JPH04202995A - Earth drill of kelly-box mount reinforcing type - Google Patents

Abstract

PURPOSE:To increase the rigidity of and prevent the deformation of a mount by providing a belt-like kelly-box mount, in which the middle part is bulged, on the upper end edge part of a drilling backet, and radially providing plural reinforcing rods between the mount and a kelly-box. CONSTITUTION:An earth drill is composed of a socket 2, cylindrical drilling backet 4, nail blades 5, and belt-like kelly-box mount 10. The kelly-box mount 10 is made to have a shape in which the middle part is convexedly bulged, and plural reinforcing rods 12 are radially fitted between the mount 10 and the upper end edge part of the cylindrical drilling backet 4. This can increase the rigidity of the mount 10, and also enhance drag against push-in force given to a center part of the mount 10, moreover preventing the deformation of the kelly-box mount 10.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an earth drill for vertically excavating the earth to form a circular pit, and particularly relates to an earth drill whose Kelly box mounting base has increased rigidity. .

[Conventional technology]

Generally, in order to drive concrete piles into the ground to support the foundations of buildings, circular pits are formed in advance using an earth drill.

The ground drills shown in FIG. 4 (side view), FIG. 5 (top view), and FIG. 6 (bottom view) are known as the above-mentioned earth drills.

That is, in FIGS. 4 to 6, in the earth drill, a cylindrical trilling bucket 4 is formed by a socket 2 into which the lower end of the Kelly bar 1 is fitted, and a pin 3 that fixes the Kelly bar 1 to the socket 2. The Kelly bar can be attached to the Kelly bar through the belt-shaped Kelly box mounting stand 10 that is suspended horizontally at the upper end opening.
As the Kelly bar 1 rotates by a power mechanism (not shown), the trilling bucket 4
It is also designed to be rotationally driven.

Reference numeral 2a indicates a flange portion of the socket 2, and the socket 2 is welded to the upper surface of the Kelly box mounting base 10 via the flange portion 2a.

Furthermore, a claw blade is provided on the lower surface of the trilling bucket 4. That is, a large number of claw blades 5 are arranged in a row on an opening/closing lid 7 that is pivotally attached to the lower end of the trilling bucket 4 via a hinge 6.

Then, the claw blade 5 is rotated by the rotation of the trilling bucket 4.
The excavated soil is guided by an inclined guide portion 8 along the edge of the hole formed in the opening/closing lid 7, and is stored in the trilling bucket 4 through the hole.

Further, at a level above the claw blade 5, a pair of side cutters are provided on the outer circumferential surface of the lower end of the trilling bucket 4 for cutting the inner peripheral surface of the shaft that is being excavated into the ground by the claw blade 5. 9.9 are provided in a protruding manner, and these side cutters 9.9 are mounted so as to face each other in the diametrical direction of the trilling bucket 4. The soil excavated by each side cutter 9 is also stored in the trilling bucket 4 through the side cutout hole 20.

By the way, in order to perform the above-mentioned excavation, rotational force and downward pushing force are applied to the drilling bucket 4 through the Kelly bar 1.

That is, the pushing force by the Kelly bar 1 is
The information is transmitted to the trilling bucket 4 via the flange portion 2a and the Kelly box mounting base lO, but the mounting point of the socket 2 is at the center of the Kelly box mounting base 10, whereas the mounting point of the trilling bucket 4 is at the Kelly box mounting base 10. Since the mounting points of the socket 2 on the Kelly box mounting base 10 and the mounting points of the trilling bucket 4 do not match, such as at both ends of the mounting base 10, the Kelly box mounting base 10 is There is a risk of it becoming curved.

To deal with this situation, Kelly box mounting stand 10
A reinforcing plate 11 parallel to both sides of the Kelly box mount 10 is attached between both ends of the central part of the IO and the inner circumferential surface of the trilling bucket 4. A plurality of reinforcing rods 12 are installed horizontally and radially between the opening edge and the opening edge.

In addition, when discharging the soil stored in the trilling bucket 4, the handle shaft 13a is rotated by rotating the handle 13 (see FIG. 4), and the handle shaft 13a is rotated.
(See FIG. 6) It is only necessary to align it with the engagement hole 14 in the opening/closing lid 7, and accordingly, the opening/closing lid 7 will open downward while pivoting via the hinge 6.

[Problem to be solved by the invention]

By the way, in recent years, earth drill machines have tended to become larger.
Along with this, the rotational torque of the trilling bucket has increased from 5.2 t-m to 9.3 t-m, and the pushing force has also increased.

Therefore, in the conventional structure as described above, there is a problem that the Kelly box mounting base cannot withstand high rotational torque or large pushing force and may be damaged.

The present invention is an attempt to solve these problems, and includes a kelly box that is hung horizontally at the upper end opening of the trilling bucket and has a socket in the center that can be connected to the lower end of the kelly bar. In an earth drill equipped with a base, a raised part is formed at the center of the Kelly box mounting base to increase the rigidity of the mounting base, and the center part of the mounting base and the upper opening edge of the trilling bucket are formed. By attaching a plurality of reinforcing rods radially interposed between the parts and the parts so as to be inclined downward from the center to the outer periphery, it is possible to resist the pushing force from the Kelly bar applied to the central part of the Kelly box mounting base. To provide an earth drill reinforced with a Kelly box mounting base, which has increased resistance and can withstand the large rotational torque and pushing force of an earth drill machine.

