JP3096678B2 - Screw dropper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates Shi equipment overlooked soil to remove soil attached to the helical groove of the screw is withdrawn after drilling by the earth auger.

[0002]

2. Description of the Related Art Dirt is clogged in a groove of a screw of an earth auger pulled out after drilling, and the soil clogged in the groove is being pulled out or moving for the next drilling operation or the like. Therefore, there is a problem that the work is hindered due to partial dropping or scattering, or that the surrounding environment is adversely affected. As a countermeasure against such a fall of the soil, a cover device composed of a bellows is commercially available. In this device, the upper end of the bellows is used by supporting the drive unit, and when the auger is pulled out, the upper end of the bellows is raised, so that the entire screw that has come out above the ground is surrounded. Therefore, it is possible to cope with falling and scattering of soil. However, this cover device can be applied to an earth auger having a leader like a crawler crane, but cannot be applied to an earth auger used in a rough terrain crane without a leader since there is no leader. In earth augers used in rough terrain cranes, the work of dropping soil is performed at the position where the screw part comes out of the ground. In this operation, for example, the screw is gradually pulled out while rotating, and a small excavator is attached with a wire brush or the like, and is pressed into the groove of the rotating screw to remove it. If the soil is clayey,
Since a wire brush alone is not easy to drop, a rod or the like is often used together, but the amount of work of the hydraulic shovel is increased, and the work is considerably troublesome.

[0003]

The work of dropping the earth auger screw used in the above rough terrain crane has a problem that requires an extra machine, manpower, and a considerable amount of time, and is desired to be solved. The present invention aims to provide a equipment to be overlooked <br/> screw soil ground auger used in rough terrain cranes.

[0004]

Apparatus of the present invention, in order to solve the problems], when withdrawing the auger and drilled into the ground, the helical grooves of the screw leaving the drilling and middle giving vibration to the screw while rotating the screw to pull out the real way to the soil of the inner Ru to fall off
Applicable to the application.

[0005] In the above method, the soil held in the spiral groove of the screw coming out of the hole can be dropped by giving the screw vibration and rotation. That is, by giving vibration and rotation to the screw, the soil held in the spiral groove receives the vibration and the centrifugal force, so that the soil is more easily dropped. Vibration can be performed using a vibrator, so that no labor is required as in the case of using a conventional hydraulic excavator, and the equipment is inexpensive. In addition, since the rotation is provided by the drive unit of the earth auger, no special equipment is required. The vibration is given to the screw during the pulling out, so that the soil held in the spiral groove is dropped off at a time when it cannot be lifted from the ground surface too high. As a result, it is possible to prevent the soil from falling from a high place, so that the generation of dust is greatly reduced.

According to the present invention, there is provided an apparatus for dropping a screw, wherein a drive unit of the auger is provided with a vibrator for applying vibration to the screw in a direction perpendicular to the axis, wherein a shaft corresponding to a bottom of a spiral groove of the screw is provided. The outer peripheral portion is provided with protrusions at appropriate intervals along the direction of the spiral groove ( claim 1 ).

[0007] Vibration of the vibration motivation, the drive unit is vibrated, the vibration is vibrated screw transmitted to the screw, since the vibration direction is perpendicular to the axis direction of the screw, the soil attached to the shaft of the screw It may grant the direction of the acting force to be peeled from the shaft surface effectively. Also, when drilling
The screw removes the soil from the soil accumulated in the spiral groove.
Is pushed up along the spiral groove, so the soil is
Sliding on the inner surface of the spiral groove. Convex part provided at the bottom of the spiral groove
Is to temporarily slide the soil that is slipping around the outer circumference of the screw shaft.
Press and compress only the part protruding outward in the radial direction of
Therefore, the soil that has passed over the protruding part will peel off
Gap is formed, and the gap lasts for a certain period of time
To keep the state easy to peel. This allows the screw
Drop the soil held in the spiral groove after pulling it out of the hole.
And make it easier. When actually removing the soil,
Clew can be given rotation as well as vibration,
The soil held in the spiral groove of Clew can be dropped well.
Wear.

In the apparatus of the present invention, it is preferable that the convex portion has a shape in which the front portion in the screw rotation direction at the time of drilling rises relatively gently, and the rear portion drops more rapidly than the front portion. Claim 2 )

[0009] The configuration provided with the convex portion is a
The movement resistance of soil passing through the ditch increases,
In order not to stop the projection, the protrusion amount is too large
I can't, but the front has a relatively gently rising shape
The surface on the bottom side of the soil in the spiral groove is pressed by
The shape is smooth and the rear is slightly lowered
This ensures that if the soil is clayey,
And the gap tends to last longer.

[0010] In the apparatus of the present invention, according to claim 1 or claim
Item 2 In the screw dropping device, it is preferable that the vibrator is attached to a weight attachment portion or an attached weight ( Claim 3 ). The drive unit of the auger is attached so that a weight (counter weight) can be adjusted, and a vibrator can be attached to this attachment portion or the weight. This part is a position that does not interfere with the work, and the power supply is easy.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. The device used is such that a vibrator 4 is provided in a drive unit 2 of an earth auger 1 provided in a rough terrain crane, and a screw 3 is slightly modified. That is, the vibrator 4 may be a commercially available vibrator, the weight 12 or the weight attaching portion 11.
The screw 3 is composed of a shaft 13 and a spiral blade 14
The convex portions 17 are provided at appropriate intervals on the groove bottom (shaft surface) 15 of the spiral groove formed by the above. Reference numeral 16 denotes a groove side surface of the spiral groove. The weight mounting portion 11 is provided on both side surfaces of the main body of the drive unit 2, and the weight 12 is provided with an auxiliary weight mounting portion. For example, the vibrator 4 can be mounted on the auxiliary weight mounting portion as shown in the figure. it can. The vibration direction of the vibrator 4 is a direction perpendicular to the axis 13. An electric motor and a speed reducer are provided inside the main body of the drive unit 2 which is covered by the cover 10. The convex portion 17 is formed by welding a steel plate formed by bending to a groove bottom 15 formed on the outer peripheral surface of the shaft 13, and as shown in FIGS. 1 every 4 pitches of screw helix on the side
Similarly, one screw is provided for every four pitches on the rear side and one for every four pitches, and is provided over the entire length of the screw 3 in a positional relationship shifted by 1.5 pitches between the rear side and the front side. In the figure, reference numeral 25 denotes a hole. Further, as shown in FIGS. 1 (c) and 1 (d), the shape of the convex portion 17 is substantially triangular in cross section and is provided in a state where the top portion is most protruded. In the rotation direction, the front portion 19, which is the front surface, rises relatively slowly, and the rear portion 20, which is the rear surface, descends relatively sharply.

