistance is applied to the co-rotation preventing wing depending on the amount of ground biting into the outer peripheral portion, and excavation is performed at the time of insertion or extraction A large resistance is generated between the shaft and the anti-rotation blade. And this resistance may transmit a force in the rotational direction to the co-rotation preventing wing, thereby causing co-rotation.

  Moreover, when using the anti-rotation wing attached to the whole as shown in Patent Document 2, depending on the inclination angle, the resistance to the ground becomes extremely high. Similarly, during excavation and extraction A heavy load is applied. Furthermore, since a large load is applied to the entire wing body during insertion or withdrawal, there is a possibility that deformation or damage at the base portion may occur. Furthermore, when manufacturing the inclined joint rotation prevention blade as shown in Patent Document 2, it must be welded and attached in a state where the inclination angle is set, which causes a problem that it takes much time.

  Therefore, the present invention has been made paying attention to the above-mentioned problems, and does not apply a large resistance to the entire wing body at the time of insertion or extraction, and it is difficult to rotate together due to the resistance generated between the excavation shaft. An object of the present invention is to provide an anti-corotation blade.

  That is, in order to solve the above problems, the present invention provides a drilling shaft provided with a discharge port for discharging the solidified material slurry in the vicinity of the lower end, a drilling blade attached near the lower end of the drilling shaft and rotating together with the drilling shaft, A stirring blade that is attached above the excavating blade and rotates with the excavating shaft, and a co-rotation preventing blade that is provided between the stirring blade and the excavating blade and is rotatably attached to the excavating shaft. In the excavation agitation apparatus, an annular body that is rotatably attached to the excavation shaft and a wing body that is attached to the annular body so as to be parallel to the axial direction of the excavation shaft are provided. And an inclined portion that freely rotates in the direction opposite to that of the agitating blade by contacting the ground during excavation or extraction.

  In this way, by making the co-rotation prevention wing in a flat shape along the axial direction (perpendicular to the ground), the resistance applied during excavation and extraction can be reduced, and by contact with the ground Even when pressure is applied in the vertical direction, since the co-rotation preventing wing is attached in the vertical direction along the pressure, it is possible to prevent a problem that the wing body is detached from the root portion. Furthermore, since it is the structure which only provided the inclination part in the outer peripheral part of the plane attached to the perpendicular | vertical form, manufacture becomes easy and it can rotate a co-rotation prevention wing | blade in a reverse direction with simple structure. It becomes like this.

  Moreover, in such an invention, the inclined part is formed by scraping the upper side or the lower side of the planar wing body provided vertically.

  In this way, the inclined portion can be formed simply by cutting the outer peripheral portion of the wing body having a certain thickness, and the inclined portion can be easily formed. In addition, it is possible to easily provide such an inclined portion for the co-rotation preventing wing currently on the market.

  Furthermore, the inclined portion is formed by cutting the outermost peripheral portion of a planar wing body provided vertically.

  If it does in this way, while being able to reduce the ground and contact resistance in the part projected outside the excavation blade, it can be rotated in the direction opposite to the corotation by the contact.

  In addition, such an inclined portion is fixedly attached to a flat wing body provided vertically.

  If it does in this way, an inclined part can be attached afterwards also to the co-rotation prevention wing currently distribute | circulating to the market. In addition, when the inclined portion is detachably attached, the inclined portion worn by use can be replaced with a new inclined portion, and further, the inclined portion is made of a member having a different hardness. Can also be given.

  According to the co-rotation preventing wing of the present invention, an annular body that is rotatably attached to the excavation shaft and a wing body that is attached to the annular body so as to be parallel to the axial direction of the excavation shaft are provided. Since the outer periphery of the blade body is provided with an inclined portion that freely rotates in the opposite direction to the stirring blade by contacting the ground during excavation or extraction, the resistance applied during excavation or extraction is reduced. Can be reduced. In addition, even when pressure is applied in the vertical direction due to contact with the ground, the wing body is detached from the root part because the co-rotation prevention wing is attached in the vertical direction along the pressure. Can be prevented. Furthermore, since the configuration is such that the inclined portion is only provided on the outer peripheral portion of the plane, the manufacture becomes easy, and the co-rotation preventing blade can be rotated in the reverse direction with a simple configuration.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an overall configuration of an excavating and stirring apparatus 1 according to an embodiment of the present invention, and FIG. 2 shows an enlarged view of the vicinity of the lower end portion thereof.

