JP2740770B2 - Excavation axis in ground excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the field of excavation and relates to an excavation shaft in a ground excavator.

[0002]

2. Description of the Related Art A conventional agitating blade in an excavating shaft of a ground excavator simply cuts up and down a soil mass, since a leading end of a cutting blade is straight, and agitates the soil mass. Is pushed into the inner wall of a borehole or hollow pile, and it is not possible to construct a pile or reinforcing core with a uniform cross section,
There is a problem such as run-out due to resistance at the time of the first movement of the stirring. Also,
The center deviation prevention device is positioned so that it can rotate around the rotation axis.
Guided through the buffer means to equal number of arms
The body is guided freely in and out, and the excavation shaft is dug in the guide body.
Guide support with a predetermined pressing force on the inner wall surface according to the size of the drill hole
And, although intended to prevent deformation breakage of the drilling shaft, predetermined
Resistance during excavation of the guide member in the pressing state of there was a question <br/> die becomes larger.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above,
Improving the stirring performance of the stirring blades , depending on the size of the borehole
The center deviation prevention device that holds the center of the excavation axis
An object of the present invention is to provide an excavation shaft for a ground excavator capable of reducing resistance .

[0004]

According to a first aspect of the present invention, there is provided a ground excavator having an excavating shaft, the excavating head being attached to a tip of a rotary shaft, and a center deviation preventing device mounted above the excavating head.
When, and a stirring blade is pivotally attached also at upward, the stirring
Excavating shaft in a ground excavator having a comb-shaped concave groove formed by both sides and a bottom edge at a predetermined angle with the edge over the entire length of the radial edge on the descending side of the vertical cross section of the wing. smell
And the stirring blades are tilted forward on both sides of the groove toward the edge.
It consists of standing cutters .

[0005] The excavation axis of the ground excavator of the second invention is as follows:
Drilling head that is mounted on the tip of a rotating shaft, and the drilling head
Center deviation prevention device mounted on the upper part of the
And a stirring blade being pivotally attached Te, vertical section descent of the stirring blade
Edge along the entire length of the radial edge on the side
The concave groove consisting of both side edges and the bottom edge of the angle of
In the excavation axis of the ground excavator consisting of
A cutting edge is formed on the bottom edge of the concave groove .

[0006] The excavation axis of the ground excavator of the third invention is as follows:
Center deviation preventing apparatus according to the first or second aspect of the invention is, times
The required number of protrusions are evenly extended to the required position of the spindle, and
A guide body is provided to the fixed arm via a buffer means.
Is guided freely, and the top and bottom of the guide body is excavated.
In the center deviation prevention device that extends from near the outside to inside ,
The front end of the guide is turned around an axis that is
Moving roller, with the outer circumference of the roller as an arc surface
Consists .

[0007]

[Effect] Each of the standing blades on both sides of the groove of the stirring blade is provided.
The cutter cuts the earth mass to the right and forms a cutting edge at the bottom edge
It is working to grain refining of the clods by cutting the clods up and down, the center's
The rollers of the anti-roller are designed to reduce the penetration resistance during excavation.
In, aims to unnecessary external force relief from the inner wall surface, a predetermined external force
Only smoothly to the buffer means .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment. As shown in FIG. 1, the stirring blade 1 extends along the entire length of the radial edge 2 on the descending side of the vertical cross section at right angles to the both edges 3. And bottom edge 4
Odor that the groove 5 formed by arranged in a comb-teeth shape consisting of
As shown in FIG. 2, a cutter 6 having a forwardly inclined posture toward the edge 2 is erected on the upper surface of both side edges 3 of the concave groove 5, and a cutting edge 7 is formed on the bottom edge 4. The displacement prevention device 12 is extended in a cross shape at a required position of the rotating shaft 8 so as to be rotatable .
One, to arm 13 formed by positioning the vertical direction, slow
The guide body 16 exits via a spring 17 as an impinging means.
Guide the guide body 16 so that it can be freely inserted
The inside of the excavation head extends from near the outside to inside
In the misalignment prevention device, the front end of the guide body 16 is moved in and out.
A roller 18 that rotates about an axis that is perpendicular to the horizontal.
Ri, the required gradients become the outer periphery of the roller 18 as a circular arc face and the drilling head 14, the radial edges of the blades 19 in the lowering side, for the mounting base 9 of the rotary shaft 8 and the long And the bits 20 are arranged along the inclined edge 10.