When the ground 27 is drilled by the earth auger, the soil excavated by the auger head (not shown) at the lower end of the screw 3 by the rotation of the screw 3 forms the shaft 13 and the spiral blade 14.
It is pushed up through the spiral groove formed by.
In other words, the volume of the excavated soil increases and the volume that the screw enters pushes up the spiral groove, so the excavated soil always moves upward through the spiral groove to the surface while drilling is in progress. When the convex portion 17 is intermittently present, the convex portion is pushed radially outward of the shaft 13 by the convex portion.
As shown in (d), a gap 21 is formed between the outer peripheral surface of the shaft and the inner peripheral surface of the helical soil behind the convex portion 17 by passing through the position of the convex portion 17, and the gap 21 is maintained for a certain period. I do. When the soil is viscous, the inner peripheral surface of the spiral soil is in a smooth state, and the gap 21 is surely formed and disappears continuously for a certain period. That is, since the soil in the spiral groove receives a pushing force from below, the gap 21 gradually disappears. However, since the convex portions 17 are provided at appropriate intervals, the gap 2
When 1 is formed, it disappears or approaches disappearance. By this operation, a state in which the soil moving in the spiral groove is not sufficiently adhered to the surface of the shaft 13 is obtained.

When the auger is pulled out after excavation of one pile hole, it is appropriately selected according to the state of dust generation. For example, when the auger is pulled out by about 1 to 2 m, the vibrator 4 is rotated while rotating the screw. When operated, even if the soil is clayey, the soil is easily separated from the surface of the shaft 13 due to the effect of the gap 21 provided by the convex portion 17 when moving in the spiral groove during drilling. The spiral soil is separated by vibration and centrifugal force and falls off. Since the vibration is in a direction perpendicular to the shaft 13, the vibration acts so as to expand the inner hole of the spiral formed by the soil. Receiving and falling off. In anticipation of the state of the falling off of the soil, pulling out by 1-2 m successively while repeating the rotation and the vibration is repeated to finish the drawing. The screw 3 pulled out in this manner has no massive soil attached in a state where it can easily fall off.

Therefore, the soil which falls off from the screw 3 when the auger after drilling is withdrawn is from a height of about 1 to 2 m from the ground, and this height can be adjusted arbitrarily to generate dust. It is possible to remove even if the soil is clayey and easily adheres to the screw, so the soil will fall off before the next drilling process starts There is no hindrance.

In the above-described embodiment, the operation is described as a combination of the vibration and the rotation. However, in some cases, for example, in the case of the soil having low adhesion and hardly forming a block, only the vibration is effective. Conversely, simply giving rotation cannot sufficiently remove the fine soil,
Vibration must be applied to prevent generation of dust.

[0016]

[Effect of the Invention] The invention of claim 1 can be carried to the earth auger to use rough terrain cranes without leader, equipment is inexpensive, the operation is easy than operating the conventional hydraulic excavator Therefore, there is an effect that equipment cost and labor can be reduced. In addition, since the soil held in the spiral groove of the screw is made to be easily dropped by being peeled several times, clay soil which is relatively hard to fall is easily dropped. The invention described in claim 2 has an effect that the falling off of clayey soil is further facilitated. The invention described in claim 3 has an effect that the vibrator can be easily provided at a position that hardly affects the drilling operation.

[Brief description of the drawings]

FIG. 1 shows an embodiment of an apparatus used in the method of the present invention, in which (a) is a front view showing a drilled state of an earth auger without a leader, and (b) is a partially enlarged screw of (a). FIG. 3C is a cross-sectional view taken along line AA of FIG. 3B, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Earth auger 2 Drive unit 3 Screw 4 Vibrator 10 Cover 11 Weight attachment part 12 Weight 13 Shaft 14 Spiral wing 15 Groove bottom 16 Groove side surface 17 Convex part 18 Rotation direction at the time of drilling 19 Front side of convex part 20 Convex part Back surface 21 Clearance 25 Drilling hole 26 Soil in spiral groove 27 Ground

Claims (3)

(57) [Claims] An auger drive unit, wherein a screw excavator is provided with a vibrator for applying vibration in a direction perpendicular to the axis to a screw, wherein a screw is formed around an outer peripheral portion of the shaft corresponding to a bottom of a spiral groove of the screw. An earth removal device for a screw, wherein projections are provided at appropriate intervals along a direction of a groove. 2. The screw dropping device according to claim 2, wherein the protrusion has a shape in which the front part in the screw rotation direction at the time of drilling rises relatively slowly and the rear part falls down more sharply than the front part. An earth removal device for a screw. 3. The screw dropping device according to claim 2, wherein the vibrator is attached to a weight attachment portion or an attached weight. .