JP2008127812A - Ground improvement device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground improvement device capable of efficiently agitating excavated soil and solidifying material by preventing a co-rotation by a simple structure. <P>SOLUTION: This ground improvement device comprises a hollow rod 1 having a discharge port 7 for the solidifying material at the end, an excavating blade 3 fitted near the end of the hollow rod 1 and rotated when the hollow rod 1 is rotated, agitating blades 5, 6 attached to the upper part of the excavating blade 3 and rotated with the hollow rod 1 is rotated, and a co-rotation prevention blade 4 attached between the excavating blade 3 and the agitating blade 4 rotatably relative to the hollow rod 1. The co-rotation prevention blade 4 is composed of projecting blades 4a, 4b longer in blade length than the excavating blade 3 and intermediate blades 4b, 4b shorter in blade length than the excavating blade 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a ground improvement device for creating an improved body on the ground by mechanically stirring excavated soil and solidified material in a borehole.

Conventionally, a hollow rod provided with a discharge port for a solidified material at the tip, a drilling blade attached near the tip of the hollow rod and rotating together with the hollow rod, and a rotary rod attached above the drilling blade and rotated together with the hollow rod There is known a ground improvement device including a stirring blade that performs rotation, and a co-rotation prevention blade between the excavation blade and the stirring blade.
However, the conventional ground improvement device has a problem that the excavated soil rotates with the agitating blades and the excavated soil and the solidified material are not sufficiently agitated although the anti-rotation blade is equipped. .

As a method for solving this problem, for example, a ground improvement device shown in Patent Document 1 is known.
This ground improvement device is provided with a steel pipe having the same diameter as the excavation diameter, separately from the excavation blade and the stirring blade, and this steel pipe can be attached to the hollow rod via a support arm and attached in a vertically constrained manner, It is characterized in that a hooking means for the original ground is provided on the outside of the steel pipe.
By configuring the ground improvement device in this way, the hooking means is hooked on the original ground, and even if the hollow rod rotates, the steel pipe does not rotate, so that the excavated soil and the solidified material can be agitated.
Japanese Patent No. 3608119

  However, in the ground improvement device provided with the steel pipe, it is necessary to provide support arms near the upper end and the lower end of the steel pipe and fix them to the hollow rod.

  Therefore, a modification such as changing the position of the agitating blade is necessary for a normal ground improvement device.

  Therefore, an object of the present invention is to provide a ground improvement device capable of preventing co-rotation with a simple structure and efficiently stirring excavated soil and solidified material.

  In order to achieve the above object, the ground improvement device of the present invention comprises a hollow rod provided with a discharge port for a solidified material at the tip, a drilling blade attached near the tip of the hollow rod and rotating together with the hollow rod, A ground improvement provided with a stirring blade attached above the excavating blade and rotating together with the hollow rod, and a co-rotation preventing blade rotatably attached to the hollow rod between the excavating blade and the stirring blade. In the apparatus, the co-rotation preventing wing includes a protruding wing having a longer blade length than the excavating blade and an intermediate blade having a shorter blade length than the excavating blade.

  Here, the co-rotation preventing wing can be constituted by a pair of the protruding wings facing each other with the hollow rod as an axis of symmetry, and a pair of the intermediate wings substantially orthogonal to the protruding wings.

  Further, the co-rotation preventing wing can be attached with a branch-shaped wing in the middle of at least one of the protruding wing and the intermediate wing.

  As described above, the ground improvement device of the present invention includes the co-rotation preventing wing configured by the protruding wing having a longer blade length than the excavating wing and the intermediate wing having a shorter blade length than the excavating wing.

  By making the blade length longer than that of the excavating blade, the projecting blade can be prevented from penetrating into the ground and rotating together with the excavating soil.

  Further, since the blade length of the intermediate blade is shorter than that of the excavating blade, the intermediate blade does not come into contact with the original ground that has not been excavated by the excavating blade, so that the resistance during insertion can be reduced.

  Furthermore, since the excavated soil is finely divided by both the projecting blade and the intermediate blade, the solidified material can be evenly diffused throughout the excavated soil, so that it can be efficiently stirred.

