JP3586844B2 - Stirrer / mixer with widening bit - Google Patents

Description

[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a stirring and mixing device provided with a widening bit, which can be applied to a soil improvement method, a soil cement composite pile method, a tunnel receiving method, an anchor method, a mountain retaining method, and the like.
[0002]
[Prior art]
For example, when constructing a columnar body having different diameters by drilling and stirring while injecting a cement such as soil cement into the ground, a stirring and mixing device capable of adjusting the stirring diameter is used. This type of stirring and mixing device is provided with a stirring blade that can be expanded and contracted at the tip of a rotating shaft. As means for expanding and contracting the stirring blade, the rotating shaft is doubled, one end of the stirring blade is supported at the tip of the inner shaft, and the link between the free end of the stirring blade and the outer shaft is supported by a link material. 2. Description of the Related Art A pantograph system is known in which the amount of expansion and contraction of a stirring blade can be adjusted by relatively sliding a shaft and an outer shaft.
[0003]
[Problems to be solved by the invention]
To improve workability, it is desirable to apply a striking force to the rotating shaft.However, conventional stirring and mixing devices, including the pantograph method, close the stirring blade when applying a striking force to the rotating shaft, Since the pivot portion of the link is damaged, it is limited to only rotation, and it is pointed out that the construction efficiency is low. For this reason, not only does the work time become longer as the construction target ground becomes harder, but also the construction may be postponed on the target ground having extremely low drilling efficiency such as rock.
[0004]
[Object of the present invention]
The present invention has been made in view of the above points, and an object of the present invention is to provide a stirring and mixing device having a widening bit, which can improve drilling efficiency by adding a rotating force and a striking force. is there.
Still another object of the present invention is to provide a stirring and mixing device provided with a widening bit, which can be applied to a wide range of ground from soft ground to hard ground.
Further, another object of the present invention is to provide a stirring and mixing apparatus having a widening bit, which has a wide range of application to various methods.
[0005]
[Means for solving the problem]
That is, the present invention relates to a stirring and mixing apparatus for drilling a hole by applying rotation and impact to a rod. The outer pipe is slidably mounted on the rod, and the base end of the widening bit is rotatably supported on the distal end of the rod. In addition, there is provided a stirring and mixing device provided with a widening bit, wherein a rear end surface of the widening bit is fitted to a front end portion of the outer pipe and slidably supported.
Further, the present invention provides a stirring and mixing device for drilling by applying rotation and impact to a rod, wherein the outer pipe is slidably mounted on the rod, and the base end of the widening bit is rotatably supported at the distal end of the rod. A projection for transmitting the rotation of the rod to the outer pipe by allowing the rod and the outer pipe to slide relative to each other by fitting the rear end surface of the widening bit to the distal end of the outer pipe so as to be slidably supported. A stirring / mixing device provided with a widening bit, wherein a fittable groove is formed on each of sliding surfaces of a rod and an outer pipe.
Furthermore, the present invention is characterized in that, in any one of the stirring and mixing apparatuses described above, a slide device that slides the outer pipe with hydraulic pressure by obtaining a reaction force from the rod at a base end side of the rod and the outer pipe, This is a stirring and mixing device provided with a widening bit.
Further, according to the present invention, in any of the stirring and mixing apparatuses described above, an engaging portion is formed on a rear end surface of the widening bit, and the engaging portion can be fitted to a distal end portion of the outer pipe while preventing the engaging portion from being detached from the engaging portion. A stirrer / mixer equipped with a widening bit, wherein a mating groove is formed and a part of the engaging portion is supported in contact with the engaging groove.
Further, according to the present invention, in any of the stirring and mixing apparatuses described above, an engaging portion is formed on a rear end surface of the widening bit, and the engaging portion can be fitted to a distal end portion of the outer pipe while preventing the engaging portion from being detached from the engaging portion. A stirrer / mixer equipped with a widening bit, wherein a mating groove is formed and a part of the engaging portion is supported in contact with the engaging groove.
Further, in any one of the stirring and mixing devices described above, a sphere having a receiving surface formed by cutting a part is rotatably embedded in a groove bottom of the engaging groove of the outer pipe, and a receiving surface of the sphere is formed. A stirring and mixing device provided with a widening bit, characterized in that it is supported by being brought into contact with an engaging portion of the widening bit.
