JPH066862B2 - Drilling head used for earth auger equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a drilling head for use in an earth auger device.

[Conventional technology]

The drilling head 10 used for the conventional earth auger device is
As shown in FIG. 6, an excavating screw 13 is provided on a substantially columnar head body 12 having an engaging shaft 11 provided on an upper portion thereof, and a tip is provided with a bit made of tungsten steel or the like. The head body 12 has a claw 14 and a hole (not shown) for injecting cement milk is provided in the center of the head body 12.

Then, the excavation head 1 is attached to the tip of the rotary shaft (not shown).
0 was attached, a counterweight was placed on the uppermost part and rotated, the earth was excavated by the excavation claw 14 at the tip, and the soil was discharged to the upper part by the screw 13.

[Problems to be solved by the invention]

However, since the tip of the above-mentioned excavation head is flat, the excavation speed is extremely slow in the gravel layer, the cobblestone layer, and the bedrock layer having a high N value, and further, the abrasion and damage are great, and it takes a long time to repair. Since the counterweight (heavy weight of about 3 tons) is applied to the excavator body as described above, there is a problem that the resistance is large and the construction period is significantly long.

In addition, since a counterweight, which is a heavy load, is provided at the upper part, the stability is poor and there is a risk of breakage.

Therefore, in order to solve these problems, as shown in FIG. 5, the head main body 15 is formed into an inverted truncated cone shape, and a drilling claw 16 having a small drilling area is provided at the tip, and an expanding claw 17 that is opened outward by a spring is provided on the top. We have developed a drilling head 18 equipped with.

However, the hole to be excavated by the excavating head 18 has an inverted truncated cone shape, and the upper base material or the steel pipe 19 serving as the outer frame of the base material does not move to the lower part. Therefore, there was a problem that the strength of the foundation was reduced or extra concrete was needed to reinforce the foundation.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an excavating head having a short tip length, in which an upper steel pipe is smoothly inserted into the ground.

[Means for solving problems]

The excavating head used in the earth auger device according to the present invention which meets the above-mentioned object is provided with a pair of excavating claws at the tip thereof, and has an inverted umbrella-shaped head body having a cross-section angle of about 120 degrees, and an original head body. It is provided on the side circumference of the portion so as to be rotatable obliquely downward from the horizontal direction via a pin, and has an enlarged claw that is biased by a spring and projects in the horizontal direction.

[Action]

When using the excavating head used in the earth auger device according to the present invention, first, the excavating head having the inverted frustoconical head body having good excavating efficiency is used to excavate a foundation hole having a predetermined depth. After that, the head main body is once raised and replaced with the head main body according to the present invention, and when the head main body is inserted into the steel pipe and reaches the lower end of the steel pipe, the expansion head is opened by the spring. Here, by operating the excavator, the hole which has been excavated in the shape of an inverted truncated cone by the enlarged claw is gradually excavated, and the steel pipe descends accordingly, and it becomes possible to excavate to a predetermined depth.

Further, since the head body has an inverted umbrella shape and the excavation claw is provided at the tip, the center of the hole is reliably determined, and the bottom of the foundation hole is smoothly enlarged and excavated.

〔Example〕

Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

1 is a side view of the excavating head used in the earth auger device according to the embodiment of the present invention, FIG. 2 is a plan view taken along the line AA in FIG. 1, and FIG. 3 is shown in FIG. View B
FIG. 4 is an enlarged view of a part, and FIG. 4 is an overall side view of an excavating device equipped with an excavating head used in the earth auger device.

As shown in FIGS. 1 and 2, an excavating head 20 used in an earth auger device includes a head main body 21 and a pair of excavating claws 22 attached to a tip portion of the head main body 21.
And enlarged claws 23, 24, 25 mounted on the side circumference of the base of the head body 21, and a mounting head 26 on the upper side.

The head body 21 has a substantially inverted umbrella shape with a cross-section angle of 120 degrees, and is made of S45C or steel equivalent to this, cast steel, or stainless steel, and a drilling claw 22 is provided at the tip. . The excavating claw 22 has an excavating blade (bit,
The bite) 27 is fixed, and the ground is excavated by rotation, and the whole excavation center is determined.

On the other hand, the enlarged claws 23, 2 are provided on the head body 21.
4, 25 are attached via pins 28, 29, 30 rotatably in a diagonally lower direction from the horizontal direction, and the enlarged claw 23,
Bits 31, 32, and 33 made of tungsten steel are attached to the tips of the holes 24 and 25 to form excavating blades.

As shown in FIG. 3, the attachment of the enlarged claw 23 (similarly for 24 and 25) has a tension rod 36 which is pulled from the upper and lower portions by springs 34 and 35, respectively, and has stop plates at both ends, Always upper and lower springs 34, 35
The expansion claw 23 itself is biased by the horizontal direction, but when the tip of the expansion claw 23 is pushed downward, it is rotated against the springs 34 and 35, and the expansion claw 23 is stored obliquely downward. The structure is such that the entire radius of gyration can be reduced. Blind plugs 37 and 38 are provided on the upper and lower parts of the springs 34 and 35, respectively, and the internal plugs 37 and 38 can be removed to repair the inside if necessary.

Here, in the mounting structure of the enlarged claw, it is also possible to perform by a winding spring winding the pin,
The present invention is not limited by the structure of the spring that biases the enlarged pawl outward.

As shown in FIG. 2, the pins 28 to 30 are fitted into halves of bushings 39, 40 and 41 made of hardened steel and housed inside the head body 21, and the upper part is fixed by the mounting head 26. .