  In addition, by installing a pair of projecting wings facing each other with the hollow rod as the axis of symmetry and a pair of intermediate wings substantially orthogonal to the projecting wings, the projecting wings and the intermediate wings can be installed at equal intervals in the excavation hole. , Can be stirred efficiently.

  And excavation soil can be divided | segmented further finely by attaching a branch-like small blade | wing to the middle part of at least one of a protrusion blade | wing or an intermediate blade.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  First, the configuration of the ground improvement device will be described with reference to FIGS. 1 and 2.

  The ground improvement device includes a hollow rod 1, a tip bit 2 attached to the tip of the hollow rod 1, an excavation blade 3 projecting near the tip of the hollow rod 1, and a projection above the excavation blade 3. The lower stirring blade 5 rotating with the hollow rod 1, the upper stirring blade 6 protruding above the lower stirring blade and rotating with the hollow rod 1, and the hollow rod between the excavation blade 3 and the lower stirring blade 5 1 and a co-rotation preventing wing 4 that is rotatably attached to 1.

  This hollow rod 1 can be made into a length required for ground improvement by connecting a plurality of hollow rods 1,... In the axial direction.

  And the rotation drive device (not shown) is connected to the upper end vicinity of the connected hollow rod 1, .... By this rotational drive device, the hollow rod 1 rotates and is press-fitted into the ground.

  The connected hollow rods 1,... Are connected to a plant (not shown) at the upper end, and the solidified material C manufactured in the plant can be fed into the hollow portion of the hollow rod 1.

  Further, the connected hollow rods 1,... Have a discharge port 7 for the solidified material C in the vicinity of the lower end, and discharge the solidified material C fed from the plant to the hollow part from the discharge port 7. Can do.

  The tip bit 2 is formed so that the tip has a pointed shape, and is attached to the lower end of the hollow rod 1 so that the pointed portion faces downward.

  And since this front-end | tip bit 2 is being fixed to the hollow rod 1 of a lower end, it rotates and press-fits with rotation and press-fit of the hollow rod 1, and excavates the ground.

  The excavation blade 3 is composed of two blades 31, 31. The blades 31, 31 are hollow in the vicinity of the lower end of the hollow rod 1 and above the tip bit 2 so as to face each other with the hollow rod 1 as a symmetry axis. The rod 1 protrudes substantially perpendicular to the axial direction of the rod 1.

  The wing 31 is formed of a main body portion 31a projecting from the hollow rod 1 and downward excavation blades 31b projecting from the main body portion 31a.

  These downward digging blades 31b,... Are formed so that the thickness of the tip end portion of the plate-like member is reduced, and a plurality of the digging blades 31b are projected from the main body 31a.

  And since these two blades 31 and 31 are being fixed to the hollow rod 1, they are rotated and press-fitted together with the rotation and press-fitting of the hollow rod 1, and the excavating blades 31b,. Excavate the ground.

  Therefore, as shown in FIG. 2, the excavation line D is determined by the blade length of the blade 31, the soil inside the excavation line D becomes the excavation soil S, and the excavation soil S is mixed with the solidified material C. It becomes a ground improvement body.

  The lower stirring blade 5 is formed of two rectangular plate-like blades 5 a and 5 a having a length equivalent to the blade length of the excavation blade 3, and the two blades 5 a and 5 a are symmetrical to the hollow rod 1. Projecting substantially perpendicular to the axial direction of the hollow rod 1 above the excavating blade 3 so as to face each other as an axis.

  Since the blade surfaces of the blades 5a and 5a are installed with inclination from the horizontal plane, the excavated soil S can be agitated by rotating together with the hollow rod 1.

  The upper stirring blade 6 includes a cylindrical portion 6d, two rectangular plate-like blades 6a and 6a projecting from the cylindrical portion 6d, a stopper 6b on the lower side of the cylindrical portion 6d, and an upper side of the cylindrical portion 6d. And a clutch 6c that controls rotation, and is disposed above the lower stirring blade 5.