  This excavating and agitating device 1 is used by being attached to an improved machine body such as a crawler type three-point support machine, a rough terrain type support machine, a simple three-point support machine, and the like. Excavation shaft 2 having a hollow portion for discharging, excavation blade 3 attached to the lower end side of the excavation shaft 2 and excavating the ground, and attached to the upper portion of the excavation blade 3 and rotated together with the excavation shaft 2 It is configured to include two stirring blades 4 and a co-rotation prevention blade 5 that is mounted between the excavation blade 3 and the stirring blade 4 and is freely rotatable with respect to the excavation shaft 2.

  Among these, the excavation shaft 2 provided with this hollow portion can be set to a certain length by connecting a plurality of hollow rods 21 having a hollow inside, and is a length necessary for ground improvement. Set to Then, the upper end side of the connected excavation shaft 2 is connected to the rotation drive mechanism of the improved machine body so that it can rotate clockwise with respect to the traveling direction during excavation, and the solidification sent from the plant. The material slurry is injected from the vicinity of the upper end portion, and the solidified material slurry can be discharged from the discharge port 23 on the lower end side.

  On the other hand, the excavation wing 3 is constituted by a plurality of wing bodies 31 to excavate the ground, and is configured by attaching a comb-shaped excavation blade 32 obliquely to the lower side of the wing bodies 31. The excavation blade 32 excavates the ground so that the earth and sand can be discharged upward.

  Further, the stirring blade 4 provided above the excavating blade 3 is constituted by a rectangular plate-shaped blade body 41 having substantially the same radius as the diameter of the excavating blade 3, and the two blade bodies 41 are excavated. It is provided so as to be symmetrical with respect to the axis 2. The wing body 41 is attached so as to incline the plate-like body as a whole, and is attached in such a direction that the earth and sand in the excavation hole is discharged upward during excavation. Then, the earth and sand are spouted upward by two pairs of upper and lower stirring blades 4, and the ground earth and sand and the solidified material slurry can be stirred by the inclined blade body 41. The stirring blade 4 is attached in a fixed state with respect to the excavation shaft 2, but as this fixed state, it may be attached to the excavation shaft 2 via a cylindrical member, or a clutch or the like may be attached. It may be possible to fix it via the cable.

  And in the excavation stirring apparatus 1 comprised in this way, in this Embodiment, as shown in FIGS. 2-4, the co-rotation prevention wing | blade 5 which shaved the outer peripheral part is provided.

  The co-rotation preventing wing 5 is configured by attaching two or four wing bodies 50 to an annular body 51 attached to the digging shaft 2, and is in a state of being freely rotatable with respect to the digging shaft 2. It is attached with.

  The annular body 51 is configured in a cylindrical shape that encloses the excavation shaft 2, and is rotatably attached in a state in which the vertical movement is restricted by the ring portion 22 of the excavation shaft 2. The annular body 51 is provided so as to reduce friction by providing a packing 52 between the upper and lower ring portions 22. The packing 52 is made of a C-shaped synthetic resin or the like, and prevents large friction between the annular body 51 and the ring portion 22 during excavation or extraction.

  A flat plate-like wing body 50 is attached to the outer peripheral portion of the annular body 51 along the vertical direction (that is, the axial direction of the excavation shaft 2). The wing body 50 is a rectangular flat plate body having a constant thickness, and is fixed to the outer peripheral surface of the annular body 51 by welding or fastening with a bolt via a base or the like. In addition, in FIG. 2, the state which attached the wing | blade body 50 by welding is shown.

  The blade body 50 is provided so as to be slightly longer in the radial direction than the excavating blade 3 and the stirring blade 4, and the upper side 53u and the lower side 53d, and the outermost side on the ground. Inclined portions 54u, 54d, and 54s for contacting and rotating in the direction opposite to the excavation blade 3 are provided.

  The inclined portions 54u, 54d, and 54s are provided by scraping the flat plate-like wing body 50. When the inclined portions 54u, 54d, and 54s are provided, the lower surface 53d has the surface on the side shown in FIG. 2 as the first surface 50a and the opposite surface as the second surface 50b. In the case of (refer to FIG. 3), the lower side 53d side of the first surface 50a is used as a flange 531d, and an inclined surface 55 is formed below the second surface 50b to provide a lower inclined portion 54d. I am doing so. Further, regarding the upper inclined portion 54u provided on the upper side portion 53u side, the inclined surface 55 is formed on the upper side portion 53u side of the first surface 50a, and the upper side portion 53u of the second surface 50b is used as the flange portion 531u. An inclined portion 54u is formed. Further, as shown in FIG. 4, the outer inclined portion 54s provided on the outermost side is a linear flange portion 531s extending from the lowermost outermost portion of the first surface 50a to the uppermost outermost portion of the second surface 50b. The outer inclined portion 54s is provided by providing inclined surfaces 55 on both sides thereof.