[0006]
Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0007]
<A> Overall Configuration FIG. 2 shows an example of a stirring and mixing apparatus. Reference numeral 10 denotes a hollow rod having a distal end bit 11 and an expandable / reducible widening bit 12 at the distal end. The base end of the rod 10 is inserted into and gripped by a known drilling device 20 so that the rod 10 is given both rotation and impact motion through the drilling device 20 and has a swivel at its tail end. 13 is mounted so that the binder 14 can be discharged from the tip bit 11 through the axis of the rod 10. The outer pipe 15 is slidably mounted on the rod 10, and a rotational force is transmitted to the outer pipe 15 via the rod 10 by a fitting structure described later. The plurality of widening bits 12 are configured to simultaneously expand and contract by a relative sliding operation of the outer pipe 15 and the rod 10. Hereinafter, the structure of each part will be described in detail.
[0008]
<B> Widening Bit As shown in FIG. 1, the widening bit 12 has a band shape, a group of drilling chips 12 b is implanted on a front end face 12 a, and an engaging portion for fitting with the outer pipe 15 is provided on a rear end face 12 c. 12d are formed continuously.
On the other hand, a substantially frusto-conical bracket 16 is integrally fixed to the distal end of the rod 10, and a plurality of grooves 16 a is formed in the peripheral surface of the bracket 16.
The base end of each widening bit 12 is rotatably supported by a support shaft 17 in each groove 16 a so as to be rotatable in the axial direction of the rod 10.
[0009]
The shaft support structure of the widening bit 12 is not limited to the support shaft 17. A spherical concave portion is formed on the bracket 16 side, and a spherical portion is formed on the base end side of the widening bit 12. The end sphere may be rotatably accommodated in the recess of the bracket 16 and attached. A group of chips 16b for excavating the diameter range of the bracket 16 is provided on the front surface and the outer peripheral surface of the bracket 16 (see FIGS. 1 and 5).
[0010]
<C> Support mechanism of widening bit The rear end face of the widening bit 12 rotatably supported by the front end of the rod 10 is slidably supported by the front end of the outer pipe 15.
That is, as shown in FIG. 1, the distal end portion of the outer pipe 15 is formed thickly in an abacus spherical shape, and the same number of engaging grooves 15c as the widening bit 12 are radially recessed in the inclined front surface 15b of the thickened portion. The engaging portion 12d formed on the rear end face 12c of the widening bit 12 is slidably fitted in each of the engaging grooves 15c in a state where the engaging portion 12d is prevented from being detached.
In the fitting structure between the widening bit 12 and the outer pipe 15, it is important that the engaging portion 12d is in contact with the bottom surface of the engaging groove 15c.
[0011]
FIGS. 4A and 4B show examples of the cross-sectional shape (circular and trapezoidal) of the engaging groove 15c and the engaging portion 12d fitted in the engaging groove 15c, but the shape is not limited to the illustrated shape.
[0012]
The rear end surface 12c of the widening bit 12 has a linear shape or a curved shape. If the rear end surface 12c is linear, each expansion amount of the widening bit 12 is constant in proportion to the sliding amount of the rod 10 and the outer pipe 15. However, when the shape of the rear end face 12c has a curved shape, each expansion amount of the widening bit 12 can be set gently, and the shape of the rear end face 12c of the widening bit 12 is desirably adopted in accordance with the diameter of expansion.
[0013]
<D> Rotation transmission mechanism of widening bit As shown in FIGS. 1 and 3, a plurality of ridges 10 a protrude from the outer peripheral surface of the rod 10 in the axial direction. A plurality of grooves 15a are formed along the groove, and each of the protrusions 10a is fitted into the groove 15a so as to allow the rotational force of the rod 10 to be transmitted to the outer pipe 15 while allowing axial sliding. Has become. Further, the members forming the protrusions 10a and the grooves 15a may be combined in the reverse manner.
[0014]
<E> Adjustment of the relative slide amount between the slide mechanism rod 10 and the outer pipe 15 can be achieved by, for example, a slide mechanism shown in FIGS.