  The two blades 6a, 6a are projected substantially perpendicular to the cylindrical portion 6d so as to face each other with the hollow rod 1 as the axis of symmetry.

  Since the blade surfaces 6a and 6a are attached with the plate surfaces inclined from the horizontal plane, the excavated soil S can be agitated by rotating together with the hollow rod 1.

  Furthermore, since the blades 6a and 6a are formed to have a length equivalent to the blade length of the excavation blade 3, the resistance during insertion can be reduced.

  The cylindrical portion 6d has an inner diameter larger than the outer diameter of the hollow rod 1 and is formed so that its inner surface is in contact with the outer surface of the hollow rod 1, so that it is configured to be rotatable with respect to the hollow rod 1. The rotation is controlled by a clutch 6c provided on the upper side of the portion 6d.

  The cylindrical portion 6d is configured not to move in the axial direction of the hollow rod 1 by providing the clutch 6c on the upper side and the stopper 6b on the lower side.

  The clutch 6c is fixed to the hollow rod 1, and the rotation of the hollow rod 1 is transmitted to the cylindrical portion 6d and the blades 6a and 6a by the engagement of the convex portion of the clutch 6c and the concave portion of the cylindrical portion 6d. can do.

  And since the engagement position at the time of forward rotation and reverse rotation can be changed by making the width of the concave portion of the cylindrical portion 6d wider than the convex portion of this clutch 6c, the blades 6a, 6a at the time of forward rotation can be changed. The rotational trajectory and the rotational trajectory of the blades 6a and 6a during reverse rotation can be changed.

  Further, the lower stirring blade 5 and the upper stirring blade 6 can be efficiently stirred by being attached so as to be in a position rotated about 90 degrees with the hollow rod 1 as the rotation axis.

  And the ground improvement apparatus of this Embodiment is provided with the co-rotation prevention blade 4 between the excavation blade 3 and the lower stirring blade 5.

  As shown in the cross-sectional view of FIG. 3, the co-rotation preventing wing 4 is similar to the cylindrical portion 4c that is rotatable with respect to the hollow rod 1 and the protruding wings 4a and 4a that protrude from the cylindrical portion 4c. The intermediate wings 4b and 4b are provided so as to project from the cylindrical portion 4c, and the stoppers 4d and 4d are provided above and below the cylindrical portion 4c (see FIG. 1).

  The cylindrical portion 4 c has an inner diameter larger than the outer diameter of the hollow rod 1 and is formed so that its inner surface is in contact with the outer surface of the hollow rod 1, so that it is rotatable with respect to the hollow rod 1.

  Further, as shown in FIG. 1, stoppers 4d and 4d are provided on the upper side and the lower side of the cylindrical portion 4c so as not to move in the axial direction of the hollow rod 1.

  Further, the protruding wings 4a and 4a are formed in a rectangular plate shape, and their base end portions are attached to the cylindrical portion 4c so as to face each other with the hollow rod 1 as an axis of symmetry.

  The projecting wings 4a and 4a have a wing length longer than that of the excavating wing 3, so that the tip portion projects outward from the excavation line D and penetrates into the original ground during excavation.

  Furthermore, the projecting wings 4a, 4a are attached so that the plate surfaces are parallel to the penetration direction, so that the cross-sectional area in the penetration direction can be reduced and can easily penetrate the ground, and the rotation direction of the penetration portion can be reduced. Since the cross-sectional area increases and resistance increases, rotation becomes difficult.

  Similarly, the intermediate blades 4b and 4b are formed in a rectangular plate shape, and the base end portions are attached to the cylindrical portion 4c so as to face each other with the hollow rod 1 as an axis of symmetry.

  The intermediate blades 4b, 4b are prevented from projecting outside the excavation line D by making the blade length shorter than the excavation blade 3.

  The pair of protruding blades 4a and 4a and the pair of intermediate blades 4b and 4b are attached to the cylindrical portion 4c so as to be substantially orthogonal to each other, so that the four blades 4a, 4b, 4a and 4b are excavated. It is installed at equal intervals in the hole.

