JP2521533B2 - Excavator and stirrer with radial stirrer plate to roll the hole wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention, in order to improve the ground having a small bearing capacity, is a rolling method in which a mixture of a solidifying material and soil is pressure-bonded and filled to form a large number of protrusions. TECHNICAL FIELD The present invention relates to an excavation stirring device including a radial stirring plate that rolls a hole wall and can form a pressure wall solidified column.

[Prior Art] Conventionally, a device disclosed in Japanese Patent Publication No. 58-29374 has been known as a device for excavating and stirring a solidifying material and soil so as to prevent co-rotation.

Conventionally, a solidified columnar column has been generally used, and a solidified column having a large number of convex portions formed on the outer peripheral wall surface has not been known.

[Problems to be Solved by the Invention] In the device disclosed in Japanese Patent Publication No. 58-29374, both ends of the co-rotation preventive blade descend while scraping the hole wall to remove the soil containing the stirring blade and the solidifying material. Although it is designed to prevent co-rotation and achieve its purpose, this device engraves a weakened section in the hole wall, and if there is a small obstacle, it greatly disturbs the hole wall and If the hole wall support on one side of the wing tip of the anti-rotation blade collapses, the excavation axis is biased, which induces an incorrect circular drilling, and further disturbs the hole wall.

Further, since the conventional solidified column has a columnar shape, there is no effective friction surface with the hole wall, and there is a problem that a solidified column integrated with the ground cannot be obtained.

[Means for Solving the Problems] The present invention is to fix a plurality of excavation blades to a lower portion of an excavation shaft provided with a through hole for pumping a solidified material, and further, to a portion above the excavation blade. The vertical pillars are integrally connected and fixed to each outer side of the horizontal pillars having substantially the same length as the excavation blades, which are arranged at predetermined vertical intervals. At least three or more co-rotation preventing blades each having a plurality of rectangular voids are formed at regular intervals, and the bases of the horizontal columns are fixed to the excavation shaft. Each co-rotation prevention blade is supported by a bearing so as to be able to freely rotate independently of the excavation shaft, and the excavation shaft facing each of the gaps has an interval of 180 degrees. Each of the two stirring blades is vertically shorter than the horizontal column and is fixed vertically with a 90 ° phase difference. While fixing the radial stirring plate formed by horizontally arranging a plurality of rectangular stirring pieces on the lower surface of the blade, the stirring pieces of each stirring piece extending near the hole wall forming the radial stirring plate are fixed. The above-mentioned problems have been solved by adopting a means of projecting the outer end outward from the blade tip of the excavation blade.

[Operation] According to the present invention having the above-described configuration, the co-rotation preventing blade that freely rotates with respect to the excavation shaft reduces the flow velocity of the mixture of the solidifying material and the soil, so that the co-rotation of the mixture and the stirring blade is prevented. To be prevented.

Further, from the blade tip of the excavation blade, a rolling impeller is formed on the wall of the hole by a stirring impeller having the blade tip projecting outward, and the mixture is pressure-bonded and filled in the depression, and a large number of convex portions are formed on the outer periphery. Solidified pillars having are formed.

[Embodiment] An embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing a state in which the device of the present invention has been dug into soil, and a drive device 3 is fixedly connected to the upper end of an excavation shaft 2 having a through hole 1 in the shaft core.

The drive unit 3 is attached to a leader (not shown) and has a function of rotating, lowering and raising the excavation shaft 2 and a mixed liquid of powder solidifying material such as Portland cement or ground stabilizer and water. And a solidification material injection port 4 for receiving the solidification material continuously by a hose, and a rotary joint.