  The inclined portions 54u, 54d, and 54s are formed using a grinder or the like in the state of a flat plate in the manufacturing process. Alternatively, when the thickness is relatively high or the hardness is relatively high, an inclined body having the same inclined surface 55 is welded to the upper side 53u, the lower side 53d, and the outermost side of the flat plate by welding. Thus, the inclined portions 54u, 54d, and 54s are integrally provided. At this time, the inclined portions 54u, 54d, and 54s may be provided over the entire outer periphery of the wing body 50, or may be provided only in a part of each side. Further, all of the lower inclined portion 54d, the upper inclined portion 54u, and the outer inclined portion 54s may be provided in the wing body 50, or the lower inclined portion 54d, the upper inclined portion 54u, and the outer inclined portion may be provided. Only one or only two of the portions 54s may be provided.

  Next, the case where ground improvement is performed using the excavation and stirring device 1 configured as described above will be described.

  First, when performing ground improvement, the central axis of the excavation blade 3 is aligned with a position where excavation is desired, and the verticality of the excavation axis 2 is adjusted in this state. Then, after the verticality is adjusted, excavation and agitation device 1 is excavated while rotating in the forward direction (in this embodiment, clockwise with respect to the traveling direction), and the solidified material slurry having a constant flow rate is discharged from the discharge port. Exhale from 23 and continue digging. At this time, the co-rotation preventing wing 5 receives resistance in the direction opposite to the excavation direction and generates friction between the annular body 51 and the packing 52 or the ring portion 22, and tries to generate co-rotation by this frictional resistance. Since the earth and sand and slurry come into contact with the lower inclined portion 54d and the outer inclined portion 54s of the blade body 50 of the co-rotation preventing blade 5, a force to rotate counterclockwise is generated. Thereby, the earth lump which could not be divided by the excavation blade 3 can be divided. Further, since the outermost side portion and the lower side portion 53d have acute angles, they do not receive a large resistance during excavation, and even if they receive a large resistance, the wing body 50 is moved in the vertical direction (that is, the resistance Because it is welded in the same direction as the receiving direction), it can withstand the large resistance. Thereby, even if it receives big resistance, the deformation | transformation of the wing | blade body 50 and the damage in a root part can be prevented.

  Then, the excavation proceeds in this way, and when the predetermined depth is reached, the excavation and the discharge of the solidified slurry are stopped, and this time, the excavator agitator 1 is pulled out while rotating in the reverse direction.

  At this time, the upper inclined portion 54 u and the outer inclined portion 54 s of the wing body 50 are in contact with the earth and sand or the solidified material slurry, thereby applying a rotational force in the direction opposite to the rotational direction of the excavation shaft 2. Thus, by suppressing the co-rotation of the co-rotation preventing blade 5, the soil block can be divided and the solidified material slurry can be stirred more strongly.

  Then, after the pulling and stirring operations are performed in this way, the excavating blade 3 is rotated in the forward direction again and digging in the excavating direction to stir the solidified material slurry and perform the redrawing and stirring. After that, the excavating and stirring device 1 is finally pulled out.

  As described above, according to the embodiment, the excavation shaft 2 having the discharge port 23 for discharging the solidified slurry in the vicinity of the lower end, and the excavation blade attached to the vicinity of the lower end of the excavation shaft 2 and rotating together with the excavation shaft 2. 3, a stirring blade 4 attached above the excavating blade 3 and rotating together with the excavating shaft 2, and provided between the stirring blade 4 and the excavating blade 3 and freely rotatable with respect to the excavating shaft 2 In the excavation and agitation device 1 provided with the co-rotation prevention blade 5 attached to the ring body 51, the co-rotation prevention blade 5 is rotatably attached to the excavation shaft 2, and the excavation shaft 2 is connected to the ring body 51. A wing body 50 that is attached so as to be parallel to the axial direction is provided, and the outer periphery of the wing body 50 freely rotates in the direction opposite to the stirring wing 4 by contacting the ground during excavation or extraction. Inclined part 5 u, 54d, since as provided 54s, it is possible to reduce the resistance applied during drilling or during withdrawal. In addition, even when pressure is applied in the vertical direction due to contact with the ground, since the wing body 50 is attached in the vertical direction along the pressure, the wing body 50 is detached from the root portion. Can be prevented. Furthermore, since the configuration is such that the inclined portions 54u, 54d and 54s are provided on the outer peripheral portion of the plane, the manufacture is facilitated, and the co-rotation preventing blade 5 can be rotated in the reverse direction with a simple configuration. It becomes like this.