  The intermediate blades 4b and 4b are not limited to rectangular plate-like members, and materials and shapes are free as long as they have a certain degree of rigidity, such as plate-like members with rounded rectangular corners or rod-like members. Can be selected.

  Next, the effect | action of the ground improvement apparatus of this Embodiment is demonstrated, referring FIG. 2 and FIG.

  The ground improvement device of the present embodiment includes a co-rotation prevention blade 4 that is rotatably attached to the hollow rod 1 between the excavation blade 3 and the stirring blade 5.

  The co-rotation preventing wing 4 includes a cylindrical portion 4 c, a pair of projecting wings 4 a and 4 a having a blade length longer than that of the excavating blade 3, and a pair of intermediate blades 4 b and 4 b having a blade length shorter than that of the excavating blade 3. The

  For this reason, it is possible to prevent the co-rotation preventing blade 4 from rotating together with the excavated soil S during excavation.

  That is, when excavating viscous soil having a large adhesive force, the excavated soil S also rotates with the rotation of the lower agitating blade 5 and the upper agitating blade 6, and the co-rotation preventing blade 4 also rotates with the excavated soil S. And

  However, since the projecting wings 4a and 4a project outward from the excavation line D and penetrate into the original ground, a reaction force can be obtained from the original ground, so that the rotation of the co-rotation preventing wing 4 is suppressed.

  Further, since the intermediate blades 4b and 4b have a blade length shorter than that of the excavating blade 3, the resistance at the time of penetration is small.

  That is, the intermediate blades 4b and 4b are shorter than the excavating blade 3 and do not protrude outward from the excavation line D, so that they only pass through the already excavated area, so that the resistance during excavation is small.

  And the ground improvement apparatus of this Embodiment can stir the excavated soil S and the solidification material C efficiently by the protruding blades 4a and 4a and the intermediate blades 4b and 4b.

  That is, as shown in FIG. 4, first, the ground is excavated by the excavating blades 3 to generate excavated soil S1.

  The generated excavated soil S1 is moved upward relative to the ground improvement device by the ground improvement device being rotated and press-fitted into the original ground. It will pass through the stirring blade 5 and the upper stirring blade 6.

  At this time, the solidified material C is ejected from the discharge port 7 and mixed with the excavated soil S1.

  When the excavated soil S1 passes through the co-rotation preventing blade 4, the excavated soil S1 is divided into four by the four blades 4a, 4b, 4a, 4b to become excavated soil S2.

  Then, the excavated soil S2 is agitated by the lower agitating blades 5a and 5a and the upper agitating blades 6a and 6a to become the excavated soil S3.

  In this way, the excavated soils S2 and S3 are finely divided as compared with the conventional one by passing through the co-rotation preventing blade 4.

  Therefore, even when excavating viscous soil with high adhesive strength, the solidified material C can be evenly diffused throughout the excavated soil S without leaving a large clump of viscous soil, so that the ground can be improved efficiently. it can.

  In this case, by installing the projecting blades 4a and 4a and the intermediate blades 4b and 4b so as to be orthogonal to the projecting blades 4a and 4a, four blades are installed at equal intervals in the excavation hole, and the excavated soil S Can be divided into four substantially evenly. For this reason, the solidification material C can be spread | diffused uniformly and it can agitate with the excavation soil S efficiently.

  As described above, the co-rotation preventing blade 4 does not rotate together with the excavated soil S and the coagulation preventing blade 4 is used to uniformly diffuse the solidified material C throughout the excavated soil S, thereby preventing the occurrence of co-rotation. Thus, the excavated soil S and the solidified material C can be efficiently stirred.

  Hereinafter, a ground improvement device of a form different from the above embodiment will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the above-described embodiment, the ground improvement device including the co-rotation preventing wing 4 constituted by the protruding wings 4a, 4a and the intermediate wings 4b, 4b has been described. The ground improvement device provided with the joint rotation prevention wing 40 provided with the wing 8 will be described.