[0015]
That is, as shown in FIG. 2, a sliding device 41 that slides under the control of the hydraulic unit 40 is interposed between each base end of the rod 10 and the outer pipe 15 and the drilling device 20. FIG. 6 shows an example of the slide device 41, which is constituted by a double cylinder structure in which a cylindrical casing 43 is externally mounted on a piston rod 42 having a hollow structure.
[0016]
The left end of the piston rod 42 is screwed to the rod 10, and the right end is screwed to the rod of the drilling device, so that the rotation and the impact force of the drilling device can be transmitted to the rod 10. An annular piston 44 extending in the circumferential direction and a plurality of ridges 45 extending in the axial direction are provided on the outer peripheral surface of the piston rod 42. The annular piston 44 is positioned in an annular space 46 formed between the casing 43 and the piston rod 42 to define a plurality of liquid chambers 46a and 46b in the annular space 46. A flow path is formed so that the liquid can be supplied to and discharged from the liquid chambers 46a and 46b. For example, the casing 43 (outer pipe 15) is moved relative to the piston rod 42 (rod 10) by supplying liquid to the liquid chamber 46a on the left side of the drawing. The casing 43 (outer pipe 15) moves forward (widening) with respect to the piston rod 42 (rod 10) by the liquid supply operation to the liquid chamber 46b on the right side of the drawing. The liquid is supplied to and discharged from each of the liquid chambers 46a and 46b by the oil shown in FIG. Unit 40 is adapted to control. When the widening bit 12 expands the wings, the pressure of the liquid in the liquid chamber 46b is maintained. The purpose of the pressure holding control is to make the outer pipe 15 follow the reciprocating motion of the rod 10 in the axial direction, and to prevent the outer pipe 15 from sliding carelessly and causing the blades to contract. Of course, such a slide mechanism is not limited to the mechanism using the hydraulic pressure described above.
[0017]
A groove 48 is formed in the inner peripheral surface of the casing 43 that covers the protrusion 45 in the axial direction, and the rotational force of the piston rod 42 is reduced by the fitting structure of the protrusion 45 and the groove 48. (Outer pipe 15).
In order to transmit the rotational force of the rod 10 to the outer pipe 15, the rod 10 has a distal end (a fitting structure formed by the ridge 10a and the groove 15a in FIG. 1) and a proximal end (a ridge 45 and a ridge 45 in FIG. 6). (Fitting structure of the groove 48), it is desirable that both are fitted, but one may be omitted.
[0018]
[Action]
Next, a method of using the stirring and mixing device will be described.
[0019]
<A> Construction of Column Improved Body In FIG. 2, when drilling is started by applying a rotational force and a striking force to the base end of the rod 10 while supplying the consolidated material 14, the fitting structure of the rod 10 and the outer pipe 15 causes The rotational force is transmitted to the outer pipe 15, and as a result, the widening bit 12 in the wing-shrinking state rotates together with the tip bit 11 to advance a small-diameter hole, and the widened bit 12 is discharged from the tip bit 11. 14 are stirred and mixed to construct a columnar improved body 30 having a small diameter in the ground.
[0020]
<B> When the outer pipe 15 is slid in the forward direction with respect to the rod 10 when the predetermined depth is reached, the outer pipe 15 pushes the rear end face of the widening bit 12 to expand all the widening bits 12 in the radially expanding direction at once. By winging, a large diameter columnar improvement body 30 is constructed. Therefore, the amount of wing expansion of the widening bit 12 can be adjusted by the relative sliding amount of the rod 10 and the outer pipe 15, so that the hole and the binder 14 can be stirred and mixed at an arbitrary diameter.
The striking force applied when the widening bit 12 expands the wing is received by the engaging groove 15c at the tip of the outer pipe 15 fitted to the engaging portion 12d of the widening bit 12, and the wing expanding state of the widening bit 12 is maintained. .
[0021]
Embodiment 2
7 and 8 show another embodiment in which the receiving efficiency of the widening bit 12 is increased.
In this embodiment, a partially cut sphere 15d is rotatably buried in the bottom surface of the engagement groove 15c for accommodating the engagement portion 12d of the widening bit 12, and the receiving surface 15e formed on the cut surface of the sphere 15d is widened. The structure is such that the receiving surface 15e of the sphere 15d can follow the angle change of the widening bit 12 by making contact with the engaging portion 12d of the bit 12.