  In addition, since the upper side 53u or the lower side 53d of the planar wing body 50 provided vertically is scraped to provide the inclined portions 54u, 54d, 54s, the inclined portions 54u, 54d, 54s are easily formed. be able to. In addition, such inclined portions 54u, 54d, and 54s can be provided for the co-rotation preventing wings currently on the market.

  Furthermore, since the outermost part of the planar wing body 50 provided in a vertical shape is also scraped off to form the inclined part 54s, the ground in the part projecting outward from the excavating wing 3 is also provided. It is possible to rotate in the direction opposite to the co-rotation while reducing the resistance of the portion in contact with.

  In addition, as shown in FIG. 5, such inclined portions 54u, 54d, 54s are fixedly attached to a flat wing body 50 provided in a vertical shape, and are currently distributed in the market. An inclined portion can be provided later with respect to the common rotation prevention wing 5. In addition, it is possible to provide durability by forming an inclined portion that is likely to be worn by contact with the ground with a member having different hardness.

  In addition, this invention is not limited to the said embodiment, It can implement in a various aspect.

  For example, in the above embodiment, the inclined surface 55 is provided so as to form a straight line, but the inclined portion may be provided so as to form a curved surface.

  Further, in the above embodiment, the co-rotation preventing wing 5 is configured by the rectangular plane wing body 50. However, the present invention is not limited to this, and the co-rotation prevention wing 5 is formed by an elliptical plane wing body. You may make it comprise. In this case, the upper inclined portion 54u, the lower inclined portion 54d, and the outer inclined portion 54s are provided on the outer peripheral portion without a boundary.

  Furthermore, in the said embodiment, although the number of the blade bodies 50 of the co-rotation prevention blade 5 is not limited, as long as it is two or more with respect to the annular body 51, what number may be sufficient.

  At this time, the length of the wing body 50 may be variously changed, and a wing body longer in the radial direction than the excavation wing 3 or a wing body shorter in the radial direction than the excavation wing 3 may be provided. Also good.

  Moreover, in the said embodiment, although the excavation blade 3 was rotated clockwise with respect to the advancing direction at the time of excavation, you may enable it to rotate the excavation blade 3 in the reverse direction. In this case, the inclined portion of the co-rotation preventing blade 5 is provided on the side opposite to the above-described direction.

The figure which shows the whole excavation stirring apparatus which shows one embodiment of this invention The perspective view which shows the lower end vicinity of the excavation stirring apparatus in the same form AA sectional view in FIG. BB sectional view in FIG. The figure which shows the structure of the co-rotation prevention wing | blade which shows other embodiment of this invention. Diagram showing general ground improvement process

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Excavation stirring apparatus 2 ... Excavation shaft 21 ... Hollow rod 22 ... Ring part 23 ... Discharge port 3 ... Excavation blade 31 ... Blade body 32 ... Excavation blade 4 ... stirring blade 41 ... blade body 5 ... co-rotation prevention blade 50 ... blade body 51 ... annular body 52 ... packing 53u ... upper side 53d ... lower side 531u ··· 531d ··· 531s · · · 54d · · · 54d · · · · · · ·

Claims (4)

Excavation shaft having a discharge port for discharging the solidified slurry in the vicinity of the lower end, an excavation blade attached near the lower end of the excavation shaft and rotating with the excavation shaft, and an excavation blade attached above the excavation blade and with the excavation shaft In a drilling and stirring device provided with a rotating stirring blade and a rotation preventing blade provided between the stirring blade and the drilling blade and rotatably attached to the drilling shaft, the common rotation prevention blade ,
An annular body that is rotatably attached to the excavation shaft, and a wing body that is attached to the annular body so as to be parallel to the axial direction of the excavation shaft are provided. Or the excavation stirring apparatus characterized by providing the inclination part which rotates freely in the reverse direction to a stirring blade by contacting with the ground at the time of extraction. The excavation and agitation device according to claim 1, wherein the inclined portion is formed by cutting an upper side portion or a lower side portion of a planar wing body provided vertically. The excavation stirring apparatus according to claim 1, wherein the inclined portion is formed by cutting an outermost portion of a planar wing body provided vertically. The excavation and agitation device according to claim 1, wherein the inclined portion is fixedly attached to a flat wing provided vertically.

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