  As shown in FIG. 5, the co-rotation preventing wing 40 includes protruding wings 4 a and 4 a having a longer blade length than the excavating blade 3, intermediate blades 4 b and 4 b having a shorter blade length than the excavating blade 3, and the protruding blade 4 a, 4a and the intermediate blades 4b, 4b, and small blades 8 attached to the middle of the intermediate blades 4b, 4b, and is attached to a cylindrical portion 4c that is rotatable with respect to the hollow rod 1.

  The small blades 8,... Are formed in a rectangular plate shape, and are projected one by one on both sides of the protruding blades 4a, 4a and intermediate blades 4b, 4b.

  In this way, by providing the small blades 8,..., The excavated soil S1 can be divided more finely than when the excavated soil S1 is divided by the protruding blades 4a, 4a and the intermediate blades 4b, 4b. .

  Accordingly, the solidified material C can be evenly diffused throughout the excavated soil S, and even when excavating viscous soil with a large adhesive force, the ground is efficiently improved without leaving a large nodule of viscous soil. be able to.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  The preferred embodiments and examples of the present invention have been described in detail with reference to the drawings, but the specific configuration is not limited to the embodiments or examples and does not depart from the gist of the present invention. A degree of design change is included in the present invention.

  For example, in the above-described embodiments and examples, the case where the pair of opposed intermediate blades 4b and 4b are attached is shown, but the present invention is not limited to this, and two pairs of intermediate blades 4b, 4b, 4b and 4b are provided. May be attached, or an odd number of intermediate blades 4b,... May be attached.

  Moreover, in the said embodiment and Example, although the case where the length of intermediate blades 4b and 4b was equal was shown, it is not limited to this, The length of intermediate blades 4b and 4b may each differ. .

  Furthermore, in the said embodiment and Example, although the case where a pair of opposing protrusion wing | blade 4a, 4a was attached was shown, it is not limited to this, One protrusion wing | blade 4a may be sufficient and it opposes. A plurality of pairs of protruding wings 4a,... Or an odd number of protruding wings 4a,.

  And in the said Example, although the small blade 8, ... showed the case where one piece was attached to the both sides of the middle part of the protrusion blades 4a and 4a and the intermediate blades 4b and 4b, it was not limited to this. Instead, one piece may be attached to one side of the midway part of the protruding blades 4a, 4a or the intermediate blades 4b, 4b.

  Furthermore, in the said Example, although the small blade 8, ... showed the case where it attached to one place of the middle part of the protruding blades 4a and 4a and the intermediate blades 4b and 4b, it is not limited to this, You may attach to the projecting wings 4a and 4a or the intermediate blades 4b and 4b in the middle part.

It is a perspective view explaining the structure of the ground improvement apparatus of the best embodiment of this invention. It is explanatory drawing explaining the whole structure of the ground improvement apparatus of the best embodiment of this invention. It is sectional drawing seen in the AA arrow direction of FIG. It is explanatory drawing explaining the condition where excavated soil is divided | segmented and stirred by a ground improvement apparatus. It is sectional drawing of the ground improvement apparatus of the Example of this invention seen in the AA arrow direction of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hollow rod 3 Excavation blade 4,40 Corotation prevention blade 4a Projection blade 4b Intermediate blade 5 Lower stirring blade 6 Upper stirring blade 7 Discharge port 8 Small blade

Claims (3)

A hollow rod provided with a discharge port for a solidified material at the tip, a drilling blade attached near the tip of the hollow rod and rotating together with the hollow rod, and a stirring attached above the drilling blade and rotated together with the hollow rod A ground improvement device comprising a blade, and a co-rotation preventing blade rotatably attached to the hollow rod between the excavating blade and the stirring blade,
The ground rotation prevention device is constituted by a projecting wing having a blade length longer than that of the excavation blade and an intermediate blade having a blade length shorter than that of the excavation blade.   The said co-rotation prevention wing | blade is comprised by a pair of said protrusion wing | blade which opposes the said hollow rod as an axis of symmetry, and a pair of said intermediate wing | blade substantially orthogonal to this protrusion wing | blade. Ground improvement equipment. 3. The ground improvement device according to claim 1, wherein the co-rotation preventing wing has a branch-shaped wing attached to a middle portion of at least one of the protruding wing and the intermediate wing. 4. .

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