[0022]
Embodiment 3
In the above embodiment, the case is described in which the shaft paths formed in the shaft cores of the rod 10 and the tip bit 11 are used only as the transport flow path of the solidifying material 14. However, these shaft paths are formed with a large diameter. In some cases, it is used as an insertion space for leaving a core material such as a reinforcing bar at the center of the improved columnar body 30 obtained by stirring and mixing the consolidated material and the earth and sand.
[0023]
Embodiment 4
An example of a method applicable to the stirring and mixing apparatus of the present invention will be described.
[0024]
{Circle around (1)} Tunnel head receiving method This method can be applied to a tunnel head receiving method in which the columnar improvement bodies 30 are arranged in line toward the tunnel face.
In this case, if the sectional diameter of the columnar improvement body 30 is gradually increased toward the deeper part of the face, the occurrence of an unimproved section can be avoided.
{Circle around (2)} Anchor method An anchor method in which a core such as a PC steel bar is positioned at the center of the columnar improved body 30 and the core is tensioned and fixed can be applied. In the case of the anchor method, when the columnar improvement body 30 is formed in a wedge-shaped or dumpling-shaped cross section, a greater anchor strength can be obtained.
(3) Soil construction method This method can be applied to an earth retaining method for laying soil by reinforcing a ground between the columnar improved bodies 30 by constructing a large number of horizontally oriented columnar improved bodies 30 apart from each other.
The above method is an example, and can be applied to many other methods.
[0025]
【The invention's effect】
Since the present invention has been described above, the following effects can be obtained.
<B> The drilling efficiency can be improved because the work can be performed by applying a striking force in addition to the rotational force.
<B> Applicable to a wide range of ground from soft ground to hard ground.
<C> Can be used in various construction methods and has a wide range of applications.
<D> The rear end face of the widening bit is supported by the front end of the outer pipe in contact with it, and no striking force acts on the shaft support of the widening bit. Don't worry.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a tip portion of a stirring and mixing device according to Example 1. FIG. 2 is an overall view of a stirring and mixing device. FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. 1. FIG. 6 is a vertical cross-sectional view of a slide device. FIG. Enlarged view of main parts

Claims (6)

In a stirring and mixing device that drills by applying rotation and impact to the rod,
The outer pipe is slidably mounted on the rod,
While the base end of the widening bit is pivotally supported on the distal end of the rod,
The rear end surface of the widening bit is slidably supported by fitting to the front end of the outer pipe,
A stirring and mixing device with a widening bit. In a stirring and mixing device that drills by applying rotation and impact to the rod,
The outer pipe is slidably mounted on the rod,
While the base end of the widening bit is pivotally supported on the distal end of the rod,
The rear end face of the widening bit is fitted to the front end of the outer pipe to be slidably supported,
A protrusion for transmitting the rotation of the rod to the outer pipe while allowing the rod and the outer pipe to slide with each other, and a groove that can be fitted to the protrusion are formed on the sliding surfaces of the rod and the outer pipe, respectively.
A stirring and mixing device with a widening bit. The slide device according to claim 1 or 2, wherein a slide device that obtains a reaction force from the rod and slides the outer pipe by hydraulic pressure is provided at a base end side of the rod and the outer pipe.
A stirring and mixing device with a widening bit. The engagement groove according to any one of claims 1 to 3, wherein an engagement portion is formed on a rear end surface of the widening bit, and the engagement groove can be fitted to a distal end portion of the outer pipe by preventing the engagement portion from being detached from the engagement portion. A stirring and mixing device provided with a widening bit, wherein a part of the engaging portion is supported in contact with the engaging groove. The engagement groove according to any one of claims 1 to 4, wherein an engagement portion is formed on a rear end surface of the widening bit, and the engagement groove can be fitted to the distal end portion of the outer pipe while preventing the engagement portion from being detached from the engagement portion. A stirring and mixing device provided with a widening bit, wherein a part of the engaging portion is supported in contact with the engaging groove. 6. The sphere having a receiving surface formed by cutting a part of the outer pipe in a rotatable manner in the bottom surface of the engaging groove of the outer pipe, the receiving surface of the sphere being in contact with the engaging portion of the widening bit. A stirring and mixing device provided with a widening bit, wherein the stirring and mixing device is supported.

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