[0009] Incidentally, stirring blade 1 shown in FIG. 1 is a vertical cross-section
The upper edge and the radial edge 2 on the descending side are parallel
However , as shown in FIG. 3, the edge 2 is an inclined edge 10 having a required slope with a long base 9 attached to the rotating shaft 8, and both sides parallel to the outer peripheral edge 11 from the inclined edge 10. the groove 5 consisting of parallel bottom edge 4 which the edge 3 and the inclined edge 10 disposed in a comb-teeth shape, standing the cutter 6 of the inclined forward toward the inclined edge 10 on the upper surface of the opposite side edges 3, Cutting edge 7 formed on bottom edge 4
Is also proposed.

The excavating shaft a of the ground excavator thus constructed is used in a configuration as shown in FIG. 1, and the excavating head 14 has a bit 20 arranged on the inclined edge 10 so that a resistance at the time of initial excavation is controlled. Is reduced and the run-out is eliminated,
Stirring blade 1 of the groove 5 or the groove by the cutter 6 and the cutting edge 7 at 5 and grain refinement of clods can be achieved and monitor, which swings are eliminated by the resistance relaxation during tilting edge 10, stirred initial, In the center deviation prevention device 12, the roller 18
To reduce the entry resistance when entering , and as a buffer
Obstacles on the inner wall surface due to the spring 17
Impact relaxed by, eliminating unnecessary external force to the drilling axis a. It is practically selected to apply wax (such as gallium wax) as a release agent to the stirring blade 1, the center deviation prevention device 12, and the excavation head 14 to reduce the drip.

[0011]

As described above, according to the excavation shaft of the ground excavator of the present invention, the vibration of the excavation shaft at the time of the initial movement of the excavation is eliminated, and the vibration at the time of the initial movement of the stirring is also eliminated. While reducing resistance to the inner wall in the direction of excavation,
The life of the excavation shaft is extended by reducing unnecessary external force and the shaft center is maintained, and the peripheral surface of the pile and reinforcing core is strengthened by improving the stirring performance. No effect is achieved), such as improvement in building strength.

[Brief description of the drawings]

FIG. 1 is a front view of an excavation shaft a in a ground excavator according to the present invention.

FIG. 2 is a partial perspective view of the stirring blade in the present invention.

FIG. 3 is a partial perspective view of a stirring blade in another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stirrer blade 2 End edge 3 Side edge 4 Bottom edge 5 Concave groove 6 Cutter 7 Cutting blade 8 Rotating shaft 9 Mounting base 10 Inclined edge 11 Outer peripheral edge 12 Center deviation prevention device 13 Arm 14 Excavation head 16 Guide 17 Spring 18 Roller 19 Wing plate 20 bits a Excavation axis in ground excavator

Claims (3)

(57) [Claims] Has a 1. A drilling head is pivotally attached to the distal end of the rotary shaft, and the center deviation prevention device is JikuSo above the該掘cutting head, and a stirring blade is pivotally attached also at upward, the Stirring
Excavating shaft in a ground excavator having a comb-shaped concave groove formed by both sides and a bottom edge at a predetermined angle with the edge over the entire length of the radial edge on the descending side of the vertical cross section of the wing. smell
And the stirring blades are tilted forward on both sides of the groove toward the edge.
Excavation shaft in a ground excavator with a standing cutter . 2. A drilling head which is mounted on a tip of a rotating shaft.
And a center deviation prevention device axially mounted above the excavation head.
When, and a stirring blade is pivotally attached also at upward, the stirring
Over the entire radial edge on the downside of the vertical section of the wing
A groove formed by both sides and a bottom edge at a predetermined angle with the edge.
Excavation axle in a ground excavator arranged in a comb blade shape
And an excavating shaft in a ground excavator in which the stirring blade forms a cutting edge at the bottom edge of the groove . 3. The center deviation prevention device is positioned at a required position on the rotating shaft.
An arm that projects evenly to the required number and is rotatably positioned
The guide body is guided freely into and out of the
And the range of entry and exit of the vertex of the guide is from the vicinity of the outside of the excavation
The front end of the guide body
From a roller that rotates about an axis that is horizontally perpendicular to the
Made, the drilling axis in claim 1 or claim 2 Ground excavator according comprised an outer periphery of the roller as an arc surface.