A mounting head 26 is mounted on the upper part of the head body 21, and the mounting head 26 is connected to the knock holes 42, 43, 44 shown in FIG. It is also designed to be firmly connected by the bolts that are installed.

An introduction hole 47 for injecting cement milk is formed in the central portion of the head body 21, and an outlet provided with a valve (not shown) formed on the side surface of the head body 21 is connected to the head body 21. Can be injected into.

Therefore, the drilling head 2 used for this earth auger device
When 0 is used, as shown in FIG. 4, the excavating head 20 used in the earth auger device is attached to the lower end of the rotating shaft of the screw 48. Here, 49 is a steady rest,
50 is an excavator, 51 is a main winding wire, 52 is a top sheave, 53 is a leader, 54 is a support, 55 is a secondary wire, 56 is a pendant wire, 57 is a primary wire, 58 Indicates a generator.

First, the head body shown in FIG. 5 is excavated to a predetermined depth by the inverted frustoconical excavating head 18, and then the excavating head is replaced and the excavating head 20 is used. As a result, when the excavation head 20 comes out from the lower end of the steel pipe, the expansion claws 23 to 25 open outward and the lower part of the steel pipe 19 is gradually excavated. The steel pipe 19 can be buried up to the position
Since a small number of holes are formed in the lower part of 9, there is no influence on the entire foundation, and even if it is filled with concrete, the amount thereof may be small.

And the excavation head 2 used for the earth auger device
When 0 is raised, the enlarged claws 23 to 25 are attached to the lower end of the steel pipe 19.
The tip of the blade hits against the spring and the enlarged claws 23 to 25
Rotates downward, is housed in the steel pipe 19, and rises.

As described above, since the sectional angle of the head main body 21 is 120 degrees, when the sectional angle is 140 degrees or more, for example, the sectional angle of the head main body 21 is too wide and the excavator 50.
Although the load on the excavator is extremely large and the excavation time is long, the load on the excavator 50 is relatively small, the excavation can be performed smoothly, and the excavation time can be shortened.

In addition, the enlarged claws 23 to 25, which are biased by the springs 34 and 35 and project in the horizontal direction, are slanted downward from the horizontal direction via the pins 28 to 30 on the side circumference of the base portion of the head body 21 instead of the front portion. Since it is provided so as to be rotatable in the direction, the excavation surface can be dug down better by the tip portion of the head body 21, and the enlargement of the excavated hole can be achieved by the enlargement claw 2 provided at this base portion.
3 to 25 can be performed without any trouble.

It should be noted that, in the above embodiment, the number of excavating claws does not limit the present invention, and the required number of excavating claws are provided according to the diameter of the excavating head.

Further, in the above embodiment, the inverted umbrella-shaped portion of the head main body is not provided with the excavation claws, but it is also possible to arrange the excavation claws at appropriate intervals or to plant them in this part. It can also be used as a drilling head for a trench.

Further, in the embodiment, the sectional angle of the head main body is 120 degrees, but it is not limited to this and may be about 120 degrees.

〔The invention's effect〕

In the excavating head used in the earth auger device according to the present invention, since the excavating claw is provided at the tip of the inverted umbrella-shaped head body having a low height, and the expanding claw is provided at the side, While deciding the center of the hole with the excavating claw, a hole of a certain size can be drilled with the expanding claw.

In particular, it has an excellent effect when the hole after the excavation is enlarged by using the excavating head having the inverted frustoconical head body with high excavation efficiency.

Moreover, since the angle of the head main body is approximately 120 degrees, the load on the excavator is relatively small, the excavation can be performed smoothly, and the excavation time can be shortened. Further, since an enlarged claw that is biased by a spring and protrudes in the horizontal direction is provided on the side periphery of the base portion of the head main body instead of the front portion so as to be rotatable obliquely downward from the horizontal direction via a pin, The excavation surface can be dug down favorably by the tip portion of the head body, and the excavation hole can be enlarged by the enlargement claw provided at the base portion without any trouble.

[Brief description of drawings]

FIG. 1 is a side view of an excavating head used in an earth auger device according to an embodiment of the present invention, FIG. 2 is a plan view taken along the line AA in FIG. 1, and FIG. Partial enlarged sectional view, FIG. 4 is an overall side view of the excavator equipped with the excavator head used in this earth auger device, and FIG. 5 is a side view of the excavator head whose head body has an inverted truncated cone shape. FIG. 6 is a side view of a drilling head according to a conventional example. [Explanation of reference numerals] 20 ... Excavation head used for earth auger device, 21
...... Head body, 22 …… Drilling claws, 23, 24, 25 ...
… Expansion claws, 26 …… Mounting heads, 27 …… Drilling blades, 2
8-30 ... pins, 31-33 ... bits, 34, 35
...... Spring, 36 ...... Tensing rod, 37,38 ...... blind plug, 39 to 41 ...... Bushing, 42 to 44 ...... knock hole, 45 ...... bolt hole, 47 ...... introduction hole, 48 ...... screw, 49 ... steady rest, 50 ... excavator, 51 ...
Main winding wire, 52 ... Top sheave, 53 ... Leader, 54 ... Post, 55 ... Secondary wire, 56 ... Pendant wire, 57 ... Primary wire, 58 ... Generator

Claims (1)

[Claims] 1. An inverted umbrella-shaped head body having a pair of excavating claws provided at its tip and having a cross-sectional angle of approximately 120 degrees, and a side periphery of a base portion of the head body, which is oblique from the horizontal direction via a pin. An excavating head for use in an earth auger device, which is rotatably provided in a downward direction and has an enlarged claw that is biased by a spring and projects in a horizontal direction.