[Means for solving problems]

In order to achieve the above-mentioned object, the earth drill with reinforced Kelly box mounting base of the present invention has a cylindrical shape that is supported by the lower end of the Kelly bar and is rotatably driven and receives a pushing force from the Kelly bar. A trilling bucket, a claw blade attached to the lower surface of the trilling bucket, and a socket suspended horizontally in the upper opening of the trilling bucket and connected to the lower end of the Kelly bar in the center. A belt-shaped Kelly box mounting base and a plurality of reinforcing rods are installed radially between the center part of the Kelly box mounting base and the upper opening edge of the trilling bucket, and the center of the Kelly box mounting base is The reinforcing rod is formed in a raised part, and the reinforcing rod is disposed at a downward slope from the central part to the outer part.

[For production]

In the Kelly box mount reinforcing earth drill of the present invention described above, the raised portion formed in the center of the Kelly box mount serves to increase the rigidity of the Kelly box mount itself.

In addition, a plurality of reinforcing rods are provided between the center of the Kelly box mounting base and the upper opening edge of the trilling bucket, radially slanting downward from the center to the outside. It provides a tensioning action to counter the pushing force from the Kelly bar acting on the center of the mounting base.

〔Example〕

Below, a Kelly box mount reinforced earth drill as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a perspective view of its main parts, Fig. 2 is its top view, and Fig. 3 is its side. FIG.

In addition, in FIGS. 1 to 3, the same reference numerals as in FIGS. 4 to 6 indicate substantially the same members.

In the earth drill of this embodiment, the cylindrical trilling bucket 4 is connected to the upper end of the socket 2, into which the lower end of the Kelly bar 1 is fitted, and the hinge 3, which fixes the Kelly bar 1 to the socket 1-2. It is supported by the lower end of the Kelly bar 1 via a band-shaped Kelly box mounting base 1° suspended horizontally in the opening, and is configured to receive rotational torque and pushing force from the Kelly bar 1.

Reference numeral 2a indicates a 7-rung portion of the socket 2, and the 7-rung portion 2a is welded to the center of the upper surface of the Kelly box mounting base 10.

Then, the 7 rung portion 2a of the Kelly box mounting base 10
A raised portion 10a is formed in the central portion including the welded portion.

Since the central part of the Kelly box mounting base 10 is formed into a raised part 10a, a plurality of reinforcing rods installed radially between the central part and the upper opening edge of the trilling bucket 4 have , as shown in FIG. 1, it is arranged so as to be inclined downward from the center toward the outside.

Note that the reinforcing plate 11 attached between both sides of the central part of the Kelly box mount 10 and the inner peripheral surface of the trilling bucket 4 has a mounting point on the Kelly box mount 10 side that is similar to the conventional one. Although it is more expensive than the previous model, other aspects are the same as the conventional model.

Due to the above-mentioned configuration, that is, the configuration in which the protrusion 10 is formed in the central part of the Kelly box mount lO, which includes the welded portion of the 7 flange 2a of the socket 2, the rigidity of the Kelly box mount 10 itself is increased. So, socket 2
This means that the Kelly box mounting base can sufficiently withstand the large rotational torque and pushing force transmitted from the Kelly bar 1 through the Kelly bar 1.

Further, since a raised portion is formed at the center of the Kelly box mount 10, the ridge is radially mounted between the center of the Kelly box mount 10 and the upper opening edge of the trilling bucket 4. Since the plurality of reinforcing rods 12 are inclined downward from the center toward the outside, the center portion of the Kelly box mounting base 10 is deformed downward due to the (downward) pushing force applied to the center portion. It is possible to prevent the Kelly box mounting base from deforming when a large pushing force is applied.

〔Effect of the invention〕

As described above in detail, the Kelly box mount reinforced earth drill of the present invention provides the following effects and advantages.

(1) Due to the structure in which a raised part is formed in the central part of the Kelly box mount including the welded part of the socket, the rigidity of the Kelly box mount itself is increased, and the rigidity of the Kelly bar transmitted through the socket is large. The Kelly box mounting base will be able to withstand rotational torque and pushing force.

(2) As a raised part is formed in the center of the Kelly box mount, a plurality of Since the reinforcing rod slopes downward from the center to the outside, the resistance to the (downward) pushing force applied to the center of the Kelly box mount increases, causing a large pushing force to act. It can also prevent the Kelly box mounting base from deforming.

[Brief explanation of the drawing]

Figures 1 to 3 show a reinforced earth drill with a Kelly box mount as an embodiment of the present invention, with Figure 1 being a perspective view of its main parts, Figure 2 being a top view, and Figure 3 being a top view. 4 is a side sectional view thereof, and FIGS. 4 to 6 show a conventional earth drill. FIG. 4 is a side view, FIG. 5 is a top view, and FIG. 6 is a bottom view. 1...Kelly bar-12...socket, 2a...7
Lang part, 3... Pin, 4... Trilling bucket, 5... Claw blade, 6... Hinge, 7... Opening/closing lid, 9
...Side cutter, 10...Kelly box mounting base, log...ridge, 11...reinforcement plate, 12...
・Reinforcement rod, 13...handle. Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 2 Figure 3 Figure 4! ”]l Figure 5

Claims (1)

[Claims] In an earth drill, a cylindrical trilling bucket is supported by the lower end of a Kelly bar and is rotationally driven and receives a pushing force from the Kelly bar, a claw blade attached to the lower surface of the trilling bucket, and a trilling bucket. A belt-shaped Kelly box mount that is suspended horizontally at the top opening of the bucket and has a socket attached to the center that can be connected to the bottom end of the Kelly bar, and the center of the Kelly box mount and the top opening of the trilling bucket. A plurality of reinforcing rods are installed radially between the periphery, and the central part of the Kelly box mounting base is formed into a raised part, and the reinforcing rods extend downward from the center toward the outside. A reinforced earth drill with a Kelly box mounting base, which is characterized by being installed at an angle.