The lower end of the excavation shaft 2 is formed with a sharp conical tip blade 5 suitable for excavation of the construction ground, and a plurality of the conical tip blades 5 are provided at regular intervals on the circumferential side of the excavation shaft 2 above the conical tip blade 5. Excavation wing 6
However, for facilitating the excavation, it is attached at an angle of plow angle θ with respect to the rotation direction of the excavation shaft 2 so as to plow the construction ground surface. Further, a plurality of excavation claws 7 are provided on the lower end edge of each excavation blade 6 so as to project downward so that the excavation is performed by setting a claw on the earth and sand. And, although it is not particularly limited to the excavation shaft 2 which is the mounting portion of each excavation blade 6, preferably, a plurality of solidified material ejection ports 8 are provided near the back surface of each excavation blade 6,
The excavation shaft 2 communicates with the through hole 1 and opens.

By arranging the jet outlet 8 near the back surface of the excavation blade 6, when excavating earth and sand with the excavation blade 6, the back surface of the excavation blade 6 is hardly filled with earth and sand, and a space portion is formed. There is no possibility that the jet outlets 8 will be closed by the sediment, so that the solidifying material is vigorously jetted from each jet outlet 8 toward the excavated soil.

On the excavation shaft 2 above the excavation blade 6, the soil excavated by the excavation blade 6 and the solidified material ejected from the ejection port 8 are
In order to prevent efficient mixing and agitation of them with a stirring blade 14 which will be described later, they are arranged at a predetermined vertical interval and have substantially the same length as that of the excavating blade 6, and the middle. The vertical pillars 10 are integrally connected and fixed to the outer sides of the lower horizontal pillars 9a, 9b, 9c, respectively, and are formed to have a rectangular upper void portion 11a and a lower void portion 11b, respectively. -Shaped co-rotation prevention wing 12
Each of the upper, middle, and lower horizontal columns with a certain interval.
Each base of 9a, 9b, 9c is fixed to the excavation shaft 2 respectively,
The co-rotation preventing vanes 12 are supported by the middle and lower bearings 13a, 13b, 13c so that they can freely rotate independently of the excavation shaft 2.

The co-rotation preventing blades 12 require at least three co-rotation preventing blades 12 in order to maintain centripetality with respect to the excavation shaft 2. In the embodiment, the three co-rotation preventing blades 12 are used as a device. Has been done. Further, the number of the excavating blades 6 is also required to be 3 or more for the same reason as above, but in the embodiment, it is 4 from the viewpoint of excavation efficiency.
A single excavation blade 6 is installed.

Also, the upper, middle, and lower horizontal columns 9 of the co-rotation prevention wing 12
Upper and lower voids 11a, 1 surrounded by a, 9b, 9c and vertical column 10
The excavation shafts 2 facing 1b are spaced apart by 180 degrees from each other.
The individual stirring blades 14 are vertically fixed to each other in the upper and lower two stages with their phases being different by 90 degrees.

Since each of the stirring blades 14 rotates in the upper and lower voids 11a and 11b, the length thereof is set to the upper, middle and lower horizontal columns 9a, 9b and 9b.
It is necessary to make it shorter than c.

On the outer side of the lower surface of the lower horizontal column 9c of each of the co-rotation preventing blades 12, a stirring member 15 having a rectangular shape that stirs the solidifying material and the soil and rolls it to the hole wall to form a recess in the hole wall. , A plurality of radial stirring plates 16 arranged radially in a horizontal state are fixed, and among the stirring pieces 15 constituting the radial stirring plate 16, at least the outside of the stirring piece 15 extending toward the hole wall. Edge 15
a protrudes outward from the blade tip 6a of the excavation blade 6 and
The outer end 15a is brought into contact with the hole wall of the hole H drilled by the above-mentioned method to roll the hole wall to form the rolling recessed portion 17.

The radial stirring plate 16 is also the same as the co-rotation preventing blade 12,
In order to contact the hole wall of the hole H excavated by the excavation blade 6 and maintain centripetal properties, at least three radial stirring plates 16 are required. In the embodiment, three co-rotation prevention blades 12 are provided. Radial stirring plates 16 are provided one by one.

The outer end 15a of the stirring piece 15 extending toward the wall of the radial stirrer plate 16 that protrudes outward from the blade tip 6a of the excavation blade 6 is drilled by the excavation blade 6. Hole H
The outer end 15 of the stirring piece 15 of each radial stirring plate 16 is attached to the hole wall of
a acts as a compaction wheel that compacts and compacts a compaction recess 17 to press and fill a mixture of the solidifying material and soil into the compaction recess 17.

 Next, the operation of the embodiment of the present invention will be described.

When the driving device 3 is operated to rotate the excavation shaft 2 and the excavation is advanced to the construction ground surface with the conical tip 5 as the tip, the excavation shaft 2 is attached with a plow angle θ at an angle. The construction ground is plowed by the plurality of excavation blades 6 which are formed, and the excavation is erected to form a hole H to form a hole H, and is pumped from the driving device 3 through the through hole 1 of the excavation shaft 2. , Portland cement, or a solidifying material, which is a mixed liquid of powder solidifying material such as ground stabilizer, and water, is jetted from each jet port 8 and mixed with the soil excavated by the excavation blades 6 by stirring.

Then, in order to promote the stirring of the mixture of the solidifying material and the soil, in this embodiment, two stirring blades 14 are provided in each of the upper and lower two stages.
However, they are installed 90 degrees out of phase with each other, and the stirring blades 14 are rotated by being driven by the excavation shaft 2 to further stir the mixture. At this time, a co-rotation preventing blade 12 that prevents the stirring material 14 and the mixture from co-rotating to stir the solidifying material and the soil is provided so as to be freely rotatable with respect to the excavation shaft 2. Each of the stirring blades is
The fluid pressure of the mixture flowing in the hole H by 14 causes the co-rotation preventing blades 12 to rotate in the same direction, but the upper, middle, and lower horizontal columns 9a, 9b of the co-rotation preventing blades 12 are rotated. , 9c and the vertical column 10 and the radial stir plate 16 causes the mixture to resist, so that each co-rotation preventing blade 12 rotates at a speed lower than that of the mixture, thereby reducing the speed of the mixture. The mixture and the stirring blades 14 are prevented from rotating together to further promote the stirring of the solidifying material and the soil.

Then, according to the flow of the agitated mixture,
By rotating the co-rotation preventing blade 12 at a low speed, the outer end 15a of the stirring piece 15 located nearer to the hole wall among the stirring pieces 15 constituting each radial stirring plate 16 has a hole H. A large number of compaction recesses 17 are formed by crashing into the wall, and the compaction material and soil mixture are pressed and filled into the large number of compaction recesses 17.

Co-rotation prevention blade 12 with the radial stirring plate 16 fixed to the lower surface
Is formed so as to be freely rotatable with respect to the excavation shaft 2, the co-rotation prevention blade 12 and the radial stirring plate 16 do not act on the rotation of the excavation shaft 2 in a braking manner, and
And the stirring blade 14 rotates smoothly.

The shape of the hole wall of the hole H subjected to the rolling compaction is influenced by the soil quality, the relation of obstacles, etc., the descending speed of the excavation shaft 2, etc., and thus the rolling compaction is not always performed regularly. Almost no stirring pieces that make up each radial stirring plate 16
Outer end 15 of stirring piece 15 that is located closer to the hole wall
Since a protrudes outward from the blade tip 6a of each excavation blade 6, the hole wall is uniformly and sufficiently filled with the mixture of the solidifying material and the soil by the rolling pressure of irregularly graduated steps. ,
As shown in FIG. 1, the rolling is performed in a substantially spiral shape to form the rolling recess 17.

Then, when the excavation shaft 2 is rotated in the reverse direction after reaching the planned depth, a mixture in which the solidifying material and the soil are sufficiently kneaded,
The sloping back surface of each excavation blade 6 works in a compact manner to pull up the excavation shaft 2 while pressing it downward, thereby forming a solidified column 19 having a large number of convex portions 18 on the outer periphery as shown in FIG. It is formed and one construction is completed.

By forming a solidification column 19 having a large number of protrusions 18 protruding from the outer periphery, the large number of protrusions 18 serve as an effective friction surface with the hole wall, and a solidification column integrated with the ground is obtained. .

In addition, when the apparatus of the present invention is used as a leader by storing the apparatus perpendicularly to the construction ground and performing the construction, a solid column of a columnar shape is formed, and when the apparatus is held at an inclination, a solidified column of a columnar shape is formed.

As another embodiment of the device of the present invention, a co-rotation preventing blade 12 having a Y-shape having one square void portion of the co-rotation preventing blade 12 according to the ground surface is used, and the stirring blade is used. 14 may be fixed in one stage and fixed to the excavation shaft 2, or the co-rotation prevention wing
There may be three or more rectangular voids 12 and the stirring blades 14 may be provided in three or more stages.

EFFECTS OF THE INVENTION Since the present invention is as described above, since the co-rotation preventing blade is pressed by the flowing mixture and rotates in the forward direction at a lower speed than the mixture, the flow velocity of the mixture is also reduced, and the mixture and each of the mixture are reduced. Since the co-rotation impeller can prevent co-rotation and the co-rotation prevention blade has almost the same length as the excavation blade, the co-rotation prevention blade does not scrape the hole wall and does not disturb the hole wall. The excavation axis is not biased.

Further, since the co-rotation preventing blade having the radial stirring plate fixed to the lower surface is formed so as to be freely rotatable with respect to the excavation shaft, the co-rotation preventing blade and the radial stirring plate prevent the excavation shaft from rotating. The excavating blade and the stirring blade can smoothly rotate without affecting the.

Further, the solidified column formed with a large number of convex portions on the outer periphery, the convex portions are well pressure-bonded to the compacted concave portions formed by the compaction to form an efficient friction surface, and Since the contact area with the hole wall expands only partly, it is extremely excellent as a solidification column for the ground.

[Brief description of drawings]

FIG. 1 shows a construction state in one embodiment of the device of the present invention, a partially cutaway perspective view in which a mixture of solidifying material and soil is omitted, and FIG. 2 is a partially cutaway enlarged front view of the same part, Figure is bottom view, 4th
The figure is a partially cutaway perspective view showing a state after completion of construction. In the figure, 1 is a through hole, 2 is an excavation shaft, 3 is a drive device,
6 is an excavation blade, 6a is a tip of the excavation blade, 9a, 9b, 9c are horizontal columns,
10 is a vertical column, 11a and 11b are voids, 12 is a co-rotation prevention wing, 1
3a, 13b, 13c are bearings, 14 is a stirring blade, 15 is a stirring piece, 15a is an outer end of the stirring piece, 16 is a radial stirring plate, 17 is a rolling depression, 18 is a convex portion, and 19 is a solidifying column. .

Claims (1)

(57) [Claims] 1. A plurality of excavation blades are fixed to a lower portion of an excavation shaft having a through hole for pumping a solidified material, and a predetermined vertical interval is provided on the excavation shaft above the excavation blade. A plurality of horizontal voids having substantially the same length as the excavation blades are placed and vertically connected integrally to each outer side of the horizontal columns, and a plurality of rectangular voids are provided between the horizontal columns. At least three or more co-rotation preventing vanes formed by equipping each of them are spaced at regular intervals, and each base of each horizontal column is axially supported by each bearing fixed to each of the excavation shafts. The co-rotation preventive blade is provided so as to be able to freely rotate independently of the excavation shaft, and the excavation shaft facing each of the voids has two stirring blades each having an interval of 180 degrees. A plurality of squares are formed on the lower surface of each of the co-rotation preventing blades, which are vertically shorter than the horizontal column and 90 degrees out of phase with each other. While fixing the radial stirring plate formed by horizontally arranging the stirring pieces of the above, the outer end of each stirring piece extending toward the hole wall forming the radial stirring plate is connected to the blade of the excavating blade. An excavation and agitation device equipped with a radial agitation plate for rolling a hole wall, characterized in that it is projected outward from the end.